Computer software for electromagnetic simulation analysis for antenna design, improvement and propagation; computer software for simulation and analysis of electromagnetic radiation patterns and coupling prediction; computer software for airborne antenna pattern and coupling prediction; computer software for analysis and prediction of radiation patterns and coupling of antennas on electrically large and electrically complex aircraft and vehicle platforms; computer software comprising and implementing a computational tool for antenna radiation pattern and coupling analysis and prediction which utilizes the uniform geometrical theory of diffraction (UTD) to provide a physical picture of antenna radiation mechanisms and their interactions with the platforms on which they are deployed; computer software comprising and implementing a computational tool for antenna radiation and pattern analysis and prediction which is applicable to arbitrarily shaped faceted geometries with or without multilayer coatings