My friend has called me to his ha shack in his house several times for antenna issues.
Our first step was to simply disconnect the antenna from the radio clean it and re-install it and in 99% of the cases the issue is gone.
This is is on antenna leads that don't get moved around.
It maybe just the vibration and moist conditions are causing a poor connection on the shield.
The PL-259 connector with the So-239 socket make a really a poor connection.
Try disconnecting, cleaning and reconnecting.
Might just work.
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