I live by Dove Valley (Parker,CO ) and for over 3yrs I've been able to receive Channels 9 (NBC) and 20 (CW) without issue using an RCA indoor HD antenna. Two days ago these networks disappeared and despite where I move the antenna to and rescan I can't find them. They were alwasy the easiest to get and the most watched. Does anyone have any ideas? At this point all I can think of is is to buy a new antenna and see if it helps......