tropospheric propagation due to diffraction by the spherical surface of the Earth, or more generally by any rounded obstacle which is extremely large in relation to the wavelength NOTE - Spherical diffraction may result in trans-horizon propagation. Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-05-51
tropospheric propagation due to diffraction by the spherical surface of the Earth, or more generally by any rounded obstacle which is extremely large in relation to the wavelength NOTE - Spherical diffraction may result in trans-horizon propagation.