Garmin Accessories - External GPS/Iridium Antenna w/Adapter Cable, Montana 7xx

Use our external passive antenna/extension cable when you want to install an external GPS/Iridium antenna. Can be used on the exteriors of vehicles or buildings as antenna is magnetic. Antenna cable is 1.5 meters (4.9 ft) long; dongle, or adapter cable, is about 0.2 meters (8 in).