_trg=createTrigger["EmptyDetector",getPos xxx];
_trg setTriggerArea[150,150,0,false];
_trg setTriggerActivation["CIV","PRESENT",true];
_trg setTriggerStatements["this", "1 setRadioMsg ""Call Radio"""];
_trg2=createTrigger["EmptyDetector",getPos xxx];
_trg2 setTriggerArea[150,150,0,false];
_trg2 setTriggerActivation["CIV","NOT PRESENT",true];
_trg2 setTriggerStatements["this", "1 setRadioMsg null"];