Propagation Analysis The Propagation Analysis module is a software plug-in that can be used to accurately model wide area spectrum monitoring capabilities at real-world locations. The Propagation Analysis module offers immensely powerful RF simulation, planning and analysis tools for both natural topographical and man-made structural features. The terrain data is first analysed for initial placement of receiver stations. This analysis allows the user to investigate the impingement on the first Fresnel zone between the receiver and potential target location. The analysis tools then use the in-built propagation models to investigate the receiver coverage and geolocation coverage. Most geolocation techniques require simultaneous data from one or more receivers and so a coverage analysis looks at how many receiver coverage areas can be seen at the same time. The receiver stations can then be best positioned to optimise the geolocation techniques being used. The propagation of RF signals can be modelled to varying degrees of complexity. In the most basic form, the Free Space model can be used which simply relies on the Friis Transmission Equation allowing simulation of the decrease in received power for increasing frequency and distance from the transmitter. Complexity and real-world correspondence is cumulatively built up with Earth Curvature, Line Of Sight and Fresnel models allowing the inclusion of horizon effects, obstacle shadowing, and obstacle diffraction and reflection effects respectively. This propagation modelling ensures the accuracy of geolocation and monitoring simulations as well as allowing propagation analysis coverage maps to be generated.