HamCQ This article was originally published in 2020 as part of the HamZone community's trial run and has been reprinted from. @BH2RSJ As shown in the diagram, this is our most common UV frequency antenna, a GP antenna. It's a monopole antenna, which is simple and effective. It consists of a 1/4 wavelength main array. Because our everyday handheld radios act as ground wires, we don't usually see the four ground wires in the diagram. However, please note that the ground wire has a significant impact on the performance and transmission efficiency of the GP antenna. To create an antenna similar to the last three images, consisting of one boom and four ground wires, with a length of 1/4 wavelength (assuming it's for the UHF amateur band, this 1/4-wavelength electrical length should be 165mm). With this size, the antenna can be constructed with minimal adjustments. When using the antenna, keep it away from the ground; ideally, mount it overhead. Some newcomers see this and immediately ask why a simple antenna like this costs tens or hundreds of dollars, while finished products like "Diamond" or DIY antennas cost so much. There are several reasons for this: First, you rarely see bare antennas; antennas need an outer shell, which is usually made of rubber. Making one yourself is difficult. For commercial antennas, there's also the issue of strength and durability to consider. Finally, there's the time and labor costs involved. So, expensive antennas aren't just about ripping people off. ------------bh2rsj - typed, QQ: 863077530
BH7CNC_Jack Congratulations to the original poster, SWR testing was successful! However, it's best to have a test environment for UHF antennas (yes, I'm referring to the impact of reinforced concrete buildings).
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