Abstract-Measurements of the complex impulse response of 900 MHz radio channels in mountainous terrain in British Columbia, Canada, are used to quantify values for the normalized scattering cross section 0 for mountains covered with evergreen trees. The bistatic radar equation is then used in a propagation model to predict characteristics of the impulse response in similar terrain from topographical data.Three-dimensional (3-D) propagation models for mountainous areas are important, because such areas stress to the limit the multipath handling capabilities of most air interfaces. 0 is related to a more fundamental characteristic of the surface via Lambert's law. The measured value of is −21.1 ± 2.9 dB, which is similar to some of the very few other values found in the literature. Using this value of , the predicted multipath delay profiles correspond well with measurements. The results can be used to predict complex impulse responses in mountainous terrain which may be convolved with a simulated data stream to predict error rate, outage or other aspects of wireless system performance.