Yes, I got results on the carbon fiber and I would have SWORN that I posted them
to this site.

Putting a GPS antenna UNDER a small bowl-shaped carbon fiber radome immediately
killed any GPS signal into a 27 dB gain active antenna INCLUDING satellites that
were directly overhead.

Figuring that the carbon was so lousy a transmissive path, I drilled a hole on
the top of the bowl and used the bowl as the groundplane. VIOLA. The GPS
antenna worked every bit as well on TOP of the carbon fiber as it did on a metal
ground plane of approximately the same size.

I can't say this is true for any other service than GPS (transponder, vhf nav &
com, etc.) but it did test well for GPS.

Jim



Richard Riley
shared these priceless pearls of wisdom:

-
-Did you ever get results on the carbon?

Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com