A quick way to eliminate a question of your coaxial wiring in the RV, is to run a coax cable from the back of your TV directly to the cable supply pedestal at your campsite. You can then go to setup on your TV, select cable input and scan for channels.
If you still are not receiving clear channels I would suspect you have a setting on your TV setup menu that isn't correct. If you do receive the channels reconnect the RV and see if it still works.
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