How can I harness the current induced in a Faraday cage for practical use?

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caybo
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http://img212.imageshack.us/img212/2931/energyplan26qs.th.png

There is my uh rudamentary drawing of a scenerio where something emitting em waves(green) is surrounded by a faraday cage(yellow). umm I believe current is induced in the 'cage', how would I divert the current to use, because if I am correct the current has to has reason to leave. How could i use it on a load, or anything?

Any suggestions of anything that could help me along here?

P.S. I am actually using a cut pop can as the faraday cage.
 
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There is no way to channel the current without losing the shielding effect.
What you would have then is just a receiving antenna.
The only use I could see of the current is to heat the can,
but it would be hard to get much heatng this way.