Thor, but what do you want to know?
Generally you have an external input (Cable) and an Antenna line to the roof antenna. These, as well as all cables going to your TVs terminate at a combination power injector/input selector/distribution hub. The "Power" switch injects power to the TV antenna amplifier and selects the OTA antenna as the input when ON. When OFF it selects the cable input. The same input is sent as the output to all TVs.
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad