VHF antenna for tractor

Hi, I'm new to this VHF radio stuff. I"m setting up a kenwood tk-762 in a couple of our tractors on our business band freqs. I'm looking at no ground plane antennas so I can mount them to the mirror bracket. All the whips that I find are around the 48+inch height range. Are there shorter options out there so I can have some more clearance for pulling into my shop.



THanks