They’re less popular among radio listeners only because they typically have a very narrow bandwidth and need to be re-tuned (via a variable capacitor) each time you move frequency even a few kilohertz. Passive loop antennas are popular among ham radio operators because they’re easy to build and, unlike amplified loop antennas, one can transmit into them if designed correctly.These loops do require a power source, typically fed through a Bias-T or batteries. Unlike passive loop antennas, wideband amplified antennas require no manual tuning. The most popular among SWLs are wideband amplified loop antennas manufactured by companies like Wellbrook, Chameleon Antenna, MFJ, DX Engineering, Cross Country Wireless, Bonito, and a number of manufacturers in China. Mag loops come in a wide variety of configurations: When oriented vertically, mag loop antennas can also be rotated to null out unwanted signals on lower frequencies. I’ll be painting in broad brush strokes, but here you go: If you live in an environment with a lot of radio interference…īy design, mag loop antennas are some of the best antennas for mitigating the radio frequency interference (RFI) that plagues so many of our homes and neighborhoods. I started to write a slightly more comprehensive article about this, but I quickly realized I want to keep my advice as short and clear as possible. I realize that there’s a common theme to my answers and I thought it might be useful to share it here on the SWLing Post for future reference. Obviously, most of the questions come from shortwave radio listeners, but some have come from ham radio operators as well. In the past few weeks, I’ve gotten a lot of questions from readers who are trying to decide if they should install a magnetic loop antenna or a simple wire antenna at their home.
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March 2023
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