Selection of the VHF antenna is critical to achieving the optimum receive and transmit range. We would recommend choosing an antenna that is tuned to cover the AIS channels at 162MHz.
VHF radios operate at the other end of the marine band (156MHz), so for AIS as well via a splitter you will need to check that it performs across both frequency ranges.
Siting of an antenna is crucial as even a well suited antenna may not radiate a good signal if installed in a poor location. Put simply, keep the antenna upright, clear of anything that could touch it (rigging/other antennas etc), keep a reasonable distance from any other devices/antenna arrays like Radar/HF/VHF radio that may be operating at high power and also keep clear of any other metallic obstructions.
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