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The effects from lateral variations of irregular terrain on the propagation of radio waves are considered by the representation of the vector fields in terms of two scalar Hertz potentials in spherical coordinates. The combination of three-dimensional parabolic equations for these potentials with an impedance boundary condition for the ground, followed by a transformation of variables, will define a boundary-condition problem characterized by equations displaying coefficients that depend on the terrain height function and its partial derivatives. The problem solution through the Crank-Nicolson scheme will lead to a sparse system of linear equations, which will be solved by a direct method. The resulting numerical model will be applied to test cases to show similar features to those from examples described in the literature, taken as references for validation purposes.