> so there's a microwave frequency that is completely unaffected by atmospherics? In which water, ozone, the rest of the gas mixure and particulates are mostly

> so there's a microwave frequency that is completely unaffected by atmospherics? In which water, ozone, the rest of the gas mixure and particulates are mostly transparent? Nope. The transparent bands are in the visible spectrum and far infrared(8-14um). Microwaves are mostly uniformly absorbed by water molecules: https://en.m.wikipedia.org/wiki/Atmospheric_window https://en.m.wikipedia.org/wiki/Atmospheric_window