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I think my passion for good receivers (antennas) is already well known. I have written many times about the use of additional receivers and antennas in amateur radio. And I have probably already written more than once about radio engineering means of improving reception and combating interference. As a lemma to this post, read and watch (because there are two videos :-) here. But not everyone has a couple of hectares for an antenna field, and sometimes there is no possibility to hang something classic at all. On the other hand, there is a purely sporting interest in the idea implemented by LZ1AQ - an antenna operating in short-circuit mode. Two or more frames are connected in parallel to achieve minimal resonant properties, while the dimensions cease to have any meaning, and then the signal is fed to the receiving path using a differential amplifier. The main advantage of such an antenna is an almost table-shaped characteristic from tens of kilohertz to hundreds of megahertz. Just imagine - one antenna for all ranges :-) But the gain of such an antenna is -3 dB. Therefore, the use of a diff amplifier is mandatory. Read more - https://gosh-radist.blogspot.com/2024... Continuation - https://gosh-radist.blogspot.com/2024... Semi-final - https://gosh-radist.blogspot.com/2024...