Recent posts to this thread have a strong element of the ridiculous to them. I'm not the best virtual pilot, but I can tell you guys that anyone who thinks they need more help to counter GVs attacking bases needs to improve their skill set.
Using existing game mechanisms I (see above disclaimer) can consistently find GVs attacking a base (assuming I see it flashing). If there is no dar bar, then there are GVs. You listen for them. You up a Storch. Then you either go out to kill them in another GV (more sporting), or if you like killing baby seals, in a ground attack aircraft. I've also noticed that many players can find and kill GVs using ground attack aircraft alone, even if hidden in trees (happens to me all the time).
MH