This is my favorite. (Phone card included for scale.) I’d say it’s either a tactical bullhorn or a vehicular-mounted candelabra, but it’s not for me to decide. That’s for you!
UPDATE:And the winner is…The Other Mac, with his ODIFER idea – sounds like something that would be extremely useful.
Unfortunately, it’s just what we call a Band III Feed Horn, a thing that sticks into the head of an antenna and makes radio waves shoot out or something. It’s all very technical and mysterious.