Build your own 2m/70cm 3 Elements VHF by 5 Elements UHF Yagi antenna with excellent gain for both VHF and UHF operation. This antenna is designed for amateur band frequency for both VHF (2m) and UHF (70cm). The antenna has good reflection coefficient and VSWR ratio @ 1.2:1 at center frequency and 1.7:1 at band edge.

### Antenna Specs from 4Nec2

VHF Gain: 7.25dBi @ 145Mhz

Beamwidth: 114° degrees

Front to Back Ratio: 14.1dB

VSWR: 1.0:1

UHF Gain: 10dBi @ 440Mhz

Beamwidth: 60° degrees

Front to Back Ratio: 14.4dB

VSWR: 1.2:1

### Building Video 3 Elements by 5 Elements 2m/70cm Dual band Yagi including Tuning

### Material list for 3×5 Elements Dualband Yagi

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. 2pc SO239 connector

5. Pop rivets / Rivet tool

6. #12 AWG Copper wire with insulation (12″for Gamma match)

7. Soldering iron

8. 10pcs Stainless steel nuts and bolts 20mm length 3mm diameter

9. 1pc, Butterfly nut and 1 bolt 18mm length 3mm diameter

10. Aluminum plate 0.5mm thickness

11. 4 X 2″ Aluminum tube for bracket

12. Collapsible tube (shrinkable tubes)

### Gamma Match for Dualband Yagi

sir, if sell it “Build the 3 x 5 Elements 2m/70cm Dualband Yagi” baka puwede mo akong pag bigyan, bahala padala mo lng, pre-fubricated ako nalang ako nalang mag rebits. puwede email mo ang presyo, new hoby po sir 73

I sent a reply email to your account cheers!

Gudpm po. Optimized po ba itong dual band antenna design nyo pag gagamitin as CrossBand repeater?

Hi optimize yan basta gagamitin mo sa designed frequency nya.

hi. i like your antenna . I am new on ham world , i have a question : any form to calculate Phasing harness for your yagi antenna ,

thanks from MEXICO XE2MBJ .

Hi Alberto, phasing harness computation is always (odd multiple of quarter wavelength X velocity factor of coax) use 75ohms coax for the phasing line cheers!

Good day sir,pwede ba makahingi ng sample para sa computation ng phasing harness?d ko kasi maintindihan.maraming salamat.

To compute for the phasing harness, it’s 1/4 wavelength of the center frequency * VF (Coax Velocity Factor * odd number multiple, i.e (Antenna Center Frequency is 145Mhz get the 1/4 wavelength of 145Mhz, its equal to 19.4 inches or 49.276cm multiplied by coax velocity factor taken from coaxial cable datasheet of 75ohms RG59, (Phasing harness are usually constructed from 75ohms coax) example here >>> https://dw1zws.com/product/endura-75-ohm-coaxial-cable-rg59-sdtcw/ with 85% velocity factor multiplied by odd number multiple ( this is to cover distance separation if you are stacking antenna) so to continue 49.276cm * 0.85 * 1 = 41.88cm (length of phasing harness you can extend the length by multiplying it with any odd number 3,5,7 etc. to cover your desired length.

https://youtu.be/zRAbiFvHGlw <<< check this out on my youtube.

This page was so full of ads that it was impossible to use.

Thanks for the comment, but you are free to look for any resource you need outside of this website. I don’t receive any contribution to run this page from anyone, so that helps in maintaining the servers and continue sharing the content for free. Have a wonderful day cheers 73!