I took bought a new cable connector and drilled separate hole in plate for that connector then screwed the cable intended for cable use into new connector. I can use my directv dish or cable on the new connector. The boost amplifier will not allow satellite signal through. I prefer my dish over most cable companies plus I camp mostly in state and national parks where cable is not available.
Would suspect that an outside or basement connection marked "Sat" would have the dish connected to it and the other end of that line would go to the satellite receiver. The receiver's output needs to go to the TV's. Look for a place with two antenna cable connections near each other and jumpered. That would be where the satellite receiver goes. Open the jumper so line from outside goes into the receiver and the other gets the receiver output. With the jumper inplace, that "Sat" connection outside could feed a cable signal straight to the main TV.