[img]http://www.hdtvprimer.com/ANTENNAS/Yagi9.gif[/img]
Shown above is the 3-dimensional radiation diagram for a 9-element Yagi antenna that the author uses to receive channel 12. To interpret this diagram, imagine that the antenna is at the origin. The length of a line from the origin to any point on the surface is proportional to the gain in that direction.
2-dimensional pattern diagrams are more common. The following two diagrams describe a Channel Master 4228.
[img]http://www.hdtvprimer.com/ANTENNAS/cm4228az.gif[/img]
[img]http://www.hdtvprimer.com/ANTENNAS/cm4228el.gif[/img]
Radiation pattern
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