[TowerTalk]

[Rajiv Dewan, N2RD]

There is one other option to consider: two parallel dipoles, 
fed 180 degrees out of phase - the W8JK antenna.  The radiation 
from the two elements cancels straight up and the combination 
has a low angle of radiation and low radiation resistance.  
The radiation resistance rises as the antenna is raised above 
ground. Matching and efficiency is a big problem.  I built one
and used ladder line for 1/4 wave stub for matching.  
The SWR varied a lot with the weather.


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