Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A possible future enhancement is to replace the tri-band with a triplexer and 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering if anyone has experience with these? Except for the 70cm (only $30 for an NMO mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 a piece, add in mounting hardware and I'm looking at $350-$400. They advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity without a ground plane. The big appeal is the size, only 3.5" tall. -- Trevor R.H. Clarke Computer Science House Rochester Institute of Technology retrev@csh.rit.edu http://www.csh.rit.edu/~retrev/

Do I understand that they say 3dBi omnidirectional gain or unity gain and only 3.5” tall? I guess I need that explained in more detail. Joe - WA8OGS > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list <mvus-list@lists.febo.com> wrote: > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > possible future enhancement is to replace the tri-band with a triplexer and > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering if > anyone has experience with these? Except for the 70cm (only $30 for an NMO > mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 a > piece, add in mounting hardware and I'm looking at $350-$400. They > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity > without a ground plane. The big appeal is the size, only 3.5" tall. > > -- > Trevor R.H. Clarke > Computer Science House > Rochester Institute of Technology > retrev@csh.rit.edu > http://www.csh.rit.edu/~retrev/ > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com

On Monday, August 24, 2020, 1:08:45 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote:  

Hi Joe     I bet that peak gain is NOT a zero degrees.                  At lobe at +30deg to the horizon may look good on an advertisement,                when you leave out the angle, but it doesn't help you talk to a repeater. 73 Kent WA5VJB On Monday, August 24, 2020, 1:08:45 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote: Do I understand that they say 3dBi omnidirectional gain or unity gain and only 3.5” tall? I guess I need that explained in more detail. Joe - WA8OGS > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list <mvus-list@lists.febo.com> wrote: > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > possible future enhancement is to replace the tri-band with a triplexer and > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering if > anyone has experience with these? Except for the 70cm (only $30 for an NMO > mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 a > piece, add in mounting hardware and I'm looking at $350-$400. They > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity > without a ground plane. The big appeal is the size, only 3.5" tall. > > -- > Trevor R.H. Clarke > Computer Science House > Rochester Institute of Technology > retrev@csh.rit.edu > http://www.csh.rit.edu/~retrev/ > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com _______________________________________________ mvus-list mailing list mvus-list@lists.febo.com http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com

I'm guessing it's not at the horizon but I can't track down an elevation radiation profile. Here's the product sheet for those interested https://www.talleycom.com/images/pdf/ANXTRAB4503P.pdf I assume it's some sort of fractal antenna design. On Mon, Aug 24, 2020 at 2:08 PM Joe via mvus-list <mvus-list@lists.febo.com> wrote: > Do I understand that they say 3dBi omnidirectional gain or unity gain and > only 3.5” tall? > I guess I need that explained in more detail. > > Joe - WA8OGS > > > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list < > mvus-list@lists.febo.com> wrote: > > > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > > possible future enhancement is to replace the tri-band with a triplexer > and > > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering > if > > anyone has experience with these? Except for the 70cm (only $30 for an > NMO > > mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 > a > > piece, add in mounting hardware and I'm looking at $350-$400. They > > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity > > without a ground plane. The big appeal is the size, only 3.5" tall. > > > > -- > > Trevor R.H. Clarke > > Computer Science House > > Rochester Institute of Technology > > retrev@csh.rit.edu > > http://www.csh.rit.edu/~retrev/ > > _______________________________________________ > > mvus-list mailing list > > mvus-list@lists.febo.com > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com > > > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com > -- Trevor R.H. Clarke Computer Science House Rochester Institute of Technology retrev@csh.rit.edu http://www.csh.rit.edu/~retrev/

