I do, actually, use Antennapod so it’s feasible there but I also use Elfeed in Emacs and Podcasts, on Linux mobile, which (I believe) both require you to find the RSS feeds yourself. So that’s usually where I run into the need to manually hunt down RSS feed manually.

Like I said, it’s possible that I just missed how Apple Podcasts exposes the RSS feed transparently but I’ve never been able to find it via just browsing the site to then put into the latter two programs.