Re: ADSB In - Classic Cozy 3 Antenna Placement Experience
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I agree those ground plane wires may not work well. Any piece of wire will “work”, so would a wet noodle LOL. A half wave antenna is easier to make and would work predictably if you can find a nice place to put it.
I have two ADS-B receivers in my Cozy, one inside my ADS-B transponder and the other a dual band homemade Stratux. I have a printed circuit board J pole antenna made by the transponder mfg in the back upper side of the Cozy for that receiver. The Stratux has two home made J pole antennas in the nose, one for each band. See attached.
The J pole (see Wikipedia): is very easy and cheap to make and has a good omnidirectional pattern with about 2 dB gain over a dipole or ¼ wave with ground plane. Here is a page to calculate the dimensions: J Pole Calculator
With my antenna setup the factory made setup does not work as well as the Stratux with the home made antennas but both work most everywhere I fly.
From: firstname.lastname@example.org <email@example.com> On Behalf Of berkut13
Sent: Tuesday, June 23, 2020 7:36 PM
Subject: Re: [Canard Zone] ADSB In - Classic Cozy 3 Antenna Placement Experience
It may indeed “work”, but the radiation pattern is going to be significantly affected by the asymmetrical ground plane radials. Could cause some reception issues by ground stations in certain directions. No way to really know without extensive testing.
Virtual ground plane in the strake cavity has worked well for me for an Echo UAT. Good separation from the Mode C antenna under the front seat.
-Marlon Cozy3 N129GR