My coach came for the factory with an A/B/C switch for input to the TV. It did not come with a sat option, just Ant, Cable, VCR.
So...... it could be you only have a 3 way input on your switcher and the sat ant installer disconnected the ant and put the sat input there. Find the inputs for the switcher and I suspect there is where you will find your ant cable floating loose.
I have one of these
for doing cable wiring and identifying leads.
If not in your wheelhouse you can always go back to the installer.