Gilsson High Performance External GPS Antenna (SMB-F 90 Degree Connector) for Magellan RoadMate 300, 500, 700, 760, Meridian Color GPS Receivers 16ft cable Amplified (active) GPS antenna to enhance and improve GPS signal reception. Built-in magnets for mounting on car rooftops or other metallic surfaces. Built-in permanent mounting holes for mounting on aircraft fuselage, boat surfaces or car/RV/SUV vehicle surfaces.