Maybe this info will help,
Look at L.B. Cebik - W4RNL's site, near bottom of the page "Antenna Modeling
Notes" and listed is Modeling Trap Antenna's.
He gives some examples of values of the traps and other good info on page
two of Modeling Trap Antenna's.
Les - KL7J
Soldotna, Alaska 99669
From: Bob Perring <firstname.lastname@example.org>
To: email@example.com <firstname.lastname@example.org>
Date: Monday, November 17, 1997 4:40 PM
Subject: [TowerTalk] 6 element tri-banders analyzed on software
>OK, Here is a problem that, so far, all respond to me as being beyond
>their ability to perform.............. I'm right there with them ....
>>How does one analyze these various (TH-6, TH-7, TA-36) trapped
>antennas >with the available software, so as to be able to make
>accurate dimensional and
>>mathematical models of the elements when they were designed with traps?
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