Gain vs. isotr. Rad.  10.2 dBi
Gain vs. Dipole        8.0 dBD
-3 dB E-plane         54.6 deg.
-3 dB H-plane         73.0 deg.
F/B                  -24.6 dB
F/R                  -24.2 dB
Impedance               50 ohms
Mechan. Length       11812 mm + 2 x 50 mm offset
Electr. Length        0.71 λ

Stacking Dist. h-pol. (18.14 MHz)
top-to-bottom          13.9 m   or   45 ft

Geometry

For building on a 50-70 mm boom, 30 mm mid-element tubes insulated with hydraulic clamps like from co. Stauff:

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Pattern and VSWR Plots

Elevation and Azimuth plot at 18.14 MHz

 

SWR and Return Loss plots - simulated with 4nec2

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Radiation pattern with Ground Gain

At 16 m above perfect ground

At 16 m above perfect ground

Gain vs. isotr. Rad.  15.8 dBi  at  14 deg.
Gain vs. Dipole       13.6 dBD
F/B                  -26.9 dB   at 168 deg.

Gain vs. isotr. Rad.  15.9 dBi  at  12 deg.
Gain vs. Dipole       13.8 dBD
F/B                  -24.7 dB   at 168 deg.

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Stacking

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73, Hartmut, DG7YBN