If you have a rock wood A Frame camper . A few things.
The cable hookup is for cable coax or a digital television antenna.
It will not work with a satellite dish without a converter box inside the camper before you hook to the television.
Also, a regular non-digital television antenna (analog) will not work as nothing is broadcast in analog anymore and your flat screen will not tune it.
Make sure the flat screen in the camper has the right source selected (because it probably has more sources) If the wrong source is selected on the television, you won't get anything.
Have you verified the televisio works and can receive signals?
Work the problem backwards and eliminate possible problems as you go.
Lastly, I can't remember if the cable from the outside of the a frame to the inside connector is one piece of coaxial cable or if it's spliced at some point... It might be prudent trying to check that out too, once you've confirmed that the antenna works directly connected to the tv with a separate piece of coaxial cable.
Again, if it is a direct tv satellite dish you are connecting, I don't think that's going to work without the accompanying box and probably a subscription and some help pointing that dish I the right direction.