Fixed cable problem!
My cable hasn't worked right in my MH since day one and no, it's NOT the antenna booster switch, I already knew about that, LOL. I finally found the splitter behind the antenna booster, tucked inside the wall and all the connections were very loose. Even after tightening them, the picture would still come and go so I looked at the booster a little closer as when I would jiggle it, the picture would come in good. Seems when they mounted the plate to the wall the screw went all the way through the input cable, damaging it. Luckily, I have a cable making kit so I replaced the bad section and the picture comes in great now.
I just wanted to post my finding in case others have a similar issue as it will give them something else to consider. It saved me a ton of work as I was about ready to re-cable all three TV's which would have been a major pain!
Bill, Christine and Bella (Chihuahua, thinks she's a Rottweiler!)
2018 Thor Challenger 37YT