Sorry for the maybe the silly questions but sometimes when texting the intended meaning is sometimes misintupretted as something else, just like this statement
Anyway are you actually on cable as in you connect one end of the coaxial cable to say the pedestal and the other end to the trailer, if so maybe try powering the antenna amplifier off.
If you are receiving signals via the antenna make sure the antenna amplifier is ON.
If all that is good then maybe have another look and make sure ALL cables are connected and properly.
Final thought, if you are on actual cable maybe the campsite has a problem.
Odds are it will be a simple thing that your going to kick yourself over.