Jason,
Have you ever had cable working in your coach?
Couple of possible causes;
-your booster is set to antenna instead of cable. If it has no cable selection, turn it off.
-if you have a digital TV, you need to do an auto program to get the TV to recognize the channels. Most parks now have digital rather than analog cable signal.
-bad coax from the pedestal to coach or no signal at pedestal.
Steve