I don't think you will see the extra gain either but I have to test at about 1 wavelength above ground as they did to be sure in my own mind,
If after more tests i find the 3/8wave is still behind & that i am not embarrased with the ease at which i am able to dx long into the night when all other verticals have falen silent,
I would like to know what they did with the model to make it look so good,
I won't pretend to understand why nec has issues with gammas other than what Cebik says in the link I posted, the other info Cebik gives us worked first time for me,
The only planning I did was deciding to use a broken vector for 6mtrs because my diamond v2000 is shit on 6mtrs,
all I did was scale the lengths & hoop diameter,
I set the gammas up with a stock dogbone & 27mhz tapping point then put a second dogbone on the monopole near where I thought it wanted to be for 50mhz & marked it for cutting & drilling to keep the same gamma angle as the 27mhz versions,
turning the clamp 180 degrees set the gamma close to parallel on the 3/8 cone & fixed the tuning,
been working on the car getting it ready for its MOT between rain & snow with more snow forecast from sunday through next week so its not looking good for playing with antennas.
Good look with the scan.
