  With growing interest in mmWave connectivity for UAVs, a basic question is
whether networks intended for terrestrial users can provide sufficient aerial
coverage as well. To assess this possibility, the paper proposes a novel
evaluation methodology using generative models trained on detailed ray tracing
data. These models capture complex propagation characteristics and can be
readily combined with antenna and beamforming assumptions. Extensive simulation
using these models indicate that standard (street-level and downtilted) base
stations at typical microcellular densities can indeed provide satisfactory UAV
coverage. Interestingly, the coverage is possible via a conjunction of antenna
sidelobes and strong reflections. With sparser deployments, the coverage is
only guaranteed at progressively higher altitudes. Additional dedicated
(rooftop-mounted and uptilted) base stations strengthen the coverage provided
that their density is comparable to that of the standard deployment, and would
be instrumental for sparse deployments of the latter.
