A simulation model of multipath propagation will be used to characterize the relationship between the cross-polarization discrimination and the co-polar attenuation in frequency-reuse line-of-sight microwave links. The behavior of several links described in the literature will then be simulated, and the results will be compared with the corresponding measurements, to test the prediction capability of the model. A reasonable agreement between the corresponding results will be displayed. Further, it will also be shown that the cross-polar phase patterns of the antennas could significantly affect the behavior of the cross-polarization discrimination. ¿ American Geophysical Union 1993