Laird is commercial stuff; not going to be inexpensive. I am partial to Larsen, who makes good NMO mount antennas, except when they don't make a suitable mount, then I go with Diamond or Comet, in that order even though they are the same company. Tom Holmes, N8ZM -----Original Message----- From: mvus-list <mvus-list-bounces@lists.febo.com> On Behalf Of Trevor Clarke via mvus-list Sent: Monday, August 24, 2020 1:44 PM To: Midwest VHF/UHF Society Mailing List <mvus-list@lists.febo.com> Cc: Trevor Clarke <retrev@csh.rit.edu> Subject: [mvus-list] anyone use laird low profile antennas? Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A possible future enhancement is to replace the tri-band with a triplexer and 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering if anyone has experience with these? Except for the 70cm (only $30 for an NMO mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 a piece, add in mounting hardware and I'm looking at $350-$400. They advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity without a ground plane. The big appeal is the size, only 3.5" tall. -- Trevor R.H. Clarke Computer Science House Rochester Institute of Technology retrev@csh.rit.edu http://www.csh.rit.edu/~retrev/ _______________________________________________ mvus-list mailing list mvus-list@lists.febo.com http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com

I see from the catalog in Trevor’s followup email that the Phantom Elite utilizes dual polarization, with a height of only 3.5 inches for two meters. But I don’t see the width dimension. Wonder if it is some type of spiral or patch antenna, with loading/matching for reduced size. That would be interesting to see how it performed on a test range, or better yet, see the modeling pattern. It sure would not appear to be close to a 1/4 wavelength vertical in gain pattern. Joe - WA8OGS > On Aug 24, 2020, at 2:41 PM, KENT BRITAIN <wa5vjb@flash.net> wrote: > > Hi Joe I bet that peak gain is NOT a zero degrees. > At lobe at +30deg to the horizon may look good on an advertisement, > when you leave out the angle, but it doesn't help you talk to a repeater. > > 73 Kent WA5VJB > > On Monday, August 24, 2020, 1:08:45 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote: > > > Do I understand that they say 3dBi omnidirectional gain or unity gain and only 3.5” tall? > I guess I need that explained in more detail. > > Joe - WA8OGS > > > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list <mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com>> wrote: > > > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > > possible future enhancement is to replace the tri-band with a triplexer and > > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering if > > anyone has experience with these? Except for the 70cm (only $30 for an NMO > > mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 a > > piece, add in mounting hardware and I'm looking at $350-$400. They > > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity > > without a ground plane. The big appeal is the size, only 3.5" tall. > > > > -- > > Trevor R.H. Clarke > > Computer Science House > > Rochester Institute of Technology > > retrev@csh.rit.edu <mailto:retrev@csh.rit.edu> > > http://www.csh.rit.edu/~retrev/ <http://www.csh.rit.edu/~retrev/> > > _______________________________________________ > > mvus-list mailing list > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com <http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> > > > > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com <http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com>

On Monday, August 24, 2020, 11:45:08 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote:  

I have an antenna that was sent in for evaluation that ....."Splits the E and H field of the EM wave and propagates them    separately giving each signal diversity" Uhhhh .... an E field by itself, or the H field by itself doesn't propagate. Yes, with an EXTREME high Er dielectric you could make a patch antennathat small, but bandwidth would only be a few kHz......... I just might have to model that! Kent WA5VJB On Monday, August 24, 2020, 11:45:08 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote: I see from the catalog in Trevor’s followup email that the Phantom Elite utilizes dual polarization, with a height of only 3.5 inches for two meters. But I don’t see the width dimension. Wonder if it is some type of spiral or patch antenna, with loading/matching for reduced size. That would be interesting to see how it performed on a test range, or better yet, see the modeling pattern. It sure would not appear to be close to a 1/4 wavelength vertical in gain pattern. Joe - WA8OGS > On Aug 24, 2020, at 2:41 PM, KENT BRITAIN <wa5vjb@flash.net> wrote: > > Hi Joe    I bet that peak gain is NOT a zero degrees.  >                At lobe at +30deg to the horizon may look good on an advertisement, >                when you leave out the angle, but it doesn't help you talk to a repeater. > > 73 Kent WA5VJB > > On Monday, August 24, 2020, 1:08:45 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote: > > > Do I understand that they say 3dBi omnidirectional gain or unity gain and only 3.5” tall? > I guess I need that explained in more detail. > > Joe - WA8OGS > > > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list <mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com>> wrote: > > > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > > possible future enhancement is to replace the tri-band with a triplexer and > > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering if > > anyone has experience with these? Except for the 70cm (only $30 for an NMO > > mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 a > > piece, add in mounting hardware and I'm looking at $350-$400. They > > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity > > without a ground plane. The big appeal is the size, only 3.5" tall. > > > > -- > > Trevor R.H. Clarke > > Computer Science House > > Rochester Institute of Technology > > retrev@csh.rit.edu <mailto:retrev@csh.rit.edu> > > http://www.csh.rit.edu/~retrev/ <http://www.csh.rit.edu/~retrev/> > > _______________________________________________ > > mvus-list mailing list > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com <http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> > > > > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com <http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> _______________________________________________ mvus-list mailing list mvus-list@lists.febo.com http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com

