Performance Data and Geometry Pattern and VSWR With Ground Gain Stacking

YBN 30m-4m with straight split Dipole

10.1 MHz WARC band Yagi.

YBN 30m-4m Current distribution

Performance Data (10.1 MHz)

Gain vs. isotr. Rad. 8.4 dBi
Gain vs. Dipole 6.3 dBD
-3 dB E-plane 62.0 deg.
-3 dB H-plane 96.4 deg.
F/B -13.5 dB
F/R -24.2 dB
Impedance 50 ohms
Mechan. Length 12110 mm + 2 x 70 mm offset
Electr. Length 0.41 λ

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

Radiation pattern with Ground Gain

At 16 m above perfect ground
At 16 m above perfect ground

Gain vs. isotr. Rad. 13.6 dBi at 25 deg.
Gain vs. Dipole 11.4 dBD
F/B -18.9 dB at 157 deg.

At 20 m above perfect ground
At 20 m above perfect ground

Gain vs. isotr. Rad. 14.0 dBi at 21 deg.
Gain vs. Dipole 11.9 dBD
0F/B -19.8 dB at 16 deg.