You probably won't find a schematic. This may help.
There is probably also a Satellite dish connection point on the outside of your RV which will just be a direct connection to a Sat. connector on the inside of your RV. (They seem to often swap one end or the other of the Sat & Cable wires so if something isn't working, look at the wire colors to see if they did that.)
In case you don't know, Antenna Booster Control Off (no light), Cable-In is connected to the TVs. Booster On: Antenna connected to TVs.