One thought came to mind: Placing an antenna in the glare shield might put
it significantly in the RF shadow of the (carbon) aircraft.  If you have a
glass area in your lower cowl (I don't have my cowl yet so I don't know),
perhaps a simple wire (the length wouldn't be too terribly critical) bonded
in place would do a better job and be out of sight.

Ed McCauley
President
Bottom Line Technologies Inc.
Specializing in Xilinx Design, Development and Training
Voice: (908) 730-7015
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