Or not...
I get at least two HD PBS channels Off The Air on a $60 converter box.
.... and the 42" HD TV gets 'em , too.
Each station has additional content on sub-channels.
So, don't forget to keep your options open. :up
Over-The-Air doesn't offer much in my area unfortunately. The closest set of network stations including PBS would be at least 120 miles away.
What surprises me a bit is that PBS uses Ku-Band to transmit to the stations. C-Band doesn't have the rain-fade issues that Ku has..