I was watching the MLB channel on DirecTV and they carried a live cut-in of the Giants-Cardinals game from St. Louis using the CSNBA-HD feed, but its not being showed in HD on any carrier (not even Comcast) that I can find in Northern California. What gives?

MLB was using a feed directly from the stadium. They do it with broadcasts from MASN and other FSN regional networks that aren't being broadcasted in HD on a television provider.

I wasn't watching closely, but I have CSNBA-HD and the game looked like it was in HD. In Northern California on my Comcast Cable.