REFLECTOR: Transponder Antennas

[Jack Sheehan]

Craig,
I use a standard 1/4 wave dipole that is used on 
most aircraft. I mounted it on a ground plane 
about 7 inch square aluminum . The ground plane 
is mounted under the oil cooler in the nose with 
the dipole pointed down. Works great.

Jack
Race 55
N55XL

At 08:05 AM 2/25/2008, you wrote:
>Hey all-
>
>   John and I have a homemade ¼ wave transponder 
> antenna mounted under the battery in the nose 
> of the aircraft (completely) inside.  When we 
> first started flying we got occasional 
> complaints here in SoCal about losing our 
> beacon.  Now it happens much more frequently 
> and it appears to be when we are low and in the 
> “ground clutter”.  The frustrating part is the 
> GTX 330 shows a reply light even when ATC says 
> they can’t see the code.  They are getting a primary but no code.
>
>Where have other located their antennas and what type?
>
>Has anyone tried the Archer or Advance Electronics Antennas I see in AS?
>
>Craig
>250hrs
XL-5FG Flying in Lancaster, CA
>
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