If this is a tube TV then you will either need to get the satellite system hooked up and working, a digital to analog converter box installed between the antenna and TV with one per TV, or replace the tube TV's with a new digital ready flat screen TV.
If it is already a digital TV then since you have two sat dishes, the previous owner took the sat boxes with him. There should be close to each TV a wall plate that has coax connectors which are connected to the antenna.
If you bought this from an individual, perhaps they could help you get them working. If you bought it from a dealer, they should have demonstrated that the TV's were hooked up and working.
2016 Newmar Bay Star Sport 3004