You have tried taking the television into the house to see how it functions, can you now take one from the house (that you know works well) and put it in the camper and plug in the antenna and see how it functions? If it fails in the camper, then there's something going on with the wiring in the camper. If it run just fine, you know the problem is the television and not the camper.
Considering you took the television in the house and it did not function up to your expectations, chances are something could be wrong with the television.
We swapped out the television in our camper. It was mounted in one of those cabinets that raise and lower. The stations would come in sometime and sometimes not.
We finally figured it out. The coax cable connection on the back of the television was loose. No way to fix it unless we pulled the back of the television off, and I'm no TV repair man (my dad was, but I'm not!). Turns out, the constant bouncing of the trailer, causing the coax cable to bounce on the plug on the back of the television ended up damaging the connection.
We put the television in the house, on the wall in our bedroom and it works great there. I wiggled the wire to get a good over-the-air connection and never touched it again. Meanwhile, the new television in the camper is removed when in transport, and the cables are all disconnected.
Anyway, try it. Bring a known good television into the camper and see how it works. They will immediately eliminate television problem or camper problem.
