tudoubocai Please read my post; however, I'm just a beginner, so you might find it helpful as a reference. Once you understand the situation, everything becomes simple.
bg7xwf This calculator is outdated. If you want to build your own Yagi antenna, I recommend checking out the website of DK7ZB. https://www.qsl.net/dk7zb/70cm/70cm-kurz.htm
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