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Old 21-Aug-2012, 12:54 AM   #4
GroundUrMast's Avatar
Join Date: Oct 2010
Location: Greater Seattle Area
Posts: 4,773
I would err on the side of caution, measure from the bottom most part of the upper antenna to the upper most part of the lower antenna.

The reflector and metallic structure of one antenna can have a detuning effect on not only the active element(s) but the tuned reflector and director elements of the neighboring antenna.
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