Altering Material Alpha While Raycast is NOT Hitting

Hi, I have a top down shooter I am making, I have a script that makes it to when you go under a piece of geometry, the alpha value of that object goes down, only thing is that once I leave from under the object, the alpha value doesnt return to normal.

Here is my code so far...

 var target : Transform;
 
 function Update () 
 {
     var hit : RaycastHit; 
     
     
     Debug.DrawLine(transform.position, target.position, Color.green);
     
     if(Physics.Linecast(target.position, transform.position, hit))
      {
          hit.transform.renderer.material.color.a = 0.3f;
         Debug.Log("Something in the way");
      }
     if (!Physics.Linecast(target.position, transform.position, hit))
     {
         hit.transform.renderer.material.color.a = 1.0f;
         Debug.Log("Nothing In the Way!");        
     }
     
 }

I tried to think about it before I posted a question, and one of my ideas was to store the object hit into a variable, that way when the raycast leaves, I could just change

"hit.transform.renderer.material.color.a = 1.0f;"

to

VariableHoldingObject.transform.renderer.material.color.a = 1.0f;

Any help or suggestions would be greatly appreciated, let me know if you need further info!