It depends on where the whip is mounted, if mounted on the top of the roof like a mag mount, the 102" whip should perform better. I did what Charlie Brown did and cut a 102" ss whip down and fabricated my base load on my sirio 5000, I like it and it is definitely a much sturdier whip. If you aren't above 13-14 ft at the tip, you should be fine with a sirio pl5000 and the mag mount, although a permanent mount would be the best way to go. I have tried both the wilson 5000 and k40 and until you try a sirio pl 5000 it's hard to understand. The tx and rx is way better with the sirio, it's a taller antenna and better build quality IMO. Do your research as there are other antennas that if you hard mount, will work well, like a predator 10k or monkey made.