Underground radio station recommendations?

Soma FM 

Here's a handful of streaming links to what you're looking for. I don't know if they're underground per se but they play more obscure stuff often.

Frequence 3 - http://ice1.ikoula.net-radio.fr/frequence3urban.flac.m3u

http://trap-high.rautemusik.fm/

https://ice55.securenetsystems.net/DASH8

https://www.internet-radio.com/servers/tools/playlistgenerator/?u=http://144.217.203.184:8089/listen.pls?sid=1&t=.pls

Lookup Radio Meuh from France and Dash Hip-Hop X from California

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