I don't know about Dish but with DirecTV you can't have anything between the LNB (on the sat dish) and the receiver. DirecTV calls the coax lead a "home run" which comes from the Romex house wiring (direct from the circuit breaker to the duplex wall receptacle - home run). On most coaches there is an amplifier circuit in the coax to power the external antenna and a splitter for the cable TV input. These circuit interrupters must be removed (or bypassed) for the receiver to communicate with the LNB and power the LNB.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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