DG7YBN / 28 MHz / YBN 28-5L
  Last Update Dez. 3rd 2023


Performance Data and Geometry
Pattern and VSWR
With Ground Gain
Building Details

YBN 28-5L   with straight split Dipole

CW + SSB band 28.0 to 28.7 MHz

A full size 5 element Yagi on 8.3 m boom plus front and rear offsets that covers 28.0 - 28.7 MHz with a VSWR < 1.25.
This Yagis feedpoint impedance is 50 ohms.

Design date of issue: 2023.10.03

YBN 28-5L built by Fabio, HB9FAP
here /p with 2 x YBN 28-5L for the CQ WW ctest on the Kronberg in the Appenzeller Alps in HB9, 1660 m AGL.

Click on image to enlarge

Current distribution

All elements 16 mm version:

Performance Data (28.3 MHz, el. 16 mm)

Gain vs. isotr. Rad.  10.41 dBi
Gain vs. Dipole        8.3 dBD
-3 dB E-plane         53.8 deg.
-3 dB H-plane         70.4 deg.
F/B                  -23.6 dB
F/R                  -19.0 dB
Impedance               50 ohms
Mechan. Length        8300 mm ex. boom offsets
Electr. Length        0.78 λ

Stacking Dist. h-pol. (28.3 MHz)
top-to-bottom          approx.  9.2 m
side-by-side           approx. 11.7 m


• For building on a 40-50 mm boom, 16 mm elements insulated with hydraulic clamps like from co. Stauff:

Taper version, elements 20 > 16 mm:  

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Pattern and VSWR Plots

Elevation and Azimuth plot at 28.3 MHz


SWR and Return Loss plots - simulated with 4nec2

Quick VSWR plot check by HB9FAPs friends w. AA-230 Zoom, antenna height 8 m AGL:

3D pattern

Radiation pattern with Ground Gain

At 12 m above perfect ground

At 12 m above perfect ground

Gain vs. isotr. Rad.  16.1 dBi at  12 deg.
Gain vs. Dipole       14.0 dBD
Gain vs. isotr. Rad.  12.3 dBi at  39 deg.
F/B                  -22.6 dB  at 169 deg.

At 17 m above perfect ground

At 17 m above perfect ground

Gain vs. isotr. Rad.  16.3 dBi at   9 deg.
Gain vs. Dipole       14.1 dBD
Gain vs. isotr. Rad.  14.7 dBi at  27 deg.
Gain vs. isotr. Rad.   9.4 dBi at  48 deg.
F/B                  -23.1 dB  at 172 deg.

Building Details

HB9FAP tributed these buildng detail photos:
Element mounting:

Dipole mount:

Feed, Balun 1:1:


to come soon ...

73, Hartmut, DG7YBN

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