I have Direct TV, but in order to get HiDef reception, they must replace my dish with a different one mounted higher. To do this, it must be moved to my roof. I don't want that. Also there is an additional monthly charge. I live near Charlotte so there is plenty of over the air digital signal available. My question is, can I mount an antenna in my attic and combine the signal into the cable with the signal coming from the dish, so I only have one cable coming to the TV? The cable is in the wall and it would be much easier if I can do this. I know some of you guys are probably familiar with this. Any comments?