  In the present study, a measurement setup utilizing mm-wave transceivers with
steerable directive antennas, mounted on both a customized UAV and a ground
station has been used to study Air-to-Ground (A2G) radio links and, more
generally, full-3D mm-wave propagation in urban environment. We evaluate the
double-directional characteristics of the channel by rotating the antennas,
deriving Power-Angle Profiles at both link ends. Preliminary results provide
useful understanding of A2G propagation, e.g. the influence of the antenna tilt
angles, or the mechanisms allowing for the signal to propagate from street
canyons to the air.
