VHF and AIS are NOT interchangeable. The AIS frequency is slightly higher than VHF and also requires a low SWR rating of 1.5:1 across the entire frequency of 156-162 MHz. VHF will have a greater than 2:1 SWR rating at these frequencies and is not usable for AIS. AIS frequencies do not cover the lower VHF frequency range. An AIS antenna should not be used for VHF.