Multipath fading is the main cause of performance degradation in high capacity line-of-sight microwave links, increasing enhancing the effects of the thermal noise and intersymbol interference in the bit error rate. Tested methods are available in the literature for the prediction of cumulative probability distribution multipath fading in individual link but not in a microwave network formed by several tandem links. Measurements carried out in Brazil indicate that the usual assumption that deep fade events in consecutive links are totally uncorrelated may be pessimistic for tropical regions and may lead to the prediction excessive multihop links unavailability. Experimental data obtained in measurements of multipath fading in 15 pairs of tandem links located in the center- western region of Brazil were analyzed to provide cumulative distributions of attenuation in each pair. Similar results are available in the literature for 5 pairs of links in Japan. Based on these results, an empirical model was developed for the prediction of the joint probability distribution the multipath fading in adjacent links was developed. The attenuation simultaneously exceeded in both links for given percentage of time can be predicted as a function of the equiprobable values of attenuation exceeded in the individual links, path lengths and operation frequency. The predicted distributions show good agreement with the experimental results and provide an expression for the calculation of unavailability of line-of- sight tandem links. The experimental data had been used still to model the duration of events of attenuation for multipath of links in visibility. One revealed that the distribution of duration of events well is characterized by distributions of Weibull. This characterization allows the distinction between events of loss of quality (lowest duration at 10 seconds) and of non-availability (higher duration the 10 seconds).