For reasons unfathomable, iTunes is still pooping when it comes to the Harry Strange Radio Drama's rss feed. Here is a temporary workaround:
From the iTunes menu bar: select File/Subscribe to Podcast and paste this address in the field that opens http://harrystrangeradiodrama.libsyn.com/rss Click on FEED and you'll have access to the entire Harry Strange Radio Drama catalog.
We hope iTunes gets this resolved soon. Thanks for your patience.