It's a 40" dual-band whip. It works wonderfully on mobile simplex. I've two pals who purchased from my recommendation.
It will fold down by pulling up on the lower 2 inches. I did not add the optional spring.
We all have it mounted NMO on a large magnet base mounted center of the cab on metal p/u trucks.
It's a wide band antenna supposed to be good for FRS/GMRS...I don't scan other than ham freqs so can't help there.