Definition: | the ratio, usually expressed in decibels, in a radio link, of the radio-frequency power input to the terminals of the transmitting antenna, and the resultant radio-frequency signal power available at the terminals of the receiving antenna
NOTE 1 – The available power is the maximum real power which a source can deliver to a load, i.e. the power which would be transferred if the impedances were conjugately matched.
NOTE 2 – The system loss excludes losses in feeder lines but includes all losses in radio-frequency circuits which are integral parts of the antenna, such as losses in conducting, or dielectric radiating elements, antenna loading coil losses, terminating resistor losses, and ground losses in the vicinity of the antenna.
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