perfect ground?
8 dBi ?(looks like 7.87 to me) Could be because astroplane is a little directional.
Perfect ground inflates gain and hides the take off angle.
I have a dipole model at tip height of 36.25 ft , perfect ground gives it a gain of 8.04 dBi
Freespace gives the well known 2.15dBi
What height is the tip of your model at ?
Not saying that some model of the astroplane wont show better gain (or TOA) than a dipole but what you posted doesn't seem to.
Here is an adjustable astroplane model If anyone is interested in playing with it
Code:
CM 11 meter cb by ghz24
CE
SY z=62.85974 'driven element length
SY rh=-86.8202 'ring height
SY zp=6.972382 'feed gap
SY rsf=0.413083 'changes ring diameter
SY ch=9.221404 'capacitance hat length
SY ml=-200 ''mast length
SY pph=rh+(rh*-0.5) 'pinch point height
SY psf=0.97498
SY ppy=(30*rsf-zp)*psf
GW 1 1 0 0 0 0 -zp 0 0.48
GW 2 67 0 0 0 0 0 ml 0.75
GW 3 1 0 0 0 0 zp 0 .5
GW 4 7 0 zp 0 0 ppy pph .25
GW 5 7 0 -zp 0 0 -ppy pph .25
GW 6 7 0 ppy pph 0 30*rsf rh 0.25
GW 7 7 0 -ppy pph 0 -30*rsf rh 0.25
GW 8 9 0 zp 0 0 zp z 0.25
GW 9 1 0 zp z 0 zp+ch z 0.25
GW 10 1 0 zp z ch zp z 0.25
GW 11 1 0 zp-ch z 0 zp z 0.25
GW 12 1 0 zp z -ch zp z 0.25
GW 100 1 29.99994*rsf 0*rsf 0+rh 27.7163225*rsf 11.4804889*rsf 0+rh 0.25
GW 101 1 27.7163225*rsf 11.4804889*rsf 0+rh 21.2131466*rsf 21.2131466*rsf 0+rh 0.25
GW 102 1 21.2131466*rsf 21.2131466*rsf 0+rh 11.4804889*rsf 27.7163225*rsf 0+rh 0.25
GW 103 1 11.4804889*rsf 27.7163225*rsf 0+rh 0*rsf 29.99994*rsf 0+rh 0.25
GW 104 1 0*rsf 29.99994*rsf 0+rh -11.480489*rsf 27.7163225*rsf 0+rh 0.25
GW 105 1 -11.480489*rsf 27.7163225*rsf 0+rh -21.213147*rsf 21.2131466*rsf 0+rh 0.25
GW 106 1 -21.213147*rsf 21.2131466*rsf 0+rh -27.716323*rsf 11.4804889*rsf 0+rh 0.25
GW 107 1 -27.716323*rsf 11.4804889*rsf 0+rh -29.99994*rsf 0*rsf 0+rh 0.25
GW 108 1 -29.99994*rsf 0*rsf 0+rh -27.716323*rsf -11.480489*rsf 0+rh 0.25
GW 109 1 -27.716323*rsf -11.480489*rsf 0+rh -21.213147*rsf -21.213147*rsf 0+rh 0.25
GW 110 1 -21.213147*rsf -21.213147*rsf 0+rh -11.480489*rsf -27.716323*rsf 0+rh 0.25
GW 111 1 -11.480489*rsf -27.716323*rsf 0+rh 0*rsf -29.99994*rsf 0+rh 0.25
GW 112 1 0*rsf -29.99994*rsf 0+rh 11.4804889*rsf -27.716323*rsf 0+rh 0.25
GW 113 1 11.4804889*rsf -27.716323*rsf 0+rh 21.2131466*rsf -21.213147*rsf 0+rh 0.25
GW 114 1 21.2131466*rsf -21.213147*rsf 0+rh 27.7163225*rsf -11.480489*rsf 0+rh 0.25
GW 115 1 27.7163225*rsf -11.480489*rsf 0+rh 29.99994*rsf 0*rsf 0+rh 0.25
GS 0 0 0.0254
GE 0
GN -1
EK
EX 0 1 1 0 1 0 0
FR 0 0 0 0 27.18 0
EN
It may not be to the original dimensions of the AP but it can be easily altered using the variables.
This one shows a gain increase over a dipole, only a little but its there .
How about a peek at yours?