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Colinear antenna



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I had a teacher who used to say, it is not important to know information, just where it can be found.

I had the same wisdom from one of my teachers six decades ago. I took it to heart wholly and it has served me well, especially when I was a work-study in the university library during my graduate days... smile.png
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By stacking and properly phasing the antennas, you get higher horizontal gain and a narrower lobe in vertical gain (less multipath from ground reflection). Some collinear antennas like the one WRCD400 posted can have electrical downtilt, so just because it resembles a professionally built collinear does not mean it would be of utility for base station use (downtilt antennas cover limited areas close to a high-level site very well).

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