The Yagi

One of the most used and most well known antenna’s

Invented by Yagi-Uda in Japan the Yagi is a Directional antenna, the Yagi exhibits more gain than any other antenna, and some amateur Yagis have many directors.

That said optimal spacing is the key, some of the biggest stations use seven element beams with massive boom lengths to achieve great results.

Yagi antenna’s can also be used in another way to most, they can have the elements crossed (Forming an + shape) both fed independently, giving a horizontal and vertical polorisation, but as well as that by using a phasing harness you can clockwise and anti-clockwise polarize the antenna for Satellite work or EME

The theory is quite straight forwards for designing them, I will not even try but instead direct you to this website

In keeping however with the rest of the site I will give the following based on a 5 element 144 Mhz beam, in free space.

144Mhz Yagi SWR

144Mhz Yagi SWR

144Mhz Yagi Far Field Plot

144Mhz Yagi Far Field Plot

144Mhz Yagi Far Field Plot

144Mhz Yagi Far Field Plot

Practical Antenna Design 140-150 MHz VHF Transceivers Third Edition (Kindle Edition)

This authoritative and well-researched book is the only one that will give all of the most important and reliable on VHF antenna construction techniques.

This unique book offers a superb collection of detailed, easy-to-follow, fully illustrated, and tested designs, covering such types of antennas as: omnidirectional antennas, gain-omni antennas, gain-directed beams, portable antennas, Yagi antennas, stacked arrays, stacked collinears, wideband-omni antennas.

Packed with detailed drawings, plans, schematics, instructions, material lists, formulas, tips and tricks.

Plus, the reader is given and extra chapter on converting the designs for other frequency bands, making it profitable not just for amateurs, but for professionals as well.

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