Well, could be your VHF too. There is no straight/obvious answer. You should approach the problem in parts, and I suggest going from down to top (your mast). First, check your antenna connection for some "resistive load", so in case your antenna circuit is open, you don't fry your VHF output, during the diagnose. Best would be a SWR, but a patch antenna would help you eliminate your radio guess, or bringing it to a friend's boat. Unfortunately, majority of problems in VHF resides on the top of your mast ....
Beneteau Oceanis 43
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