DB I could tell from the patterns you posted that the antenna was high...maybe even 2 wavelengths at 27 mhz, but I did wonder why. Like I've already mentioned, at the time I had no idea we had such a difference in the location of the feed point on our models. I know that ghz24 did a whole slew of CB antenna models using 4Nec2, and he likely did the A/P. Maybe he located his feed point on the mounting hub as well.
But, like I said above...I'm behind in this thread and I could have missed something. You may have made the height and location of your feed point for your A/P clear at some point.
I did try various antenna heights, including 2 wl and I did see somewhat similar patterns on raising, but no height came close to producing the gain you reported.
I also changed the feed point in my model to your position on the hub. The model is set at 32' feet not 72' feet. You'll notice the model set lower still shows a high gain even at normal heights for CB. This tells me that height is not the cause of you higher gain.
IMHO this high gain result is suggestive of the high 2.009 = 3.03 dB AG my model reported.
5.29 - 3.03 = 2.26 adjusted net gain for this model seems to be more correct. According to Eznec manual...this is possibly due to error in the feed point location. See attached section on Average Gain in the manual below.
I can't question your resuilts, but I'm trying to figure this all out. So, I sure would be interested in the trick ghz24 showed you.
That is obvious DB, but there is something else going on here. Check out my FS model above. Any Astro Plane Fans ? It has the Feed Point in the same location you use and it too shows nearly double the gain of a dipole at 0* degrees. In FS, height is not an issue, so for me this rules height out as the sole cause of the high gain.
