Posted for "Chatfield S. Daniel" <csdaniel@FNBSouth.com>:

 Hi again guys,
 
 
 
 Can someone tell me if a GPS in a glass airplane needs a ground plane?
 I have 2 GPS antennas mounted in my ES that seem to work fine without
 ground planes.  I am about to make some changes with these and will add
 a ground plane if necessary.  Thanks for you input.
 
 
 
 Chat Daniel
 
 Super ES N891AC