@pelican47 -I remember them… and they sure didn’t work with those electric antennas. Turn off the radio, or shut down the engine… BANG! Gone went the ball! And I remember seeing them alongside the roadways (day-glo styrofoam litter). Nowadays, you’d be hard pressed to find a car with a visible antenna mast. Personally, I preferred Exxon’s “tiger tail” that attached to my gas cap (I’ve got a tiger in my tank) and stuck out the fueling cover as a gas-station giveaway.I also remember getting free glasses with each fill up. And premium gas (Ethyl) was only 29.9 cents/gal. Ahhhh, those were the days, my friend; we thought they’d never end.