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If someone wanted to test the 102" whip (or any otehr antenna) against the 10k in a reasonably controlled setting, they could assemble a large (18'x18') flat steel surface, and rig a mount in the very center. Support the surface a few feet above the ground to simulate height on a vehicle, run your coax under it, and do field strength tests with the various antennas you want to test. That should definitively tell you which antenna(s) have the best over-all performance. I understand that a vehicle doesn't offer a perfectly flat ground place,  and that different vehicles will work better with different antennas, but that method would at least single out the better ones to work with. In theory, once you determine which antenna is best in the control setting, its just a matter of finding the best mounting location on your particular vehicle.