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Section 5 Antennas and Transmission Line u Antennas such as Yagi’s have gain, and are unidirectional. This means the electromagnetic wave is concentrated into one direction u Gain of antennas is measured in decibels u The directivity of antennas has a similar effect as using a higher powered transmitter u The effective radiated power (ERP) of the transmitting system is increased 24 November 2009 TrainSafe Australia 95
