[ganoushoreilly]

I think the main reason traditional faraday cage style tech isn't deployed is the missions of these facilities. It's not just about blocking signals from the outside, you may be limiting or mitigating collection equipment or even broadcast equipment. I will say, anyone that's worked with portable broadcast / collection equipment (microwave or sat) are given clear directions to watch where you walk and no "cross the beams" because of various side effects to include sterility.

I wouldn't be surprised to find out that it's some weird counter effect from multiple systems internally that have been deployed at these sites.