Have you checked the aerial cable? Try taking it apart, (assume you've got a PL259 type), rethread after cutting back a few inches of the cable in case you've had water ingress problems.
As VHF relies on co-ax, you can often get a cable issue with one side of the tx / rx process but not the other.
Failing that, connect an SWR meter in line and this will help you do some basic checks.
Simon
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