The SHADO Program is an antenna coverage model. It will generate a plot of a specified area and will shade the areas that are within the radio line-of-sight of either antenna or both antennas. SHADO uses the terrain/topographic database. Data elements are spaced every 30 seconds. This is equivalent to approximately 1 point every 0.8 kilometer in both latitude and longitude. The data point density is sufficient to perform an accurate analysis of propagation loss. This program can plot a previously saved file or create a new file to plot. A plot device must be chosen if a plot is wanted at this time.