Antenna beamwidth independence of measured rain attenuation on a 28-GHz Earth-space path

Rain attenuation measured at 28 GHz on an earth-space path is independent of antenna beamwidth for beamwidths as small as
0.1\deg
and for attenuations up to 30 dB. The measurements imply that angle-of-arrival fluctuations are less than
0.02\deg
.