PBS feeds are
PBS-X (E Coast)
PBS-XP (W Coast)
I started out just picking SkyAngel, then edited the list by selecting Satellite, then Account, Customize Channel lineups, then Customize Satellite Lineup.
When you search on some of the call signs, you will get a list of two or three channels and you need to pick one. If the one you pick does not match up, then just try again and pick one of the others untill you find the proper listing.