Factors Involved in Gain Determination of A Tv Antenna

Gain is a vital characteristic of a broadcast TV antenna because of the direct relationship of antenna gain to the station's maximum effective radiated power, or ERP. This paper discusses the various parameters that may influence antenna gain, such as beam tilt, null fill and feed system efficiency. These and certain other factors must be taken into consideration in predicting the gain of a proposed antenna, whether it be horizontally or circularly polarized. Although a conservative value of the gain is estimated, the procedure will assure that the specified gain is achieved.