It can be problematic finding a url for an internet radio station that works with Roon. Many stations have urls tied to a pop up streaming device , and those won’t work with Roon. Sometimes it can be difficult to find any “normal” url at all for a stream.
I suggest Roon add a pre setup index of Internet radio stations and their urls - much like what exists already in Logitech Media Server in it’s internet radio function. Then you can just click on an existing url from the list in order to listen or to add it to your library.
Internet Radio is going to get more love (no timeframe announced) and there are interesting noises from the devs every now and then about user sourced information. I have no idea what that might look like, I just know they’ve been thinking about it.