For some reason, none of the automatic methods for program assignment work for me. I searched for it a bit and concluded it was most likely a setup issue from my cable vendor (TimeWarner). I decided to bite-the-bullet and do it manually, but even that took some work.
My Process
1. Open HDHomeRun Setup and get a list of channels that the HDHomeRun sees.
2. Look-up your TV signal's information on http://www.silicondust.com/support/channels/
This will tell you the type of signal (QAM64, QAM256) and helped me decode the real channel number.
3. Open Windows Media Center and go to the "Add Missing Channels" menu option.
4. Click "Add QAM Channel". Enter the channel number. This is the number from the "Tune" column of the HDHomeRun Setup. For instance, "CH18-1" would be entered as 18.1.
5. Select the proper QAM setting. This information is available from the SiliconDust Channels website.
6. Give the channel and name and add it.
7. Go to "Edit Channels" and click the channel you just added.
8. Go to "Edit Listings"
9. Find the proper listing for the channel. You can type the first few characters of the channel name (i.e. KTVT) and it will take you to the matches. Select the proper channel.
10. Repeat for all the channels. Fortunately there are only a few free unscrambled OTA channels.
