Edson Marine: GPS Mount with Light Extension Adapter (67400)
Tram AIS/VHF/GPS Combo Marine Antenna in the Mobile Audio department at Lowes.com
Source marine GPS Antenna NMEA0183 with output RS232, Baud rate 4800 on m.alibaba.com
Amazon.com: HYS Marine GPS Antenna IP65 Waterproof Antenna W/7M(22.96ft) RG58 Coaxial Cable SMA Male Connector with Marine ABS Mount Base : Electronics
Amazon.com: Othmro Marine GPS Antenna Waterproof Antenna 3M/9.84 ft Coaxial Cable Wire, with SMA Male External Navigation Receiver GPS Boat Antenna Compatible 1Pcs : Electronics
Garmin External GA29 Antenna
Replacing a defective GPS antenna - Digital Yacht News
Point-1 GPS Antenna and Heading Sensor | West Marine
External Marine GPS Antenna for Garmin Boat GPS GPSMAP with BNC Connector | eBay
Amazon.com: NEWASHAN External Marine GPS Antenna Aerial for Furuno GPA018 GP150 GP1850 Boat Ship Navigation Receiver Fishfinder Sounder 26ft Long Cable TNC Connector + BNC Adapter for All Marine GPS Device :