mfj 1728 nmo

I recently picked up a MFJ 1728 5/8 wave 2 meter-1/4 wave 6 meter NMO antenna for free but I noticed the whip stinger is now only like 16 inches long.....my question is with the remaining length of whip can I make this usable for a 850 MHz or 940 MHz 5/8 antenna with the remaining length of...