For DX situations i would go for feedpoint heigth.
For local situations i would go for top heigth
(as the concept of what the antenna cant see cant work theory)
For overall average combination i would go for center.
More importanly would be where is the RECEIVING antenna...
If you have the possiblity to set the receiveing and testing atnenna several wavelengths apart (approx >10) youre in a good place.
Both at central heigth from each other. In that way youll have no effect of TOA/groundwave/building reflection etc)
and youll need at least a couple additional antennas at ground level (or more than one) to "suck up" the ground reflected signals.
It is deffintily not that i have anything against you m8, i appriciate your honesty and way of thinking..but i sometimes have questions.. so perhaps you could "teach" me.
Where did you get the knowledge that changing feedpoints heigth "has the biggest influence"..
If we would take a look at a dipole and change the feedpoint...does changing feedpoint heigth changes TOA? no to my believe it does not.
The gain within the TOA changes but the pattern remains equal.
So...what does change....gain does,impedance does, bandwidth does...
Take a look at another antenna the cubical quad. Now feed the top of the quad or the bottum, now does that feedpoint change has the biggest influence on TOA?
You also could see it different..if what your saying is true in the elevetion pattern of the atennna for verticals, it also would be true in the azimuth pattern if we polorized the antenna horizontal.
Now does a windom or a dipole have different patterns...? (ofcourese both half wave)
Your refering to the higer center of radiation of the Sirio gainmaster as giving it its lower TOA (if im rigth). If that was the case....should we bring in tomorrow a top feed vertical dipole? that should outperform everything on the market...see where im getting at??
You say this is "true' for every antenna, are you sure?
kind regards, Henry 11 meter Dx antenna systemx