flyfishpa- we had the same problem and figured I would need a coax tester but first I checked under the coach and found that the cable from the front of the coach was connected to the cable coming from the place where the campground cable is plugged into the wall of the coach at the rear of the coach. When I unscrewed this connection I noticed that the copper wire was not sticking out of the connection very far . After I stripped the cover off of the copper a little further and reconnected with longer copper wire going into the connection the reception has been fine. As FW28z said some parks have good cable , some are very weak. I am curious as to your saying you don't have a switch box. Ours is in overhead cabinet above the kitchen area. Along with the antenna booster button there are three buttons for each tv - they are labled air, cable, and sat. As you know we turn off the booster , press the cable button for each tv, and do the cable channel search for each tv. Your problem is likely in the coax cable but it could be not switching each tv to cable if you can't find the switch box.
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Happy RVing !
Donnie & Becky
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