So yesterday, I went to McDonald’s drive in Clifton Park to get some coffee. The sign said “9 foot clearance”. My CB antenna hit the clearance bar. No damage, as the spring did its job, but I surprised. I hadn’t actually measured the antenna, but I knew the hood was 4 ft, the antenna was 4 feet and mount and spring were six inches. That equals 8’6″ to the top. So why did I hit? I don’t know. When I got home, I checked with my measuring tape, and sure enough, my estimate was right — the antenna is 8’4″. Moral of the story… don’t trust clearance signs at McDonalds.