See Leeson's book PHYSICAL DESIGN OF YAGI ANTENNAS, Chapter 10, Section 10.13,
"Concrete Basics for Tower Installation". The last sentence reads, "Typically
the rebar must be covered by at least 2 in. of concrete to prevent exposure to
moisture, and spacing is as specified in the manufacturer's tower-base or guy-
anchor drawing."
73, Bert N4CW
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