You WILL have an antenna booster somewhere. It may be hidden in a cabinet somewhere or behind one of the tvs, my bedroom tv is connected directly to the booster. It looks like a cigarette lighter plug with a small button on the the plate, when you press the small button the small led light will either light up up or go off, on mine when it is lit green its "on".
You will need to find the booster as I stated that's a good place to start tracing cables. On mine the cable from the antenna to the booster is white, from the cable connection outside to the booster is gray if I recall & black from the booster to the splitter. All of the satellite cables are orange.
Here's what the booster looks like front & back (may be black)
As I mentioned the 3 connections on the back, 1 from antenns, 1 from cable outside & 3rd to the splitter.