I have a RCA ANT 1450B that supports HD(1080P) local channels and it says if i connect it to the OFF-AIR in my DIRECT TV box, I will be able to see my local channels in HD and my DIRECT TV channels normal. The problem is; when i plug it in, it doesn't do anything and just stays on normal STANDARD view. I plugged it in to my TVon a HD local channel and it looked good. I then plugged it into my DIRECT TV OFF-AIR and it didn't change. i had tried to turn it off and on and it wont work. PLEASE HELP