tl;dw: XAVER (Range-R is the older one) doesn't see through metal buildings or walls lined with foil. It does see through brick and wood.
Let's be real: if you don't have at least a Faraday room by now, you're ngmi.
https://www.youtube.com/watch?v=ZfvmdX631Gc
Let's be real: if you don't have at least a Faraday room by now, you're ngmi.
https://www.youtube.com/watch?v=ZfvmdX631Gc