Gain for an antenna is expressed in decibels relative to an isotropic radiator (point source
that radiates equally in every direction). Physical attributes of an antenna, in conjunction with the operating
frequency, results in constructive and destructive interference patterns being set up a points distant from the
antenna. Where the fields add constructively a positive gain is experienced, and where fields add destructively
a negative gain is experienced (relative to isotropic). These drawings and parameters
were derived from the EW and Radar Systems
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