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Information can be sent effectively if enough bandwidth is provided in troposcatter microwave communication link. Correlation bandwidth of a system is related to the path delays due to the rays travelling through the two extremes of the scattering volume. The radioclimatology influences severely the correlation bandwidth of the transhorizon microwave communication links. The correlation bandwidth problem is found to be more when the atmospheric stability is of low order. The problem of correlation bandwidth is less over the Indian coast and moderate over the northern plains while it is severe over the desert. It is also observed that depending upon the effective earth’s radius factor, there is a critical antenna diameter for a given frequency beyond which the correlation bandwidth problem disappears essentially. The increase in transmissible bandwidth is directly proportional to the antenna gain degradation in a system. It is needed to compromise for optimizing the above two parameters for a system.