Since you appear to be only getting channels between 2 and 13, the antenna on the roof may be a VHF only antenna. Are you getting any signal from channels 25, 31, 41, 47 or 68? If you do, you should be able to receive the HD signals. If you don't, you may not be able to receive the HD signals until early 2009. All your local stations are currently broadcasting on UHF channels between 30 and 56.
The issues with 2, 4 and 5 might be caused by backfeeding from someone's cable feed. Cable and over the air signals use the same transmission frequency but in different ways.
At 27 miles from the broadcast towers, you might look into getting an indoor antenna. That way you won't have to deal with the mixing of the cable and over the air interference at all.
The issues with 2, 4 and 5 might be caused by backfeeding from someone's cable feed. Cable and over the air signals use the same transmission frequency but in different ways.
At 27 miles from the broadcast towers, you might look into getting an indoor antenna. That way you won't have to deal with the mixing of the cable and over the air interference at all.