 On Monday, August 24, 2020, 11:45:08 PM CDT, Joe via mvus-list <

            when you leave out the angle, but it doesn't help you

I noticed that bit of marketing gibberish too..luckily it's absent from the actual antenna data sheets. I become more curious about these antennas as they must be at least somewhat useful or they wouldn't likely sell many in the commercial world as it would mostly be radio companies buying and installing them in fleets and they'd likely see through the BS sooner rather than later. The TRA4103 and TRA4303 are in the 70cm band and run about $30. Next time there's a cal/measure event I might have to order one and see what it really does. On Tue, Aug 25, 2020 at 7:56 AM KENT BRITAIN via mvus-list < mvus-list@lists.febo.com> wrote: > I have an antenna that was sent in for evaluation that ....."Splits the E > and H field of the EM wave and propagates them > separately giving each signal diversity" > Uhhhh .... an E field by itself, or the H field by itself doesn't > propagate. > > Yes, with an EXTREME high Er dielectric you could make a patch antennathat > small, but bandwidth would only be a few kHz......... I just might have > to model that! > Kent WA5VJB > > > On Monday, August 24, 2020, 11:45:08 PM CDT, Joe via mvus-list < > mvus-list@lists.febo.com> wrote: > > I see from the catalog in Trevor’s followup email that the Phantom Elite > utilizes dual polarization, with a height of only 3.5 inches for two > meters. But I don’t see the width dimension. > Wonder if it is some type of spiral or patch antenna, with > loading/matching for reduced size. > > That would be interesting to see how it performed on a test range, or > better yet, see the modeling pattern. It sure would not appear to be close > to a 1/4 wavelength vertical in gain pattern. > > Joe - WA8OGS > > > On Aug 24, 2020, at 2:41 PM, KENT BRITAIN <wa5vjb@flash.net> wrote: > > > > Hi Joe I bet that peak gain is NOT a zero degrees. > > At lobe at +30deg to the horizon may look good on an > advertisement, > > when you leave out the angle, but it doesn't help you > talk to a repeater. > > > > 73 Kent WA5VJB > > > > On Monday, August 24, 2020, 1:08:45 PM CDT, Joe via mvus-list < > mvus-list@lists.febo.com> wrote: > > > > > > Do I understand that they say 3dBi omnidirectional gain or unity gain > and only 3.5” tall? > > I guess I need that explained in more detail. > > > > Joe - WA8OGS > > > > > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list < > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com>> wrote: > > > > > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > > > possible future enhancement is to replace the tri-band with a > triplexer and > > > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm > wondering if > > > anyone has experience with these? Except for the 70cm (only $30 for an > NMO > > > mount antenna) these are not terribly inexpensive...2m and 1.25m are > $80 a > > > piece, add in mounting hardware and I'm looking at $350-$400. They > > > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do > unity > > > without a ground plane. The big appeal is the size, only 3.5" tall. > > > > > > -- > > > Trevor R.H. Clarke > > > Computer Science House > > > Rochester Institute of Technology > > > retrev@csh.rit.edu <mailto:retrev@csh.rit.edu> > > > http://www.csh.rit.edu/~retrev/ <http://www.csh.rit.edu/~retrev/> > > > _______________________________________________ > > > mvus-list mailing list > > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com < > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> > > > > > > > > _______________________________________________ > > mvus-list mailing list > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com < > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> > > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com > > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com > -- Trevor R.H. Clarke Computer Science House Rochester Institute of Technology retrev@csh.rit.edu http://www.csh.rit.edu/~retrev/

