I think about 26 ft. (3 sections with 4 ft. buried in concrete) is about all
that is recommended for a freestanding 25G tower, with negligible wind load
such as a small TV antenna. With even that they recommend at least a house
bracket. I wouldn't try to use an unguyed 25G at any length to hold up a
dipole without at least one guy attached to each tower to oppose the pull of
the dipole. An ice storm or heavy wind could cause the dipole to pull the
unguyed tower enough to bend it. Notice that the power and telephone co.
uses a guy wire on a wooden pole that carries nothing more than a telephone
drop cable across a narrow road.
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