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The space borne microwave radiometer will have a lowest frequency in the C-band. We have to prepare the use of this band to estimate the soil moisture. This paper consider the case of sparsely vegetated areas encountered in semi-arid area. This paper is based on the HAPEX-Sahel data set. We show that the single scattering albedo could be neglected at C-band when the amount of vegetation is low. The vegetation transmission coefficient can be estimated from the polarization difference at 5.05 GHz and an angle of incidence of 45 degrees. However the obtained relationship needs to be tested in various wetness conditions.