Can someone also inform the debate on how these devices perform in high latitudes in winter. I suspect there is a band around the equator where they work well become worse as you move to the poles. Intuitively I think the point at which they start to become limited is going to be about 35degrees rapidly falling off to no capability for 6 months of the year as you pass the Artic/ Antarctic circles.
Blasting the things with micro waves assumes a degree of freed to operate from the surface.