Studies in tropospheric propagation beyond the horizon

This paper describes an extended series of experiments in beyond-the-horizon propagation on a 171-mile overland path using 460 and 4110 mc. The following aspects of the propagation were investigated: the effect of antenna size on signal level and fading characteristics, wavelength dependence, seasonal and diurnal effects, a new form of diversity reception, the bandwidth capability of the medium. Many of the experiments were directed toward a better understanding of the mechanism of propagation.