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 ...