Jim, a longtime customer of ours, sent us an email and some pictures of a new antenna he built! But it’s not just any antenna, it’s a Yagi-Uda antenna! We’ve got his letter, and a video from another Online Metals customer on how to build one below.

I build custom antennas to receive over-the-air (OTA) free high-definition television (HDTV). In this economy, building an antenna system rather than renting one at $80 per month makes a lot of sense to a lot of people. Also, cable and satellite signals are compressed and they are not quite true HD — but OTA is true HDTV and even my old eyes can see the difference.

These pictures are from my “Project-48” antenna, which I built using materials from Online Metals. I engineered this antenna specifically to capture our local (Seattle) KING TV channel 48. Hence the name.

I used .75″ aluminum square tube as the main boom. And I used .125″ aluminum round bar for the directors and feed point.
On its first test, not only did it capture KING on channel 48, but some others broadcast by KING on adjacent frequencies as well. It also captured 8 more HDTV channels, making my personal total viewable free HD channels 30…  so far.

I am now designing “Project 38” intended to capture KOMO news on channel 38. And it should do double-duty, and pick up KIRO news on channel 39.
Thanks for the fast help. I will be back to order again very soon,


DIY Yagi-Uda antenna?

This style of antenna is interesting because they are extremely powerful and simple to build. But they are fairly complicated to make sure that they work correctly. This longtime customer of ours uploaded a DIY video a few years ago that goes into detail on how to make one.

How does it work?

Honestly, its pretty technical. But in short, a Yagi-Uda antenna is a directional antenna designed to focus on a fairly narrow range of radio, radar, or television signals. Because of this it’s also sometimes called a Beam antenna. The numerous wires you see, called directors, absorb then reradiate the signals. Then the rounded wire, called the feed point, picks up these signals and transmits them into the hardware its connected to.

Here’s a bit of trivia; the name of the antenna derives from its inventors. Professor Shintaro Uda, and his assistant Hidetsugu Yagi designed it back in 1926!

Would you like to know more?

Aluminum is popular for outdoor antennae due to its corrosion resistance, low cost, and ease of working. But did you know it’s also pretty easy to weld aluminum?

We’ve got this information and more here on the blog.

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