Actually, the SD and HD locals are mapped to the same channel!!!
You can not direct tune to the HD channel, even if it is blocked off in your "Favorites List". For example, in Atlanta for WAGA Ch 5, the first thing listed in the guide is AT5 and the second is WAGA. You can remove AT5 from the guide, but if you punch 5-Select on your remote, it will tune to the SD AT5 channel. I had to program my Pronto to send a 5-Select-ChUp sequence so when I press my "FOX" button, it will tune to AT5 and then Channel Up to the WAGA HD channel.