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ABSTRACT
The paper describes the results of observations over three transhorizon radiopaths. The observed data during significant stratifications in the upper air show considerably low path loss as compared to long-term median transmission loss predicted by CRPL method. The dependence of transmission loss on layer characteristics of the troposphere is discussed and a method for prediction suggested. The signal level determined from reflection theory for large layers has been found to agree with observed level during occurrence of large elevated layers. A simple approach towards system planning based on these results is briefly indicated.