OWA Yagis

G0KSC SC14415M 15el 144MHz OWA Yagi

Gain: 16.7 dBi
F/B: 27.21 dB
Elements: 15

Specifications

Performance

Gain: 16.7 dBi
Front-to-back: 27.21 dB
Elements: 15
Impedance: 50 Ω

Dimensions

Element dimensions

Element dimensions (parsed from legacy body — check before publishing)

Element	Position	Note
Ref	0 mm	parsed from legacy body — confirm position vs length
D3	1447 mm	parsed from legacy body — confirm position vs length
D4	2154 mm	parsed from legacy body — confirm position vs length
D5	2959 mm	parsed from legacy body — confirm position vs length
D6	3782 mm	parsed from legacy body — confirm position vs length
D7	4624 mm	parsed from legacy body — confirm position vs length
D8	5463 mm	parsed from legacy body — confirm position vs length
D9	6357 mm	parsed from legacy body — confirm position vs length
D10	7178 mm	parsed from legacy body — confirm position vs length
D11	8019 mm	parsed from legacy body — confirm position vs length
D12	8822 mm	parsed from legacy body — confirm position vs length
D13	9495 mm	parsed from legacy body — confirm position vs length

Modelled performance

Plots

About this design

G0KSC SC14415m 15el 144Mhz Yagi Antenna with a 9.5 Metre Length Boom

Premium commercial versions of this antenna at Innovantennas

Please read the whole page, If you do not see the diameter tubing you need to have this antenna designed in or require tapered elements, Email me!

This antenna has been redesigned and represents what I beleive to the the 'ideal boom length' for an OWA direct feed 50 Ohm Yagi with 15 elements on 144MHz. This can be seen in the model in the super flat SWR, the high levels of F/B ratio along with the excellent gain and very low-noise pattern.

The model below is designed with 12.7mm / 1/2 inch dipole and 8mm - 5/16 inch elements. If you require a version of this antenna with another diameter wire, Email me and I will remodel. It is NOT POSSIBLE to simply resize the elements when using a VERY different diameter wire and get the best performance possible, Spacing and element diameters MUST be re-optimised to reproduce the best antenna possible.

REMEMBER, Gain does not make the best antenna on 2m. F/B, SWR Banwdith, Pattern Stability, Side Lobe suppression, Sky Teperature and G/T all play a role. Choose an antenna based on gain alone and you will never know what you are missing (mainly weak signals) !!

This Antenna has been designed in order to provide amazing stability in all weathers; Rain, Ice and Snow. Little effect will be seen from close-by objects (including other antennas) and impedance is contstant. Losses are at an absolute minimum with this antenna ensuring long-term, trouble-free, any-time operating and usage.

Dimensions in Metres - all tubing 1/2 inch / 13mm diameter dipole and 8mm / 5/16 inch parasitic elements, mail for other sizes and tapered elements

Element spacing:

Ref = 0
Driven = .283
D1 = .403
D2 = .823
D3 = 1.447
D4 = 2.154
D5 = 2.959
D6 = 3.782
D7 = 4.624
D8 = 5.463
D9 = 6.357
D10 = 7.178
D11 = 8.019
D12 = 8.822
D13 = 9.495

Element sizes per element half:

Ref = .512
Driven = .5025 (.503 for 12mm dipole)
D1 = .478
D2 = .470
D3 = .4605
D4 = .4525
D5 = .4465
D6 = .441
D7 = .4375
D8 = .432
D9 = .4255
D10 = .422
D11 = .4215
D12 = .4195
D13 = .4145

Note: ALL elements 8mm (5/16inch) dipole is 1/2 inch with 12mm dipole figures in brackets.

Performance figures @ 144.300Mhz:

Froward Gain: 16.70dBi free space
Front to Back: 27.21dB
SWR Bandwidth - 1.5MHz below 1.1:1

Sky Temperature @ 144.100MHz = 227.6 Kelvin

G/T @ 144.100MHz = -6.87dB

Stacking information:

Vertical Stacking - 4.16M

Horizontal Stacking - 4.2M

Sky Temperature (4 antennas) @ 144.100MHz = 223.7 Kelvin

G/T @ 144.100MHz = -0.90dB

4 x Gain - 22.24dBi

Azimuth Plot

Elevation Plot

This fantastic antenna at 12m up

An Excellent SWR to go with the fantastic pattern!

Remeber, mail me if you have different diameter tube requirements and send photos of built antenna!