VHF antenna
Connection to a suitable VHF antenna will be required for the transceiver to receive and transmit.
Transceiver variants (B921/B922/B951/B952) do not have an integrated splitter and will require a dedicated VHF antenna tuned to the AIS channels at 162MHz.
Integrated splitter variants (B923/B924/B953/B954) will require a VHF antenna tuned to operate across the frequency range 156MHz to 162MHz. That allows it to be compatible with both VHF radio (156MHz) and AIS (162MHz).
Figure 7 VHF antenna connector
The VHF antenna connector type is SO-239. It requires a PL-259 mating connector for the antenna.
For optimum performance the VHF antenna should be mounted as high as possible, and as far away as possible from metal structures, obstructions or sources of interference. If another transmitting antenna is installed on the same vessel we would recommend a separation distance of at least 3m where possible.