PBS is 384 on my DTV system and I assume it's the same where you are. I don't get that channel, though (it might be HD programming). I'll be watching the local PBS station here.
BTW, and tragically, this is a repeat. Matter of fact, I think I may have seen this one before if it's the episode that "introduces" the Salutorian people's Atlantic crossing theory. If so, it's a couple of yrs old.