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Mobile radio planning requires the accurate prediction of electromagnetic field strengths over large areas and in a wide variety of environments. This present approaches to predicting field patterns present a similar behavior about the main trend in field attenuation. However, they do not give numerically or analytically exact results. The spectral acceleration forward-backward (FB/SA) is an integral equation based numerical method that obtains the exact scattering data over very undulating terrain profiles with a computational cost of O(N). In this paper, the propagation and coverage analysis problem over different terrain profiles is explored using the FB/SA. In addition, the exact solution is compared with some popular propagation models.