I've played with some 6Ghz 2$ microwave radar sensor and Software Defined Radios though I have not yet used 60Ghz.
Electromagnetic Waves are kind of magic when used in not conventional ways. I remember seeing the 2015 disney EM-sense video https://www.youtube.com/watch?v=fpKDNle6ia4 which is a non-radar way to listen to the environment.