Interestingly, at the beginning of the video he mentions that 122 GHz antenna transmission has shown to work for distances of 60 kms.<p>The curvature of the earth is that you need to be elevated 400-500 meters over sea level to have a sight of line of 60 kms to the horizon; the horizon is only 5 kms away at the 2 meters elevation.<p>Perhaps those measurements were done mountaintop-to-mountaintop.