Performance Data and Geometry Pattern and VSWR With Ground Gain Stacking

YBN 17m-5n with straight split Dipole

18.07 to 18.17 MHz WARC band Yagi.

YBN 17m-5n Current distribution

Performance Data (18.14 MHz)

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

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.

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

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