I would run the coax direct from the dish to the receiver and direct from there to the TV and get it working. Then experiment with other connections such as the sat/aux input. Find what works for sure even if you bring the coax in through a door or window and then play around.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof