No intention to divert the topic of the thread,
just a little sidenote.
I would always go for game logics rather than invisible Hs,
because if you have lots of invisible Hs in your map and call
for chopper extraction later the chopper might land on one of those (if not intended) except you use a script that sticks an invisible H right under the
chopper. You can of course setpos [0,0] the invisibleH after you have created the grenades. Anyway, can't wait for CoC's Arty converted for Arma, as it's so much nicer to have ballistic mortar shells than "faking" them.