Do what I did. Remove the screws from the coax plate and pull it out slowly, the internal cable wires are attached behind. You will see that this plate, with the 2 connectors and the 3" jumper, is a distribution point that in my case feeds another plate with a single connector and the other Tv's. In my case one to the bedroom and one to the basement. I disconnected the one to the basement and changed the splitter from 3 to 2 to prevent the Loss of signal, improving the signal to the bedroom. You will also see where the antenna cable is connected at the rear of the plate. The 3" jumper changes the path depending on if you are hooked to cable or using the antenna. The button only turns on the 12 v power to the antenna booster. If that button isn't on then you will not get a signal from the antenna. If you are hooked up to cable and the button is on it wil interfere with the signal.
Married To The Navigator
2005 Red GMC Duramax 4X4 HD Crew Cab
4" Magnaflow, Banks Air Intake
Firestone Ride Rite Air Springs