I missed the party, but I thought you might find the following useful. A Faraday cage is impervious to electromagnetic waves. It is not impervious to an elect

I missed the party, but I thought you might find the following useful. A Faraday cage is impervious to electromagnetic waves. It is not impervious to an electrical current. Or rather, if you apply two electrodes with a voltage difference on the Faraday cage, you will get a current flowing between the two electrodes (for a perfect Faraday cage, with a resistance of zero, and a perfect voltage supply, the current would be infinite!). Someone inside the Faraday cage equipped with a multimeter would be able to see this current, which in a real-world Faraday cage will flow along the shortest path between the two electrodes. If you vary that current over time, you will induce electromagnetic waves on the inside of the Faraday cage - indeed you have just turned your Faraday cage into an antenna. This is pretty much what was being done in the New Scientist article...