Fox Valley Radio: radio discussion for the valley and surrounding areas (not affiliated with this site).
BrewCityRadio: A place to discuss Milwaukee radio, among other things.
Radio-Info Milwaukee: Another Milwaukee board, but this one is spam free.
MadCityRadio: A good place to discuss Madison radio if you can get past the numerous Hot 105.9 posts.
WBP Discussion Forum: This board covers all of Wisconsin, with a section for each part of the state.
Wisconsin Radio: Forums for radio, rants, rumors, and more.
HappyPine: Southpine is dead, so here is the alternative.