Posted for Noel Quiñones <noel@cginteractive.com>:

 Thanks Bill
 
 My antenna was mounted inside the rudder. I think it is the kind you
 mention. How good was your improvement? Noel
 

"Bill Kennedy" <bill_kennedy_3@hotmail.com> wrote:
 
"""
  My communcation improved when I purchased an external antenna from Pacific
 Coast Avionics. It extends down and aft for six inches or so and then bends
 straight aft. You will have to fashion some  sort of ground plane for it. I
 mad a spider of 12ga copper wire with about six radials. It works much
 better.
"""