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In this paper a realistic model that is an extension of COST 273 channel model, introducing terrain and clutter information into cluster generation, is presented. Our model is based on a geometrical/stochastic approach, and allows a realistic treatment of both cluster positions and dynamics. This is done by means of visibility regions. Using terrain and clutter information, the cluster and visibility region generating PDFs are derived. Some simulation results over a GIS tool for the city of Lisbon, Portugal, are presented.