Not sure if anyone is interested but I would have loved to know this when planning to add satellite tv for my coach.
I know there are a few variations over time of how the wiring was done.
I have the black winegard wall plate on my front entry way control panel. Mine has just the push button switch for the 12v power to the king jack antenna on the roof. There are 3 coax cables connected on the back of the wall plate:
1. One goes to the roof mount king jack antenna. This is the one that 12v can be applied when the button is pushed.
2. One comes from the cable/satellite port on the outside of the coach.
3. The last one (I believe) goes to the front tv, rear tv and jack on outside where you can hang the tv on the wall.
I do not have the bunk over cab option. So I have the cabinets and little spot to the left of the tv for the receiver. In that spot the is a power outlet and 2 USB ports as well as a AV cable (3 jacks red white and yellow). The av cable goes into the wall and comes out and is connected to the front tv.
I also pulled the Jensen out to see what connections it had. It has an hdmi to the front tv for DVD play and an AV (3 jacks red white and yellow) to the rear tv for DVD play.
I bought a dish playmaker and a Wally to set up satellite tv. I was ok just having one tv. But it has both hdmi and AV outputs. So I figured I can probably pull off having both tv's served by one Wally. Obviously, they can not be on different channels.
So I pulled the winegard wall plate from the wall and disconnected the cable in from the outside cable/satellite input. I put a coax barrel connector on that line and ran a temporary coax to the Wally receiver. Then I pulled the AV cable from the back of the Jensen and connected it to the Wally AV out. And last ran an hdmi cable from Wally to front tv. So now everything works! Front tv has HD from receiver. Rear tv has satellite but not as good quality but good enough.
So to clean up my install I am going to change the winegard wall plate with the one that has the cable output on the front and will run a cable around the inside door frame.
The only thing I lose in this is being able to watch a DVD on the rear tv. No issue for me