I spent an obsessive journey wanting to add radio stations to my radiotray-ng. It took days.
It took days because nobody is giving anything away, not even streams. Radio stations already in VLC or Rhythmbox won't be ported to radiotray-ng. Also radiotray-ng prefers the archaic .pls format (and .m3u).
If the mods leave this post up, I did find a legal open source site:

I typed 'funk' into their search bar and picked a German funk station:

clicked on the title it took me to the info page:

I wanted the station Name and URL to paste into radiotray-ng's Bookmarks Editor where I pulled down ADD a station:

You heard that right. Much old info for radiotray-ng has one appending the bookmarks.conf or bookmarks.json. You don't need to do that anymore. Use the GUI editor shown above.
saved and added:

save bookmarks editor (in gui). repopulate bookmarks editor (in gui). and you see it in the pulldown station
list:

When you play a station you get a desktop notification to confirm:

I'm Funking out as you can see.
I just added a couple stations, I'm not greedy. But I did bookmark this open source resource.
more from the site owner, who is funded from opencollective:
