The O N L Y disadvantage that I can see with this antenna, is that it is a center load antenna. Which means it might swing wildly under sudden acceleration or braking. On the other hand, center load antennas are superior to base load antennas - a desirable thing. But all antennas will flex under accel/decell; having the weight higher makes it slightly worse. But if it is mounted firmly, it shouldn't be a real problem at all. Should work as well -or better- than any base load antenna.
From what I can see of this antennas construction - and if mounted top/center of the vehicle - it has the potential to work as well as a Predator10k. Well; by design anyway - sorta/kinda. Some Predator10K's have a 6 inch shaft before the coil, and then a 6 ft stinger/antenna whip. So there are some similarities.
Check the SWR on ch 1, 20, & 40; get it as flat as can be consistent.
Should be 'good to go'...