During TS Fay I noticed that that all of my HD channels (national and local) would go out and I would recieve the 771 message. However, I still was able to recieve my local SD channels and some of my national SD channels. Also, I was able to recieve my Hd chanels in 70's. I am having the same issue with both of my Hr20-700's. I know that I can expect to lose channels do the the storm but why can I receive some and not the others?