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The backscattering coefficients of wet soil surface are studied with the 3-dimensional numerical simulations of Maxwell equations. To improve the accuracy of the simulations, we have recently used the RWG basis functions. Using the simulation results, we study the angular, frequency, and polarimetric dependence of the scattering from different rough surface spectra. The simulation results are compared with the backscattering coefficients at L and C frequency bands and at the multi-incidence angles. The fairly good agreements are observed for the fixed physical surface roughness parameters at two frequency bands.