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Should I use a 1/4 wave or 1/2 wave antenna?

What is the difference between a ½-wave and a ¼-wave antenna?

Antenna Type ½-wave ¼-wave
Alternate name Dipole Monopole
# of elements 2 1
Requires ground plane? No Yes
Gain (dBi) 2.1 1.9

¼ wavelength
Frequency Inches Centimeters
915 MHz 3.1 8
2.4 GHz 1.17 3

In practice a ¼-wave antenna will exhibit similar performance to a ½-wave antenna though the radation pattern will not be as uniform.

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