So according to this it only works if you have iTunes installed.

So here is a much simpler method to acquire iTunes Podcast RSS link directly:

1. Go to the podcast page, like this

2. Get its Apple ID, like the above example, 350359306.

3. Go to this page http://itunes.apple.com/lookup?id=350359306

4. See the feedUrl ?

   "feedUrl":"http://www.howstuffworks.com/podcasts/stuff-to-blow-your-mind.rss"