huh - you didn't ask for that i think
choppername flyinheight 1
would let the chopper fly in a height of 1 meter
Just play around a bit to get the height you want.
Just an example now, of how it could be done:
chop1 (name of the chopper)
waypoint 1: move - onActivation: chop1 flyinheight 1
waypoint 2: move - syncronized with your radio call trigger
trigger1: radio-call - onActivation: chop1 flyinheight 50
:note - this trigger is the one, syncronized with waypoint 2
~S~ CD