The guys came out today and upgraded my Dish service to HD. I got a 722 receiver and a 222 receiver. They pointed at 61.5, 72, and 77 and none of my 72W channels come in clearly. I checked the receivers, and both are getting more signal on 72 than on the other two, but I get very pixellated/freezing channels on 72. 61.5 and 77 are fine. Does anyone know what might cause this?