SPLAT! is an RF Signal Propagation, Loss, And Terrain analysis tool for the spectrum between 20 MHz and 20 GHz. It provides site engineering data such as the great circle distances and bearings between sites, antenna elevation angles (uptilt), depression angles (downtilt), antenna height above mean sea level, antenna height above average terrain, bearings and distances to known obstructions, path loss based on the Longley-Rice Irregular Terrain Model, and minimum antenna height requirements needed to establish line-of-sight communication paths absent of obstructions due to terrain.
Below is the predicted LOS for OHalloran Hill, it assumes both up and down tilt and no signal path loss, only path obstruction.
Below is the predicted signal path losses between OHalloran Hill and Highgate Park (Julia Farr)
chart values
What does blue and green represent ?
Legend
Look at the legend in the image.