3' (0.9m) VHF/AIS marine band 3dB gain. Communication performance over VHF marine frequencies is optimized with the master craftsmanship of this Classic 5215 Squatty Body®, built with extra bandwidth for all popular AIS transceivers. The lightweight, low-profile, stainless steel VHF antenna stands at 3' tall and is designed for masthead mounting to enhance transmission quality.