said by fuziwuzi: I give up. I'm just going to Best Buy and getting an antenna.
Have you tried going into chat on the Comcast support page? Worked for me, took a few minutes of questions before he asked for the serial number on the HD DTA, then a few more minutes for the signal to go out and the box reset.
Tell them the HD DTA is skipping the HD channels, (I gave the range it was skipping), and as a limited basic subscriber you are supposed to get them.