1. A computer-based machine for determining wireless communications transfer characteristics between a transmitter location and a receiver location within and around an architectural structure based upon a floor plan of said architectural structure, material parameter and said transmitter and receiver locations, comprising: means for receiving inputs; means for determining from said inputs said floor plan of said architectural structure, said transmitter location and said receiver location within said floor plan, and respective relative permittivity and conductivity values of walls within said floor plan; means for determining said transfer characteristics for a communications channel between said transmitter and receiver locations by mathematically combining said transmitter location, said receiver location, said relative permittivity values, and said conductivity values; and means for displaying said transfer function.