Jackal1 mentioned this in the divebombing buff threads... as comedy, but I thought about it for a minute, and realised players could do it for themselves.
I think it'd be easy to do. Anybody with a second account, and a headphone to headphone cable can do it. Grab a cheap spare pc, laptop, whatever. Log it in to a spare AH account on the pc you're gonna broadcast with, plug the output of the space pc into the mic jack of the account pc. Start winamp with looped Tokyo Rose sound bites and music on the spare pc. Tape down the chan x-mit key on the broadcast pc. Walk off.
As long as it stayed connected, and HTC didn't get mad about taking over a public vox chan, anybody could tune to Tokyo Rose.

In fact, with all the neat tools winamp has for voice over, mixing, etc, etc, you could host a live radio show if you wanted to.