A Class B AIS transponder requires a dedicated GPS antenna (all Class B units must have their own internal GPS and can't use an external feed for regulatory purposes) as well as a VHF antenna or suitable VHF-AIS antenna splitter. The GV30 is a combination VHF/AIS and GPS antenna with twin coax feeds. It is fitted with a standard 1" threaded base, so the antenna will mount onto a variety of deck, pole, and rail attachments. The 10m coax cables are terminated with FME mini connectors which makes running the cable easy since the connector is barely larger than the 5mm cable. Despite its compact dimensions, the GV30 offers very good performance as it is specifically tuned to 162MHz (AIS frequency). 7-1/2"H x 3" diameter. Features:• Specifically tuned to 162MHz• High gain GPS element• Supplied with 2 x 10m cable tails fitted with mini connectors for easy cable installation• Standard 1" threaded base for compatibility with a variety of mounts• Supplied with TNC (GPS) and BNC (AIS) adapters• Ideal for low-profile installations Mounts on a variety of decks, poles, and rails Ideal for low-profile installations | GV30 VHF/AIS/GPS Combo Antenna