Here in Florida, I would recommend ANY external antenna or other roof mounted device be bonded to the building ground system conductor. See NEC and check Polyphazer's website for guidance. Polyphazer makes devices to protect GPS equipment as does Huber and Suhner. Be sure the device is rated to 2 GHz and that it passes through the bias voltage for the LNA. Also be aware that the ground rods installed at a residence will corrode away over time, It is good insurance to install and bond (to the main grounding conductor and rod), supplemental rods around the structure where the antenna enters. > -----Original Message----- > From:time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On > Behalf Of Chris Albertson > Sent: Thursday, December 30, 2010 6:26 PM > To: Discussion of precise time and frequency measurement > Subject: [time-nuts] GPS Antenna > > A few questions about GPS antenna.... > > > > > 3) Do people really run coax straight from a GPS antenna into their > house with no protection from lightening? Maybe a GPS antenna is a > small target compared to a 100 foot wire antenna in Florida > -- Joe Leikhim President Leikhim and Associates Oviedo Florida 407-982-0446 jleikhim@leikhim.com www.leikhim.com