/members-area/personalblogs/b/nexgen-flight-simuator/posts/flight-simulator-101-or-back-to-college---part-15-radio-propagation-and-slant-range-math-part-2Ok, this is how I'm going to solve this mess. first, we know two things : We know where the aircraft is in three dimensions: Lat, Lon, and Alt (above sea level) We know where the Station is in three dimensions: Lat, Lon, and Antenna (above sea levelen-USTelligent Community 12