Diff: CollinearAntenna

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 {http://www.guerrilla.net/reference/antennas/2ghz_collinear_omni/last_element_top_of_array.jpg  Partial assembly drawing} 

 A Coaxial Collinear is a common omnidirectional antenna made up of 1/2 wave sections of coaxial cable connected in series, but out of phase with each other.  Here's a couple of references for building that high gain omnidirectional antenna. 

 

+!! These three links appear down at the moment. (18/6/06) 

+ 

 (http://www.guerrilla.net/reference/antennas/2ghz_collinear_omni/  A 2.4Ghz Vertical Collinear Antenna for 802.11 Applications) -- 2.4Ghz specific. 

 

 (http://www.repeater-builder.com/rbtip/wa6svt.html  Omni-Gain Vertical Collinear for VHF and UHF) -- More info, though aimed at lower frequencies