Dish satellite hookup via cable input on Travel Trailer

Had the same issue and performed this simple mod to our existing antenna amplifier. Our rig only had a single exterior coax input although our RV came satellite prepped from the factory. We always use our satellite since park cable tv can be quite inept, and already had all the parts laying around. About 15 minutes later we were good to go, that was eight years ago and never an issue with satellite signal reaching receiver.