I installed this and when I turn it on it stops all internet access to any app needing to access the internet. For example my podcast app immediately stops working.
Might be time to consider a different Podcatcher.
It depends on which podcasts you listen to which services you need to unblock I think. The 'essential' category is usually a good starting point but you might need more, especially for the search which iirc comes from Apple/iTunes.
You can also just whitelist AntennaPod completely of course, being an open source app from F-Droid that's relatively trustworthy.