Image: Collinear folded dipole antenna array
Description: A collinear folded dipole antenna on a communication tower on Lake Mountain, Utah, USA. It consists of 4 vertical folded dipole antennas in a line, fed in phase. It is an omnidirectional antenna, radiating equal power in all horizontal directions. The advantage of using 4 antennas is that the horizontal gain is increased; more of the radio power is radiated in horizontal directions and less up into the sky and down toward the earth where it is wasted. Four collinear half wave dipoles have a gain of 6 dB over a single dipole's gain of 2.15 dBi or a total of 8.15 dBi. Collinear dipole arrays like this are often used as the base station antennas for dispatchers for radio-equipped mobile services such as police, fire, ambulance, taxi, and delivery services.
Title: Collinear folded dipole antenna array
Credit: Derived from LocalservicesLakeMountain.jpg. Cropped out unrelated areas of image.
Author: Original image: Milonica Derived image: Chetvorno
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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