70 Cm ( 430 Mhz ) Yagi beam.

This page shows a 7 element, Yagi beam antenna built out of spare parts for the 70 CM band.

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The below image is the measurements of the antenna. It shows the size and position. Don’t forget the Driven element ( red ) is cut in the centre.

70cmyag

The boom, plastic inserts are all from a broken TV antenna. The elements are from an old broken fishing rod stand. It is all aluminium.

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The below image shows the Driven element and balun housing with a reflector.

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This is a close up of the balun box, SO239 and driven element. The green box is salvaged from an old TV antenna.

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The Yagi has a balanced driven element but is fed by unbalanced coax. To make sure it works correctly, we need to convert from one to the other. I have chosen to use a coax balun. Which can be seen below. It is very simple. There are other options.

balun

For more technical information about this Antenna, you can find a very impressive write up here ( not my work but a big thank you for it ) : https://ejo60.wordpress.com/2016/02/23/seven-element-70-cm-yagi-antenna/

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