Spawning static objects from trigger

[Buzzer1977]

I want to create/activate a static object (comm tower) from a trigger.
What is the required trigger action ?

The scenario is as follows: If cargo is unloaded in a specific zone, i want to have a COM tower activated (exists only as a static) and play a radio transmission. When i destroy the comms tower, the radio transmission should stop.

The later part with the play and stop, depending on UNIT IS ALIVE('comm tower') i've already have realized(RADIO TRANSMISSION / STOP RADIO TRANSMISSION). But i struggle to get the comms tower spawned with a trigger. The condition is already met (CARGO UNHOOKED IN ZONE) but what is the action ? With normal ground units i would mark the tower with late activation and do a GROUP ACTIVATE.

with best regards

tower buzzer