A guy-wire or guy-rope is a tensioned cable designed to add stability to structures. One end of the cable is attached to the structure, and the other is anchored to the ground at a distance from the structure's base. They are often configured radially (equally spaced about the structure) in trios, quads (pairs of pairs) or other sets. This allows the tension of each guy-wire to offset the others. For example, roof antennas are sometimes held up by three guy-wires.
On some very high structures flight safety markers on the guys themselves are necessary. Shorter, sturdier structures, such as electrical utility poles, may require only a single guy-wire to offset the pull of the electrical wires.
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