if you have two TVs, both have to be watching the same thing
I think the winegard has an aux (2nd) output so if you run two lines to the 722 ,both tuners will work.
You do not have to be on the same channel rather the channels have to be coming from the same satellite (info twice shows the current sat)
Also only the primary wire (tuner) will control the dish
there are some dip switches inside the winegard that have to be set for dish net because direct is the default factory setting