You could also use this when you activate the radio
It will create an exposion when activated.
shell = "heat120" camcreate [(getpos gl1 select 0)+10, (getpos gl1 select 1)+0, (getpos gl1 select 2)+0]
shell = "heat120" camcreate [(getpos gl1 select 0)+10, (getpos gl1 select 1)+0, (getpos gl1 select 2)+0]
The gl1 is the name of the game logic unit you use to
select the position.
Just create whatever shell you need.
And the +0 at the end of each brackets is the position [x,y,z]you could choose. The end one,z is meters above the
ground.
Hope this helps ;D