Hi Jamie,
If there are TVs at each location, or you bring a digital TV with you, you can watch local stations to verify the antenna, signal booster, and Cable/Antenna wiring to each location.
To verify the cable input, you'd need something like an older piece of video equipment (like a VCR) that has a coax output. Connect it to the cable TV input, set the output to channel 3 or 4, and you should be able to pick it up at the TV (with signal booster OFF), on channel 3 or 4. You could use the same setup to test the satellite inputs.