I'd like to make a suggestion for a different app, try Xiia Live (Pro)
, it is really superior to TuneIn. Check out their website
I'm a sysadmin for a podcast. Used to do a lot with Tune In. But then the Tune In crew changed everything that made their app nice, removed features, and added features nobody wants. Apart from that, their Pro app is over €11 !! And nothing goes to the community. Really, they are not helping the podcast community.
Xiia Live is interesting for developers
too... And they make use of public radio directories
Plus, you should take a look at the interface. I am hoping that this app will become the more popular one, because it actually works together with podcasters and radio stations.
Finally please note - I'm not affiliated with them in any way. I'm just a fan!