portable tv saitellite dish

How are you connecting the antenna to the receiver? Be sure you don't use any of the existing RV wiring until you get everything else working correctly. That means running the coax through a window or between the slide directly to the back of the receiver. You then have to get to the signal strength meters, ensure they are set to the correct satellite(s) and then get the pointing parameters for the antenna (azimuth and elevation). Be sure that the post the antenna sits on is perfectly plumb and level or none of the other pointing parameters will mean anything. Once you get the antenna pointed in the right direction you will see and hear the signal coming from the receiver. Tweak it just a bit left/right/up/down until you have a good strong signal and then lock the antenna down.