A 40 Meter Magnetic Loop With Semi-Automatic tuning by WA2FZW Version 1.2 This project describes the construction of a homebrew 2-turn 40 meter magnetic loop antenna and the semi-automatic remote ...

[Tech Minds] reviews the GA-450 indoor active HF loop antenna and finds it better than ... it was able to pick up quite a bit of signal on the 40 meter and 20 meter ham bands.

[DXCommander] shows us his 40 meter two-element vertical antenna build in the video below. A typical Yagi is just a dipole with some slightly longer or shorter elements to direct or reflect the ...

In the case of aircraft loop antennas it is necessary to satisfy three important requirements. The first requirement is that a loop antenna form a highly efficient portable antenna; the second, and ...