Searching for a quality VHF/AIS combo antenna, Shakespeare 6500-WB found
A high-quality combination VHF and AIS antenna was on Gizmo’s shopping list this summer, even though I knew that it’s challenging to do both really well. The USCG Navigation Center spectrum diagram above tells the story (as does their detailed U.S. VHF Channel list): The marine VHF audio channels cluster around 157 MHz while the two main AIS channels are up at 162 MHz. That’s why dedicated VHF and AIS antennas are optimized differently…