Crystal radio idea?
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It's probably been done already, but here goes:
How about making a two part receiver, one stage for the normal detection
and tuning, the other a really wide band receiver with a conversion
portion in it.
That part would collect any and all signals hitting it and convert it to
a very small dc output. That in turn could be used to power an amplifier
for the audio of stage one and then work a small speaker.
Surely there should be enough broadcast power over the entire AM band,
that, if collected and rectified, would drive a 2 inch speaker at very
modest levels.
mike
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