Hello. I don't have Dish but trying to help a family member connect a 2nd TV. I'm a DTV customer. He has the HD DVR in the living room & has removed the receiver out of his bedroom. It is connected to the coaxial wall plug that he says goes to the dish but everything is bad quality SD. He can tune to NFLN so it's not just using the coaxial as a (weak) antenna.. How is this possible & is it possible to get an HD feed this way? Thanks.