Frontline PBS feed

I cannot seem to find a feed for the PBS Frontline shows.
Is there one? I see a Frontline World, but that seems to
be too old. I tried to manually add the feed from

http://www.pbs.org/wgbh/pages/frontline/rss/

but the feeds there seem not to validate.

Is there anyway to add Frontline?

thanks in advance,

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