Scattering Characteristics of VHF Television Broadcasting Waves by Steel Towers of Overhead Power Transmission Lines

To determine the scattering characteristics of VHF television waves by steel towers for power lines, waves having a frequency 40 times that of television waves were radiated on a 1/40 scale model tower. The reflection characteristics were measured by rotating the model tower and changing the receiving point. A 50-cm by 50-cm metallic reflector was positioned at the model tower when measuring the reflection field and comparison was made of the receiving power from the model tower and that from the metallic reflector. The results showed that the maximum value of the reflection field attenuated in approximate proportion to the distance between the tower and the receiving point. This fact led to an experimental formula for determining the maximum value of the reflection field when the wave is incident upon the tower at a uniform strength in the vertical direction.