4 Elements Yagi UHF 70cm antenna at 409Mhz

70cm 4 Elements Yagi @ 409Mhz usable frequency 406-412Mhz

Antenna specifications
Antenna Bandwidth: 406-412Mhz
Antenna gain @ center frequency: 7.16dBi
Beam width: 66° Horizontal / 108° Vertical
Front/Back ratio: 14.4dB

4 Elements Yagi 70cm UHF Antenna Materials List

1. 1″ X 0.5″ Rectangular Aluminum tubing for the boom
2. 3/8″ Aluminum tubing for antenna elements
3. 1cm Outside diameter antenna tubing for elements holder
4. 1pc SO239 connector
5. Pop rivets / Rivet tool
6. #12 AWG Copper wire with insulation (12″for Gamma match)
7. Soldering iron
8. 8pcs Stainless steel nuts and bolts 20mm length 3mm diameter
9. 1, Butterfly nut and 1 bolt 18mm length 3mm diameter
10. Aluminum plate 0.5mm thickness
11. Collapsible tube (shrinkable tubes)


Antenna Measurements

4 Elements Yagi 70cm 409Mhz dimensions
4 Elements Yagi 70cm 409Mhz dimensions

Download the PDF document here

Build the gamma match for this yagi here. Although the gamma match is originally for 3 elements yagi antenna UHF this will also work with this 4 elements UHF yagi antenna.

Expected antenna pattern generated using 4NEC2

Antenna combined pattern

Horizontal pattern

4 Elements Yagi 70cm 409Mhz
4 Elements Yagi 70cm 409Mhz horizontal pattern

Vertical Pattern

4 Elements Yagi 70cm 409Mhz
4 Elements Yagi 70cm 409Mhz vertical pattern

Antenna Pattern on the low band 406Mhz

No skewing detected on the antenna pattern as generated by 4NEC2

4 Elements Yagi pattern @ 406Mhz
4 Elements Yagi pattern @ 406Mhz

Antenna Pattern on the high band 412Mhz

Minimal skewing on the 412Mhz antenna pattern as generated by 4NEC2

4 Elements Yagi pattern at 412Mhz
4 Elements Yagi pattern @ 412Mhz minimal skewing on the pattern generated by 4NEC2

Complete Antenna Analysis using NanoVNA and N1201SA antenna analyzer



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