“To project that large of a hologram over that distance would have required an awful lot of support equipment, power and a mighty tall tower for projection to pull that off.”
Well, since we have no idea exactly what kind of technology could create that kind of projection, it seems to me that there is no sense in speculating how much power, equipment, etc it would take. Might be something that could be housed in a plane (like the Airborne Laser) or even a satellite.
Roger that... never say never.