4RF Aprisa XE User Manual - page 26
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Aprisa XE User Manual
Yagi Antennas
Factor
Explanation
Frequency
Often used in 330-960 MHz bands
Gain
Varies with size (typically 11 dBi to 16
dBi)
Stackable gain increase
2 Yagi antennas (+ 2.8 dB)
4 Yagi antennas (+ 5.6 dB)
Wind loading
Less than a parabolic grid antenna
Tower aperture required
Unstacked: Less than a parabolic grid
antenna
Stacked: about the same as a
parabolic grid antenna
Size
Range from 0.6 m to 3 m in length
Front to back ratio
Low
Cost
Low
It is possible to increase the gain of a Yagi antenna installation by placing two or more of them in a stack.
The relative position of the antennas is critical.
Example of stacked antennas