The outer protection range formed by three high lightning rods is determined by the calculation method of two equal high lightning rods. If the minimum width of bx s0 on one side of the protection range between the adjacent lightning rods on the inside of the three pins is protected, the full area is protected. A quad or polygon consisting of four or more lightning rods of the same height can be divided into two or more triangles, and then calculated to determine the protection range by means of three lightning rods of the same height.