DG7YBN / 144 MHz / YBN 2-12m
  Last Update Oct. 30th, 2026


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Performance Data and Geometry
Pattern and VSWR
Download as File
Stacking


YBN 2-12m  Yagi with straight Driven Element



A Yagi focussing on a clean pattern, high F/B with but good gain. The dipole is of same length as for the YBN 2-5m, 2-8m or 2-10m series. Dimensions for the folded dipole are same as well, the same WiMo made folded dipole can also be applied. Date of Design issue: 2026.10.20

YBN 2-12m current profile at 144,1 MHz

YBN 2-12m 3D pattern plot at 144,1 MHz




Performance Data

Specs: with 8 mm elements @ 144.1 MHz 

Gain vs. isotr. Rad.  15.53 dBi
Gain vs. Dipole       13.4 dBD
-3 dB E-plane         32.0 deg.
-3 dB H-plane         34.4 deg.
F/B                  -29.3 dB
F/R                  -23.9 dB
Impedance               50 ohms
VSWR Band Width       1.26:1 *
Mechan. Length        6778 mm + boom end offsets
Electr. Length        3.26 λ

Stacking Dist. h-pol. (144.1 MHz) 100 perc. of Dopt
top-to-bottom         3.518 m
side-by-side          3.774 m

*) as in VE7BQH G/T table = at 145.00 MHz


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Geometry


This Yagi with 8 mm elements on a 20 x 20 mm boom with standard insulators

Ele. 8.0 mm
DE 10 mm
Boom 20 x 20 mm 		 



"Ready to saw and drill" data for mounting elements on boom with BC according DG7YBN for standard insulators
as sold by WiMo, Tino's Funkshop, HF-Kits NL, 7arrays:


Includes an SBC of 1.75 mm


Note: with a boom 20 x 20 x 2 m this Yagi needs a supporting boom strut (!) and most likely guy wires if to be used in heavier wx.




This Yagi with 8 mm elements on a 25 x 25 mm boom with standard insulators

Ele. 8.0 mm
DE 10 mm
Boom 25 x 25 mm 		 



"Ready to saw and drill" data for mounting elements on boom with BC according DG7YBN for standard insulators
as sold by WiMo, Tino's Funkshop, HF-Kits NL, 7arrays:


Includes an SBC of 1.75 mm


Note: with a boom 20 x 20 x 2 m this Yagi needs a supporting boom strut (!) and most likely guy wires if to be used in heavier wx.

The Drivers diameter is 10 mm for all examples.
The EZNEC model is done with Auto-Segmentation at 380 MHz.



Sketch of Folded Dipole








Pattern and VSWR Plots

Elevation and Azimuth plot at 144.1 MHz

 


RL and SWR plots - simulated









Downloads

None so far.








Stacking 


Stacking Dist.  h-pol. DL6WU Formula (144.1 MHz) 100 perc. of Dopt
E-plane               3.774 m
H-plane               3.518 m

Plot and data of 2 vertically stacked YBN 2-7m using DL6WU stacking distances

Antenna View & Elevation Pattern

Same at 8.0 m for the lower Yagi over perfect ground


Plot and data of 4 in H-config stacked YBN 2-12m using DL6WU stacking distances Dopt


Elevation & Azimuth Pattern

 


AGTC Twain-JS analysis:









73, Hartmut, DG7YBN



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