This has made small antennas more popular, despite some limitations. [Tech Minds] reviews the GA-450 indoor active HF loop antenna and finds it better than expected. You can see the video review ...

[K5ACL], aka [SignalSearch], recently brought his active receive loop antenna in off the roof to ... with noise sources that interfere badly with HF. So after spending a minute or so listening ...

HF results in pulmonary and peripheral edema due to a decrease in cardiac output and retention of free water by the renal tubules. This fluid retention causes dyspnea, orthopnea and fatigue ...

Abstract: In this paper, an RF-DC converter operating at 13.56 MHz (HF radio frequency identification (RFID ... reverse saturation current and improving the sensitivity. Fed by a loop antenna, the ...

Abstract: Far field patterns of large circular loop antennas of circumferences up to two and one-half wavelengths were calculated using Storer's theory for the current distribution on the antenna. To ...