Tram TRAM 1655 Pretuned GPS VHF 30-dB-Gain Marine or Base Rachet-Mount Antenna with RG58A/U Cable and BNC ConnectorTram TRAM 1655 Pretuned GPS VHF 30 dB Gain Marine or Base Rachet Mount Antenna with RG58A U Cable and BNC Connector Marine GPS antenna for use on boat or at base; Gain: 30 dB; 1 in. x 14 thread standard marine mounting; 23 ft. RG58A U coaxial cable with BNC male connector; Includes Tram #1631 ratchet mount; 8 in. tall;