[Tech Minds] reviews the GA-450 indoor active HF loop antenna and finds it better than ... but it worked nicely at higher frequencies. The loop is directional and you can rotate the loop on ...

when coupled with the directional variability of antenna gain, can lead to marked changes in noise outcome between different antennas. The implication of directional varying noise for the optimum ...

However, creating directional antennas allowed more stations to share channels and that’s the subject of a recent post by [John Schneider]. When it comes to antennas, ham radio operators often ...

Abstract: The northerly ionosphere is a dynamic propagation medium that causes HF signals reflected ... Such large directional spreads may have a severe impact on radio systems employing multielement ...

Heliospace, a subsidiary of Helio Corporation has announced the successful deployment of the radar antennas aboard the NASA Europa Clipper spacecraft.

The system has overlooked and measured surface currents and directional wave spectra ... a grid of a predetermined resolution. WERA HF systems improve upon CODAR as they make use of a high number of ...