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antenna gain
1. In technical terms, the gain is the ratio of the power required at the input of a loss-free reference antenna to the power supplied to the input of the given antenna to produce, in a given direction, the same field strength at the same distance.

Antenna gain is usually expressed in decibels and the higher the gain the more powerful the energy output. Antennas with higher gain will be able to read tags from farther away.

2. The conductive element that radiates or receives energy in the radio frequency spectrum to and from the tag.
This entry is located in the following unit: Radio Frequency Identification (RFID): Definitions (page 1)