Actually, that faraday cage thing isn't an all bad idea....
When we built our office, it started out as a prefab metal building. But when finished, we realized that our wireless network no longer worked and we couldn't get cell phone coverage either, so everything had to be hardwired.
As a consequence, my phono stages are extremely quiet and I've had more than one person comment on how low the noise floor in my system is.
Kind of happened by accident, but it does work!