Radio Stations, what is their source?

Here in Portland, OR our public stations use all sources, MP3, casette, CD and, you can tell by the scratches, LPs. Interestingly, they also do a number of live broadcasts. Are you aware that a live radio broadcast is the only source available to most home systems that is not subjected to any form of storage media? Playing back one of these broadcasts on an excellent tuner rivals, and sometimes exceeds the finest CDs and LPs.

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Thats an interesting statement considering fm doesn't broadcast the full audio spectrum 20-20khz. 20-15khz if I'm not mistaken

Also add minidisc, CD-R and dedicated hard disk systems.