Material list for building a 4 Elements Yagi
- 1″ X 0.5″ Rectangular Aluminum tubing for the boom
- 3/8″ Aluminum tubing for antenna elements
- 1cm Outside diameter antenna tubing for elements holder
- 1pc SO239 connector
- Pop rivets / Rivet tool
- #12 AWG Copper wire with insulation (12″for Gamma match)
- Soldering iron
- 8pcs Stainless steel nuts and bolts 20mm length 3mm diameter
- 1, Butterfly nut and 1 bolt 18mm length 3mm diameter
- Aluminum plate 0.5mm thickness
- Collapsible tube (shrinkable tubes)
To build the 4 Elements Yagi you may follow the direction for building the 3 Elements Yagi except that you will add an additional parasitic element (director) which is about 5% shorter than the last element of the 3 elements yagi. The spacing are the same between the elements and when built successfully it will give you a very desirable 9.39dBi gain or about or about 7.24dBd.
To increase the performance you may also configure the antenna in stack configuration by making two antenna’s and connect it with a phasing harness for increased performance.
Antenna Gain Simulation and Signal Pattern Using 4Nec2 antenna modeling.
Front to Back Ratio: 9.92dB
Antenna Gain: 9.39dBi
Beamwitdh: 70° Vertical 54° Horizontal
7 replies on “Build a 4 Elements Yagi”
Thank you sir for this design… Napaka ganda at very light wieght i used round aluminum tubing to save na din sa mga scraft ko dito.. i hit 1.3 on the swr meter at 145.000Mhz and i tried to radio check this yagi approximately 35km away from my location scaling sugar 5 at 4 ft above d ground.. Once again sir thank you for this yagi design..
You are very much welcome po, thanks for your feedback on your successful build. 73!
Will try to do this. Thank you for sharing
Good luck with your build Thresh 73!
sir, okay sa alright, glad to see builders of yagi home brew antenna, reminds me of my years in amatuer radio… way back from the 1990’s to early 2000… planing to be back on air with my antique radio shack… good job sir this will help newbies to learn ham radio… 73’s. with the call dw2rvn from the club station dx2alarm…
Thanks Roberto, hope to catch you on air someday and thank you for looking into the website. 73
Pakopya po ako Sir! Maraming salamat sa disenyong ito. More powers and more sales to come. Take Care!