Like Mike B I chuck this in for future reference- I also have two, with a patch in the console. Long term plan is one does the AIS, but can be swpaped to the VHF should something happen to the "primary" one.
I have the Glomex 1m whip (fibreglass surround) and a "MK2" Vtronix raider, which, like Stephen's. goes "boiiiiiiiiinng" when smacked / bent double on the garage door. First impact the plastic round the base cracked, I filled it with silicon, and to this day it still works fine.
As for performance, not noticed a significant difference 'tween the two round the Clyde.
I THINK the old "Mk1" Raiders were more prone to failure than the new ones (New ones have a more tapered base, old style quite dumpy). There are more threads on the subject.
I also have a Shakespeare "suction cup" emergency one which started life as the main antenna on my SR4 in the dim & distant past. The main problem with it being finding a flat, smooth surfface to stick it to!