Experimental study of UHF mobile radio transmission using a directive antenna

Propagation experiments were run at 836 Mc between a fixed omnidirectional base station and a mobile station using a directional antenna. On typical residential streets it was found that the antenna orientation had only a small effect on the average signal level and that the fading rate was significantly reduced. It was also discovered that the fading rate expressed as a function of antenna direction has definite minima and maxima. These are related to two factors, the direction of motion of the vehicle and the direction from the vehicle to the base station. In general, minimum fading occurs along and at right angles to the direction of motion and in the direction of the base station.