Many RV converter/chargers and battery maintainers are noisy (electrically) that maybe some thing you might want to try at home first even if you use a quiet supply for the radio you still might pickup noise from some switching supplies. My converter is noisy on the higher bands so if I'm plugged in I switch off the converter while I play radio and run on the battery till I'm done. I have used my screwdriver antenna still mounted on the truck with coax from the camper with reasonable results.
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