I have a stub antenna installed on the underside of my Ventus 2cM fuselage
(carbon-fiber / epoxy).
No scientific testing, but it seems to work just fine.
The high frequency electro-magnetic fields generated by transponder antennas
hardly penetrate at all into metal or graphite, so I wouldn't expect 5
layers or 50 layers to make any significant difference.
Ray

"5Z" wrote in message
ups.com...
On Apr 6, 8:07 am, "Ken Kochanski (KK)"
wrote:
yeah, understood, hardly that many ... I just want to know if we have
any actual test results.

Standard practice for Schleicher is to install the antenna on the
ASH-26E, ASW-27, etc... just behind the main wheel. Pretty much looks
like they just drill a hole and install a typical antenna with no
other prep work.

Beyond the lack of complaints of poor performance, I don't know if
there has been any scientific testing performed to prove out the
installation.

-Tom