Stealth aircraft deploy them whenever they’re operating in civilian airspace so they can integrate into the existing radar-based ATC infrastructure. They’re ca

Stealth aircraft deploy them whenever they’re operating in civilian airspace so they can integrate into the existing radar-based ATC infrastructure. They’re called Luneburg Lenses: https://en.m.wikipedia.org/wiki/Luneburg_lens https://en.m.wikipedia.org/wiki/Luneburg_lens