Line of Sight Calculator. This CalcTown line of sight calculator calculates how far the horizon is from an antenna placed at a particular height. The calculators also calculates the radio horizon. It assumes there is nothing between the radio signals and the antenna horizon. To get maximum line of distance you need to enter the height of the ... Your line of sight is the visible path of travel from your vehicle to the target area. This line can be blocked by a curve, the crest of a hill, a wooded If you cannot see around an obstruction, you must slow down and be ready to alter your position until you can reestablish a clear line of sight to your...Substitute the above given values of Station1 and Station2 in the formula, = √ (2*height) = √ (2*250) = 22 Miles . = √ (2*height) = √ (2*350) = 26 Miles . Line of Sight = 22 + 26 = 48 Miles. Related Calculator: Learn how to calculate the Line of Sight with this tutorial, given with the definition, formula and example. radar line-of-sight (LOS) equation: An equation that expresses the radar horizon range (RHR), given by where RHR s is the radar horizon range in statute miles, h is the antenna height in feet, and a is the object critical altitude, i.e., the target altitude in feet, below which the radar cannot illuminate the object.