WRUW FM 91.1 Cleveland embodies the spirit of college radio. The station always has an incredibly diverse lineup, from your typical college student indie-rock shows to public affairs shows to (supposedly) the longest running jazz show in the country (Down By The Cuyahoga on Friday nights).
The station is operated out of Case Western Reserve University, so the DJs are split between community members and CWRU students. Not every show will be your favorite genera or expertly produced, but the vast diversity of shows pretty much guarantees you'll be able to find a few shows you love. The DJs here are all volunteers, so each show is on the air because the DJ really wants to be doing it. For listeners, this means the DJs have immense knowledge of and passion for their genre.
WRUW may lack some of the polish of a commercial radio station, but the incredible diversity of programming and unbridled passion of the DJs at this radio station more than makes up for that at this Cleveland gem.
Full disclosure: I've been a student DJ here for the last 4 years.