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,,,, good, and then in what sense do you want me to optimize this antenna...????

I'll try, my friend....!!! But, however, the frequency range is very large...350 MHz....???!!!

,,, yes, it might, it must be tried ... !!!

,,, I repeat, it seems that the adjustment on the frequency range,VSWR or impedance is made by rotating the first director...

When a transmission line is terminated with impedance, ZL that is not equal to the characteristic impedance of the transmission line, ZO, not all of the incident power is absorbed by the termination. Some of the power is reflected back to the source so that phase addition and subtraction of the incident waves creates a voltage standing wave pattern on the transmission line. The ratio of the maximum to minimum voltage where the successive maxima and minima are spaced by 180˚ (λ/2) is known as the voltage standing wave ratio (VSWR).

Well, then post the electrical circuit of the assembly...!!!

,,,or this...

Adaptation,is much more complicated. Lines that are symmetrical but there was more on each printed circuit Board 2 Guanella current balun 4:1 ANTENNA OVERVIEW

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"Irg, very interesting this antenna, do you have something like that or these images are taken from youtube ??? ,,,,from here...???

,,, ok Bejo, you can do a drawing with this antenna....???

,,,okay,for 5,8GHz LA=WA=116mm or 230mm....I think that would be almost reasonable...!!!

,,,the distance between the vibrator and the first director(0,073*lambda ) as well as their different size...!!!

,,,where did you see this...???

This difference, increases the bandwidth and increases the distance between directors can increase the gain of the antenna.

,,,, but the dimensions are for the centre frequency f0 = 7.74 GHz...!!!! ,,,for 2,442GHz LA=WA=275mm or 545mm....so the antenna will be very large...!!!!

Clanon, you can create circular polarization by using cross dipoles. like crossed dipole or crossed bow tie antenna. moreover you can create CP by truncating stubing and sloting in a patch.You can get a circular polarisation with a planar spiral antenna which has the same circuit modelling of a dipole but with CP. For 2.4GHz sbf-antenna is very large in diameter(580mm)...!!!

,,,much better...!!! ,,, from this idea... ,,, and these are the dimensions of the antenna...

,,, be attentive to the coaxial cable portion with 75Ohm impedance...!!!

Sham, it would be nice if you read this...https://fpvlab.com/forums/showthread.php?3626-Crosshair-10-dbic-Circularly-polarized-antenna-tutorial! ,,, normally,it comes to 180 grd...!!! ,,,, and these would be the dimensions for some working frequencies... ,,, if you want an antenna on the frequency of 1280MHx,maybe I can help you

I don't remember this post anymore, but I think I also gave dimensions..!!

I think it is not an octagon with equal sides...!!!

I can not find, show me where on the forum ... !!!

Clanon, from where did you get these pictures...???