My Gulf Stream Class C has power amp with red LED light booster switch in bottom of cabinet just over the dinette. Loose in cabinet bottom behind it is a cable splitter that sends the off air antenna feed to both front and rear TV sets. Check that location for bad connection, bad splitter, or cable with a staple thru it. Sounds like rear TV is using the remaining cable as an antenna when home close to powerful stations, but not getting signal from rotating batwing antenna and booster amp when in remote areas.
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