This unit is designed for use with an AIS receiving only unit. A single VHF antenna is used simultaneously for VHF, AM/FM and AIS receiving. An ideal solution where there is a need to avoid multiple on board antenna and to simplify your marine electronics needs. The 5257-S enables boaters to operate VHF radios, AIS receivers and AM/FM radio simultaneously with one antenna without interfering with
VHF radio performance.
• Shakespeare part 5257-S