making Enemy detecting script unlimited

i have a script that i need to detect if there is an object of a certain tag infront of it, it works, so long as i know how many of the objects there will be:

 var targets : GameObject[];
 
 function Update () {
     var targets = GameObject.FindGameObjectsWithTag("Target"); 
      
     
     var forward2 = transform.forward;
     var targetDir = (targets[1].transform.position - transform.position);
     
     var angle = Vector3.Angle(targetDir, forward2);
     if(angle <= 20){
         //do it's thing...
     }
     
     var targetDir2 = (targets[2].transform.position - transform.position);
     var angle2 = Vector3.Angle(targetDir2, forward2);
     if(angle2 <= 20){
         //do it's thing...
     }
     
     var targetDir3 = (targets[3].transform.position - transform.position);
     var angle3 = Vector3.Angle(targetDir3, forward2);
     if(angle3 <= 20){
         //do it's thing...
     }
 
 }

i need to work with any object of this tag within the angle, and there could be unlimited, thanks in advance!