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The 3D vectorial Gaussian beam tracing method is used to model a short 62.4-GHz link in a simple urban environment. First the Gabor expansion method with a wide-waisted window function is utilized to expand the known far field pattern of the transmitter antenna into a set of Gaussian beams and then these beams are propagated in space until they impinge on a building wall or ground, on which a phase matching method is used to find the reflected Gaussian beams. We will also concisely introduce a new method to consider 3D GB diffraction when incident on a wedge. Overall coverage map shows the dominant effect of shadowing in the millimeter wave band. Received mean signal power in a line of sight route is produced to be compared with results from an exhaustive ray tracing method done by other authors.