The Antenna Line of Sight Range calculator estimates the range (drange) for effective line of sight of an antenna based on the height (h).
INSTRUCTIONS: Choose units and enter the following:
Line of Sight Range: The calculator returns the range in miles. However, this can be automatically converted to other distance units via the pull-down menu.
The line of sight is only effective assuming there are no obstructions (e.g. mountains, buildings) or heavy atmospheric interference by heavy rain or fog. Also, it includes accounts for no propagation margin.
Special thanks to James Redding for his Quora answer that was the basis of this calculator.