 On Monday, August 24, 2020, 11:45:08 PM CDT, Joe via mvus-list <

            when you leave out the angle, but it doesn't help you

>From what I learned in antenna theory in school, an antenna whose height is very small compared to a quarter wave could not exhibit vertical directivity much different than a cardioid pattern. And, such an antenna would have to be resonant (if it's to be efficient), hence narrow band. But I hasten to point out that at 70 cm, 3.5 inches is already about 1/8 wave. I doubt that that is enough to materially affect the vertical radiation pattern, but then I'm not equipped to do any quantitative work in the area. There is also a thing called the "superdirective array" which can *theoretically* beat the rules relating antenna size to directivity. However, achieving even a minimal improvement apparently would require such heroic measures in terms of extremely low loss materials and excruciatingly tight control over the magnitudes and phases of the elements' currents as to make the whole idea quite infeasible in practice. See: https://www.sciencedirect.com/science/article/pii/S1631070516301566 I hope your math is better than mine! Dana On Tue, Aug 25, 2020 at 7:11 AM Trevor Clarke via mvus-list < mvus-list@lists.febo.com> wrote: > I noticed that bit of marketing gibberish too..luckily it's absent from the > actual antenna data sheets. I become more curious about these antennas as > they must be at least somewhat useful or they wouldn't likely sell many in > the commercial world as it would mostly be radio companies buying and > installing them in fleets and they'd likely see through the BS sooner > rather than later. > The TRA4103 and TRA4303 are in the 70cm band and run about $30. Next time > there's a cal/measure event I might have to order one and see what it > really does. > > On Tue, Aug 25, 2020 at 7:56 AM KENT BRITAIN via mvus-list < > mvus-list@lists.febo.com> wrote: > > > I have an antenna that was sent in for evaluation that ....."Splits the > E > > and H field of the EM wave and propagates them > > separately giving each signal diversity" > > Uhhhh .... an E field by itself, or the H field by itself doesn't > > propagate. > > > > Yes, with an EXTREME high Er dielectric you could make a patch > antennathat > > small, but bandwidth would only be a few kHz......... I just might have > > to model that! > > Kent WA5VJB > > > > > > On Monday, August 24, 2020, 11:45:08 PM CDT, Joe via mvus-list < > > mvus-list@lists.febo.com> wrote: > > > > I see from the catalog in Trevor’s followup email that the Phantom Elite > > utilizes dual polarization, with a height of only 3.5 inches for two > > meters. But I don’t see the width dimension. > > Wonder if it is some type of spiral or patch antenna, with > > loading/matching for reduced size. > > > > That would be interesting to see how it performed on a test range, or > > better yet, see the modeling pattern. It sure would not appear to be > close > > to a 1/4 wavelength vertical in gain pattern. > > > > Joe - WA8OGS > > > > > On Aug 24, 2020, at 2:41 PM, KENT BRITAIN <wa5vjb@flash.net> wrote: > > > > > > Hi Joe I bet that peak gain is NOT a zero degrees. > > > At lobe at +30deg to the horizon may look good on an > > advertisement, > > > when you leave out the angle, but it doesn't help you > > talk to a repeater. > > > > > > 73 Kent WA5VJB > > > > > > On Monday, August 24, 2020, 1:08:45 PM CDT, Joe via mvus-list < > > mvus-list@lists.febo.com> wrote: > > > > > > > > > Do I understand that they say 3dBi omnidirectional gain or unity gain > > and only 3.5” tall? > > > I guess I need that explained in more detail. > > > > > > Joe - WA8OGS > > > > > > > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list < > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com>> wrote: > > > > > > > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > > > > possible future enhancement is to replace the tri-band with a > > triplexer and > > > > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm > > wondering if > > > > anyone has experience with these? Except for the 70cm (only $30 for > an > > NMO > > > > mount antenna) these are not terribly inexpensive...2m and 1.25m are > > $80 a > > > > piece, add in mounting hardware and I'm looking at $350-$400. They > > > > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do > > unity > > > > without a ground plane. The big appeal is the size, only 3.5" tall. > > > > > > > > -- > > > > Trevor R.H. Clarke > > > > Computer Science House > > > > Rochester Institute of Technology > > > > retrev@csh.rit.edu <mailto:retrev@csh.rit.edu> > > > > http://www.csh.rit.edu/~retrev/ <http://www.csh.rit.edu/~retrev/> > > > > _______________________________________________ > > > > mvus-list mailing list > > > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > > > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com < > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> > > > > > > > > > > > > _______________________________________________ > > > mvus-list mailing list > > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com < > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> > > > > _______________________________________________ > > mvus-list mailing list > > mvus-list@lists.febo.com > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com > > > > _______________________________________________ > > mvus-list mailing list > > mvus-list@lists.febo.com > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com > > > > > -- > Trevor R.H. Clarke > Computer Science House > Rochester Institute of Technology > retrev@csh.rit.edu > http://www.csh.rit.edu/~retrev/ > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com >

