Magnet-mount antenna ??\'s Anyone know how a magnet-mount antenna is grounded? I run a Wilson 500 mag-mount. When I use it, I just slap it onto the center of my roof, under the assumption that ALL CB antennas need a good-sized ground plane to operate efficiently/correctly. BUT, the bottom of my ant. is plastic coated. Plastic being an insulator, how is this antenna getting grounded?? <font color=red>Click those banners and help support CK5!!<font color=black> Semper Maintenance!