I have Comcast basic cable. I'm in the Carpentersville area, outside of Chicago. I'm using my HTPC with Windows 7 as a DVR. Channels 98-0 (Discovery) and 99-0 (TBS) show up when I plug the coax directly into the TV, but don't show up with my HDHomerun tuner. Virtually everything else does. Are these analog channels? What kind of tuner would I need to pick them up?