I think you'd find it much harder to block RF signals than you would expect. As Matt Blaze found[1], creating even a small effective faraday cage can be quite d

I think you'd find it much harder to block RF signals than you would expect. As Matt Blaze found[1], creating even a small effective faraday cage can be quite difficult, and I imagine the problems only compound as you scale up. 1. https://www.mattblaze.org/blog/faraday/ https://www.mattblaze.org/blog/faraday/