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Recent years have seen the emergence of Unmanned Aerial Systems performing roles that use various Radio Frequency (RF) systems. Thus, there is a need to use accurate and broadly capable signal propagation models to capture multi-path effects as well as atmospheric effects in system requirements analysis. One such model, the Variable Terrain Electromagnetic Parabolic Equation (VTRPE) model, enables the required analysis for a wide range of applications. The work presented in this paper uses VTRPE to analyze signal propagation in multi-path environments and places the results in a system design context drawing conclusions to aid in airborne RF systems design.