In conjunction with the USCG Automatic Identification System (AIS) requirements for commercial vessels, Digital Antenna offers this AIS antenna that meets the exacting AIS frequency requirements. Designed with a low 1.5: 1.0 SWR ratio from 159-162 MHz for use with AIS transceivers, Digital Antenna's 4.5dB gain AIS antenna offers unsurpassed durability and performance and is compatible with all AIS transponders. Eliminate soldering with the factory-attached GOLD mini-UHF female connector. It requires only a 3/8" hole for cable routing and makes connecting to the radio simple with the provided screw-on adapter. Assembled, tested, and tuned by hand for superior performance and reliability. Features:• Powerful brass radiators• Soldered connections• Power-directing ferrite choke bead• High-gloss urethane finish• 316 stainless steel ferrule• 4.5dB gain• Standard 1"-14 threaded base• Gold factory-attached mini-UHF female with mini-UHF male to UHF male (PL259) adapter• Includes 25' of low-loss, tinned-braid, foil-shielded, UV-stable RG-8X marine cable Stainless steel ferrule & soldered connections Tuned by hand for maximum performance | Digital Antenna 578-S 4' AIS Antenna in White