I Got this to even work with MCE 2005!!!!
steps:
Install the latest drivers for your HD card.. I have the 1600.. Install the QAM search tool.
Reboot
Run the OTA setup for the standard DTV signals, including guide setup.
Close Media Center
Create the Directory "C:\ProgramData\Microsoft"
Copy the eHome directory from "C:\Documents and Settings\All Users\Application Data\Microsoft\" to "C:\ProgramData\Microsoft"
Run Media Center and run the "Clear QAM Setup" in More Programs, Use the MOUSE!
If you get any errors, if there is a continue option use it.. if you are lucky enough to have VS installed, debug and skip the line causing error.
Reboot when asked..
Once your box comes back up Copy the contents of "C:\ProgramData\Microsoft\eHome\EPG\Prefs" to "C:\Documents and Settings\All Users\Application Data\Microsoft\eHome\EPG\Prefs", Reboot again
(Alternatively you can do this before the reboot, but I didn't do it that way, and my setup works, so this is what I suggest)
Once your box is up, Open Media center, If your new channels don't show up in the guide Do this:
Open up the file ""C:\Documents and Settings\All Users\Application Data\Microsoft\eHome\EPG\Prefs\atscprefs.xml", have it open on the screen.
in Media Center - got to settings, Guide, Add Missing Channels, Add DTV Channel.
you'll see the standard [ ]- [ ] Dialog for adding DTV channels.. in the first box, add the channel that shows up in "Major", Once you get through all the different "Major" Channels, save it and reboot your box.
If you can figure out what the extra channels are for, you can map them to a Affiliate, or another channel in the guide via the Edit Digital TV Listings, also in guide.