In the Bullington model, computed free space field strength is adjusted for obstruction attenuation for knife-edge diffraction based on the method described in “Radio Propagation for Vehicular Communications” by Kenneth Bullington (IEEE Transactions on Vehicular Technology, November 1977). Facility and path parameters (transmitter power, directional antenna, beam tilt, earth curvature correction, antenna heights, etc.) are all user-specified to provide maximum flexibility in system design. Bullington is widely used for link and land mobile coverage and is the best model for air to ground prediction and also in rugged terrain. It computes field intensity values at specified radial, tile or individual locations, based on terrain data for a site and path, transmitter power, directional antenna, etc., using free space field and the Bullington obstruction loss method.
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