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Portable 3 EL 70cm Band Yagi

Hello everyone. Want to share my recent project of 3 el yagi for 70 cm band. It’s very light, portable and great for backpacking and hiking.
I like to hike and want to have only necessary equipment with me. I have decent portable equipment for HF which is IC-703+ and set of J-pole antennas.
Many HAMs use a small handled VHF/UHF radios but unfortunately the original antenna is very bad and not efficient. It cause bad communication or radio overheating.
I decided to make one antenna that I can handle and have with me every time when I hiking or backpacking.
The antenna should be:

  • – light
  • – small or foldable
  • – have a good performance

Finally I found a solution and made this antenna. It met all my criteria. I got a ultralight, foldable and portable pocket size antenna with decent performance.

Frequency: 436.00 – 445 MHz with SWR 1:1.5 – 1:1:1.5 and 1:1.1 on 440 MHz.

Gain: 7 dBd 

Weight : less than 12 oz

I used a material that had in my garage, there is nothing special or expensive. The boom is a simple fishing rod that I bought  on eBay for HF projects. The antenna elements made
from 1/8″ (3.18 mm) brass rod. You can find them from K&S Engineering store. Simply drill a two holes, one for reflector another for director. The driven element can be just zip tied to the boom.
The important step is tuning. At least you have find a position of driver element whenever you get a lowest SWR on central frequency (the antenna can be tuned ether for SSB or FM). Personally I use this particular antenna only for FM, repeaters and satellites. As you can see on photo, I’d attached my cheap chinese radio directly to the boom.




Download in high resolution here or in PDF

Feel free to ask me if you have questions.

Alex K6VHF


4 Responses to “Portable 3 EL 70cm Band Yagi”

  1. Alex,
    The image for the yogi doesn’t load as the is too high for your hosting provider – maybe you can mail it to me?
    73 es merry Xmas!
    Willi OE1WKL

    Posted by Willi | December 23, 2014, 2:25 pm
  2. Hi,
    The DE is a folder dipole. Should a 4:1 balun added to the feed point?

    Posted by Jeff | December 10, 2015, 5:29 pm
  3. looks great
    how about cris crossing two orings to secure the beams

    let us know how your dual band project is going
    i would like to build one myself


    Posted by sven | February 19, 2016, 5:04 pm

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