some links to give some background

On pirate radio:
http://www.offshoreradio.co.uk/
http://www.sterlingtimes.co.uk/pirate.Html
http://en.wikipedia.org/wiki/Pirate_radio
http://www.acmi.net.au/AIC/PUB_RAD_OZ_LANGDON.html
On Phreaking / Hacking and media activism:
http://en.wikipedia.org/wiki/John_Draper
http://www.slais.ubc.ca/people/students/student-projects/J_Heaton/phreakers.htm
http://en.wikipedia.org/wiki/Blue_box
On Noise Music and instruments:
http://en.wikipedia.org/wiki/Noise_music
http://www.cementimental.com/links.html
http://www.futurism.org.uk/music.htm
http://www.anti-theory.com/soundart/instruments/prototypes/history10.html