Collinear arrays of dipoles are high gain omnidirectional antennas.
2.
Portable radios usually use collinear arrays of vertical dipoles.
3.
Television and FM broadcasting stations use collinear arrays of specialized dipole antennas such as batwing antennas.
4.
Collinear arrays are used in the VHF and UHF frequency bands at which the size of the dipoles are small enough so several can be stacked on a mast.
5.
Both radiating sections have insufficient separation to realize the maximum benefits of collinear arrays resulting in slightly less than the optimal 3 dB over a traditional J-pole or halfwave antenna.
6.
For directional antennas, the collinear arrays of dipoles can be used to make high gain omnidirectional antennas, in which more of the antenna's power is radiated in horizontal directions.
7.
To reduce power radiated in the unwanted axial directions, in broadcast applications multiple bays fed in phase are stacked vertically with a spacing of approximately one wavelength, to create a collinear array.
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