Newbie question, but I can't find an answer on a search. I just got a 722 receiver from Dish. We get some locals through the satelite. It has an antenna input for OTA tv. I did not hook an antenna up yet. But went to explore how to get the locals on the menu. I went to the menu and the locals button was greyed out. ??? Do I need a antenna adapter like this?? ([amazon B003UQOVXI ) I did not think so since it has the antenna input already. Am I missing something??? Thanks