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A new method of solving the problem of diffraction of EM waves by the smooth crest of a perfectly reflecting cylindrical mountain has been previously reported. This paper presents the results in a form more suitable for practical applications. The theory is extended, and good agreement with model experiments is obtained for scattering angles up to 5 degrees. The procedure for including the effects of reflections from the ground on either side of the mountain is also indicated. A few examples illustrate cases encountered in practice, and exhibit effects up to 8 db compared with knife-edge diffraction.