Paper clip phenomenon (FM Radio)

[Tiroloco2000]

I've noticed than when you shake any metal pieces (for instance: keys, paper clip chain, etc) near an FM transmitter, you can hear ugly noises on a receiver. I've asked a lot of people and they refer to it as the "paper clip phenomenon", however nobody can come up with an explanation for the mechanism as to why this happens. (the radios I'm using are pretty darn good FM synthesized radios. Even a fancy signal generator has the same behavior. Does anybody outhere has any ideas about the mechanism of this phenomenon? and if possible, experiments to prove or disprove any theory you can come up with?

 

[Descartes]

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[CTho9305]

semi-wild guess:
if a radio transmitter creates something similar to a magnetic field (or actually does create one), then moving the paperclip would induce a current in the paper clip, so it might act like another broadcasting antenna. That would make the noise.

If this is true.... using a longer wire, and moving it really fast should have even stronger effects.

 

[blahblah99]

here's my guess...

when you shake metallic objects near a transmitter, you are disrupting the wave's phases and hence causing them to be received at the reciever out of phase. Now, if you shake the metallic objects fast enough, you are disrupting the wave's phase so fast that the noise you hear on the receiving end seems like white noise.