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This work describes theoretical mobile propagation model and simulation for horizontal and vertical polarization for different types, size and shape of vegetation or trees. Horizontal and vertical attenuation values for different kind of leaves, trees and branches, as a contribution to total attenuation are obtained and contribution of each elements are assessed. Finally a comparison is done between 900 MHz, 1800MHz and 2270 MHz. The difference in path loss between the three frequencies has been analyzed for park environment. The result shows that the loss from vegetation is substantially higher for the higher frequencies.