127 - Yagi Antennas

Do you want to understand how a Yagi antenna works?

In this episode, Phil explains the elements of a Yagi antenna, what they’re used for, and even how to build your own.

What You Need To Know

• Shintaro Udo and Hidetsugu Yagi created the antenna.
• A Yagi antenna is a directional antenna with at least two elements, usually three, mounted on a boom.
• The main element is the boom, where everything else is mounted.
• A Yagi usually includes a driven element, a reflector element, and a director element, all mounted on the same plane.
• The driven element is the main element, and it is what your feed line is connected to.
• Next, behind the driven element, you have the parasitic element called the reflector, and in front, you have the director element.
• The different elements are positioned to interfere with each other in a way that enhances the radiation and increases the directivity of the antenna.
• The longest element always sits behind the driven element, and that’s how you know which is the front and back.
• A Yagi can be used to pick up signals far away from you
• You can use a Yagi antenna to try to overcome simulcast issues.
• Yagi antennas are typically built for a very small range of frequencies.
• You can get a cross-pole Yagi antenna, which is very popular with amateur radio and using satellites.
• It is possible to build your own Yagi antenna with some basic materials.

All session notes with links to the items we talked about an be found on our website at www.scannerschool.com/session127

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