Looks like I am having the same problem on my 816. I had to go back up on my roof to reposition my directional HD antenna.
I actually waited a while longer and Mediacenter finished teh setup but I am still having trouble getting signals.
More later.
David
http://i99.photobucket.com/albums/l299/xz550rj/HPMagicGiveaway.jpg
Woohoo! I won my Touchsmart!
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