First the Fritz is not a maverick missile, its a glide bomb. Buffs won't be low enough to use them very well, if so a single Wirbl will have a field day.
Fritz is not much of a threat to a tank in a field, but on a V-base its a serious threat to those who camp Concrete or spawns.
That's my point, concreate sitting makes you a static target, and the Fritz x can hit a static target but the delivering bomber would be in icon range and so be in range of any Field guns or AA vehicles around. The bombadier would need to guide the target in by keeping the fritz in sight , and I'm sure it would be tough to get close to a gv as you would need to judge the height of the fritz sand you have a fair chance of hitting early if the fritz is lower than you think a moving target in a terrain with hills and trees or even buildings will be even tougher.
