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I assume that you have located the extra coaxial cable at main tv, have connected this to your sat receiver, and are not connected to the rv antenna booster circuit. Two other thoughts: could be that the satellite prep feed coax is damaged somewhere inside a wall, or the connection on outside of the trailer is mislabeled. Do you also have a second "cable in" connection on outside? Have you tried connecting dish to this one? Mislabeling is common thing on rvs.
Good luck
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