I see no one jumped in here so I'll try.
On the outside the jack with no lable is the cable TV input. It runs to where ever your antenna power control is,(in mine the bedroom). The power control panel has a push button switch, a 12 volt jack and a little green light and a TV jack on the front. Green light on, that jack and the main TV should be on the antenna... push the button... light goes out, they switch to cable.
Sat prep wire goes into the entertainment cabinet, where you presumeably locate a receiver. The unused coax feeds the bed room. So, if you want sat TV in the bedroom, you use a microwave splitter between the LNB and the receiver, the put a second receiver in the bed room, or just split the composite output of the first receiver and send it to the bedroom on that extra coax. In mine it comes out beside the TV shelf at the foot of the bed.
Hope this helps.
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