Posted for "John Schroeder" <jschroeder@perigee.net>:

 
 Chat -
 
 We have a Garmin 480 with the antenna mounted on top of the stack, under the
padded, covered fiberglass glareshield. It picks up 8 satellites with  no
problem outside the hangar. They do not require a ground plane. We also  do
not have a ground plane on the Blue Mountain and it pulls in 8  satellites in
side of the airplane in the hangar!!
 
 John