In the 90s, the Internet technology such as RealAudio/Video has put micro radio onto the right track. Since it is no more difficult for individuals to broad-cast the same information to the global area, micro radio can concentrate itself into the very meaning of its 'micro-ness' and its 'autopoietic' character. 'Micro' shouldn't be the antonym of 'macro' anymore. Micro radio does not 'cast' anymore but is interactive and streaming.
Documents of the live streaming:
Vintage Sound Data
"Radio Home Run in the Net" (NetRadioHomuRun)
Radio Kinesonus
Art's Birthday