— Wave Propagation — A large number of things—some desirable, some not—can happen to a radio wave on its way from one place to another.

The exercise challenges competitors with voice and data contacts between domestic and international teams via HF sky-wave propagation.

The strength of the low-angle sky waves radiated by a medium-frequency aerial depends on the conductivity of the ground extending for many wavelengths in the direction of propagation. The field ...

Researchers have mathematically elucidated how the presence of crystals and gas bubbles in magma affects the propagation of seismic P-waves. A novel equation was derived to describe the travel of ...

Ten years ago, researchers succeeded in suppressing sound wave propagation in the backward direction; however, this also attenuated the waves traveling forwards.

Whether using sky wave propagation or a close range network utilizing ground waves, HF communication is proving to be a practical solution in growing use by contraband smugglers, pirates and ...