I'm not sure the "painting" of the umbrella added much benefit. Most of the tracking ability would be lost with any opaque head covering
RobotCaleb 2 days ago [-]
Then I think you're missing the point. Any opaque head covering would not be enough to bring the drone in to capturing or sensor attacking distance. The point is to get the drone to close distance not to stop tracking.
Twenty second demonstration video: https://youtu.be/tXDb5lqqFgw?si=NcAxtJIPVaLgYmun