Coaches vary a lot. Ours has a connector in the electric cable bay that is used to connect to the park cable. I can connect the X2 that, go to the A/V distribution box (Box Of Many Buttons ie., BOMB) and select "cable" as the source to output to one of the TVs. Pick a TV that you want to use and input that to the receiver. When you push the button, the satellite signal goes to the receiver. Connect the HDMI cable to the TV.
Clear as mud far?
Big problem with all that is that some TVs are not near the BOMB or the receiver, so you have to run the HDMI around the room. I'm using a wireless HDMI set that takes care of that for me.
Don't use the OTA antenna as a source, because it has an amplifier in the line, and it's NOT bi-directional; the receiver can't talk to the dish, so it won't work.
Give it a try, it will work out, and keep in touch.
Tom & Jan ---- Westwing43
2005 NEWMAR KSDP 3910 NOW PULLING A 2014 CHEVY CAPTIVA