It's not really like radio, it's a bunch of people running their own shows at times of their choosing. But if you follow a bunch of people who are doing 2-3 shows a week, pretty soon you will find that when you look at the "Following" page to see what's happening right now, something worth listening to is probably on.
Here's what my Following page looks like at the moment: https://i.imgur.com/7OXkRbN.jpeg
Not too good, but it's early still. Only one person I follow is live and it looks like they are chatting instead of playing music, which is unusual (and I won't bother to listen).
There are some recommendations below. If I click Show More, I can see 8 other live streams. (I can see more under the Browse feature.) : https://i.imgur.com/U5Bvec5.jpeg
Some of these 8 I recognize as being not my taste, some show genres I don't care about, but there are a few that I will check out. OK... the reggae dude was playing hip-hop which isn't my bag but I might check back later because I like reggae and ragga. The funk dude was playing great music but wouldn't shut up. SlugRadio is playing some good EBM that is new to me, the DJ puts up a track ID in the chat stream, and most importantly doesn't seem to be on mic all the time. So that's a good find and if the music stays good, I'll probably Follow that channel. (this is what the stream looks like: https://i.imgur.com/cCFPpG7.jpeg)
One other thing...
Twitch lets you watch replays of shows which gives you even more ways to find something to listen to... But, they process saved videos and knock out copyrighted audio, so most recorded DJ streams are mangled. For some reason, Twitch gets away with letting people do anything they want when the show is live, while YT uses realtime detection to mute your stream and issue a copyright strike.
~~For now I am not messing with my extensions to prevent the YT message. I found that the extension Kill Sticky, which eliminates all kinds of elements that cover content, blows away the popup. So, I just dismiss the message with one click when it comes up.~~
~~Eventually the adblocker situation will improve, I hope, but for now doing it this way is only a minor inconvenience.~~
Edit to add: Well I got the "countdown" popup, and you can certainly dodge it by blowing it away with a tool that deletes overlays... but the countdown continues and then it does block the content in a new way. Other people posted that accepting the ads once resets the countdown, this did not work for me. I ended up installing my own Invidious instance since I have a Linux box on my LAN but I look forward to better anti-anti-adblock extensions.
SmartTube on Android TV still works great.