Does anyone know the process for getting a station added to the Sonos Radio index/directory? I can find plenty of info on how to manually add a station to your own Sonos app but not for their index/directory. I see a few stations on there such as OnTop and Vibes so it is possible but am scratching my head as to how. Anyone care to share?

Sonos uses TuneIn for its index, and you're find both OnTop and Vibes on TuneIn.

Update.

After receiving an email this morning from Radio.Net, you can now listen to your station on Sonos and Apple TV when index via their service.

https://support.sonos.com/s/article/2651?language=en_US

Full list of supported services for Sonos
https://support.sonos.com/s/article/3459?language=en_US