Except that “infrastructure” can be entirely man portable. Any kind of battery powered antenna to get the controller talking to the drone. And drones can be preprogrammed, this one probably was, this could have been done on straight dead reckoning programming, fly this direction, drop to this altitude, blow up when you hit something. This is literally an impossible technology to shut down. You can hamper some of the “other side of the planet” uses, but that’s stuff is all just showing off anyway.
Also, better keep those old shortwave radios handy when the SHTF.