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A new model for predicting fade duration statistics has been developed using a large database compiled for this purpose. Two lognormal functions have been used to model the short and long fade durations due to scintillation and rain events, respectively. The performance of the new model has been compared with existing prediction models such as the ITU-R, COST 205 and Dissanayake-Haidara (D-H). The test results show that the new model has the best performance at Ku, Ka, and Q/V frequency bands. In addition, when results for all the data available are considered, the new model gives the best prediction on average, followed by the D-H, COST 205 and the ITU-R models, respectively.