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.

A mechanically-tuned electrically small loop antenna for HF use is proposed. The antenna is composed of a tuned outer loop that is inductively coupled to a smaller coaxial loop. Measurements taken at ...

However, electrically small antenna simulation is now possible with the increase in computational power, non-uniform meshing algorithms, and finite element techniques. This paper discusses the ...

At present, portable receivers generally use ferrite rod antennas for LF and MF (below 2 MHz), and whip antennas for HF (up to 30 MHz). Each type has proved effective in its particular application ...

At present, portable receivers generally use ferrite rod antennas for LF and MF (below 2 MHz), and whip antennas for HF (up to 30 MHz). Each type has proved effective in its particular application ...