On Tuesday, August 25, 2020, 7:56:44 AM EDT, KENT BRITAIN via mvus-list <mvus-list@lists.febo.com> wrote:  

Antennas that small are probably fractals. You don't see them in Amatuer use cuz it's a patented design and licensed almost exclusively to commercial manufacturers that can afford it. Supposedly wide band and a way to make antennas physically smaller. Cell phones use them to cover several bands with one antenna. Sam N8VES On Tuesday, August 25, 2020, 7:56:44 AM EDT, KENT BRITAIN via mvus-list <mvus-list@lists.febo.com> wrote: I have an antenna that was sent in for evaluation that ....."Splits the E and H field of the EM wave and propagates them    separately giving each signal diversity" Uhhhh .... an E field by itself, or the H field by itself doesn't propagate. Yes, with an EXTREME high Er dielectric you could make a patch antennathat small, but bandwidth would only be a few kHz......... I just might have to model that! Kent WA5VJB     On Monday, August 24, 2020, 11:45:08 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote:  I see from the catalog in Trevor’s followup email that the Phantom Elite utilizes dual polarization, with a height of only 3.5 inches for two meters. But I don’t see the width dimension. Wonder if it is some type of spiral or patch antenna, with loading/matching for reduced size. That would be interesting to see how it performed on a test range, or better yet, see the modeling pattern. It sure would not appear to be close to a 1/4 wavelength vertical in gain pattern. Joe - WA8OGS > On Aug 24, 2020, at 2:41 PM, KENT BRITAIN <wa5vjb@flash.net> wrote: > > Hi Joe    I bet that peak gain is NOT a zero degrees.  >                At lobe at +30deg to the horizon may look good on an advertisement, >                when you leave out the angle, but it doesn't help you talk to a repeater. > > 73 Kent WA5VJB > > On Monday, August 24, 2020, 1:08:45 PM CDT, Joe via mvus-list <mvus-list@lists.febo.com> wrote: > > > Do I understand that they say 3dBi omnidirectional gain or unity gain and only 3.5” tall? > I guess I need that explained in more detail. > > Joe - WA8OGS > > > On Aug 24, 2020, at 1:44 PM, Trevor Clarke via mvus-list <mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com>> wrote: > > > > Ended up getting a cobra tri-band (2/1.25/0.7) antenna for my car. A > > possible future enhancement is to replace the tri-band with a triplexer and > > 3 antennas. I'm looking at the Laird Phantom Omni line and I'm wondering if > > anyone has experience with these? Except for the 70cm (only $30 for an NMO > > mount antenna) these are not terribly inexpensive...2m and 1.25m are $80 a > > piece, add in mounting hardware and I'm looking at $350-$400. They > > advertise 3dBi omnidirectional with a ground plane. The 2/1.25m do unity > > without a ground plane. The big appeal is the size, only 3.5" tall. > > > > -- > > Trevor R.H. Clarke > > Computer Science House > > Rochester Institute of Technology > > retrev@csh.rit.edu <mailto:retrev@csh.rit.edu> > > http://www.csh.rit.edu/~retrev/ <http://www.csh.rit.edu/~retrev/> > > _______________________________________________ > > mvus-list mailing list > > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com <http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> > > > > _______________________________________________ > mvus-list mailing list > mvus-list@lists.febo.com <mailto:mvus-list@lists.febo.com> > http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com <http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com> _______________________________________________ mvus-list mailing list mvus-list@lists.febo.com http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com   _______________________________________________ mvus-list mailing list mvus-list@lists.febo.com http://lists.febo.com/mailman/listinfo/mvus-list_lists.febo.com