Category Archives: Antennas

ChatGPT designs a Fan DiPole

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I asked ChatGPT the following: Design a fan dipole antenna that covers 80, 40,20 and 10 meter bands. Give all the specs and measurements. ChatGPT said: Designing a multi-band dipole antenna to cover the 80, 40, 20, and 10-meter bands … Continue reading →

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Difference between HF, VHF and UHF

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HF, VHF, and UHF are different frequency ranges used in radio communications. Each range has unique characteristics that make it suitable for different types of applications. HF stands for High Frequency, which covers the frequency range from 3 to 30 … Continue reading →

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Antenna dB – The basics

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Antenna dB (decibels) are a unit of measure used to describe the gain, or amplification, of an antenna compared to a reference antenna. Decibels are a logarithmic scale that expresses the ratio of two power levels, and they are commonly … Continue reading →

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Isotropic antenna

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An isotropic antenna is a theoretical antenna that radiates equally in all directions, with a radiation pattern that is completely symmetric around its axis. It is often used as a reference antenna in radio frequency (RF) engineering to compare the … Continue reading →

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Understanding Antenna Gain in a Few Minutes

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I often enjoy reading on a topic and then try to summarize it in a short article on this website. But today isn’t the case. Sometimes a simple instruction video does a much better job than all the words I … Continue reading →

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Understanding directional antennas

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I stumbled on a great video on the internet which shows exactly how a Yagi directional antenna works. This video was produced by MakeMagasine.com and presented by Diana Eng. In short order, it demonstrate how a dipole antenna transfers energy … Continue reading →

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The 80-40-20-10 meter fan-dipole project

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This is the Alpha-Delta DX LB Plus I want to replace. At the beginning of summer 2012, I designed and built a 3 band fan dipole. I was so happy with the results that I decided to try the same … Continue reading →

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The 20-17-15 meter fan-dipole project

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For over a year, I’ve been using commercially bought antennas, one of which is a 160m-10m multi-band Alpha-Delta DX LC Plus. During that period of time, I had the chance to study this multi-band antenna and began figuring how it … Continue reading →

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SWR analysis of a Alpha Delta DX LB Plus antenna

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This article will show you SWR analysis of an Alpha-Delta DX LB Plus antenna installed 40 feet off the ground in an inverted-V configuration. The antenna ends are approximately 15 feet from the ground. I explained in details the tools … Continue reading →

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SWR analysis of a G5RV antenna

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For the past few months, I’ve been tinkering with the idea of improving my current antenna situation, which includes a full length 102′ G5RV (10m-80m) installed horizontally at approximately 42 feet. In order to proper install and tune new antennas, … Continue reading →

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