Improving the treatment of mixed-terrain paths of the recommendation ITU-R P.1546 for the path-loss prediction of short UHF links

The recommendation ITU-R P.1546 provides a "method for point-to-area predictions for terrestrial services in the frequency range 30 MHz to 3000 MHz" an has been proposed to mitigate known limitations associated to distance and frequency ranges, combining several existent methods in one. In the present work, we suggest an improvement in the recommendation for the treatment of mixed-terrain paths, based on the intersection of the Fresnel\´s ellipsoid with the terrain profile.