Electric from radio??

Can anyone tell me whether you can get electricity from received radio
waves, please?
See this video...it has an antenna attached to a circuit of capacitors
and other stuff, and gets out volts from the other end....Does this
work? And if so, how does it work?

Thanks.

http://www.metacafe.com/watch/915226/free_electricity_from_thin_air/
.

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