Gain vs. isotr. Rad.   9.9 dBi
Gain vs. Dipole        7.8 dBD
-3 dB E-plane         55.2 deg.
-3 dB H-plane         74.2 deg.
F/B                  -24.3 dB
F/R                  -17.0 dB
Impedance               28 ohms
VSWR Band Width       14.0 MHz = 1.15:1, 14.35 = 1.16:1
Mechan. Length        13,000 mm exclusive boom offsets for elem. plates
Electr. Length        0.616 λ

Stacking Dist. h-pol.
top-to-bottom        17.5 m or 57.4 ft
side-by-side         22.8 m or 74.7 ft

How many HF operators have been looking up this design since Dec. 2018?

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Geometry

... is available in request

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Pattern and VSWR Plots

Elevation and Azimuth plot at 14.2 MHz

 

RL and SWR plots - simulated

Tapered Model Azimuth plot 14.0 - 14.35 MHz

14.00 MHz    F/B = 17.32 dB    Gain = 9.75 dBi
14.10 MHz    F/B = 20.34 dB    Gain = 9.89 dBi
14.20 MHz    F/B = 23.55 dB    Gain = 9.89 dBi
14.35 MHz    F/B = 28.75 dB    Gain = 9.87 dBi

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Pattern and VSWR Plots over Ground

Azimuth plot at 14.2 MHz at height of 18 m (perfect gnd assumed)

Azimuth plot at 14.2 MHz at height of 24 m (perfect gnd assumed)

VSWR plot at 14.2 MHz at height of 18 m (perfect gnd assumed)

VSWR and Return Loss plot at height of 18 m (perfect gnd assumed) 13.8 - 14.6 MHz

VSWR and Return Loss plot at height of 24 m (perfect gnd assumed) 14.0 - 14.4 MHz
Note: fine tuned > DE plus 15 mm per side = 2 x 5300 mm, D1 plus 10 mm per side = 2 x 5105 mm

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Validation of Tapering

Tapered Yagi:

Average Gain with Aluminium T-6061 for Elements = 0.988 = -0.05 dB

Average Gain with zero wire losses = 1.000 = 0.00 dB

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73, Hartmut, DG7YBN