This document followed on an earlier publication titled "Transmission loss predictions for tropospheric communication circuits", P.L.
The Longley–Rice model was proposed for frequencies between 20 MHz and 20 GHz for different scenarios and different heights of transmitting and receiving antennas.
This model uses statistical resources to compensate for the characterization of the channel, which depends on the variables of each scenario and environment.
The variation of the signal is determined by the prediction model according to the atmospheric changes, topographic profile and free space.
The reference attenuation defined as a function of distance also features 3 ranges for prediction: I) line-of-sight; II) diffraction; III) scatter.