Including tower is generally referred to as the steel tower and single tube, four pipe, Angle steel tower, etc.

One explanation for the derrick is a kind of lifting using large columns, and hoist, pulley block and wire rope work together, can be in situ hundreds of tons of weight lifting.

Communications industry in the derrick is part of the communication tower, similar to the lightning rod, bar, gym, platforms and other such parts, mainly in communications tower above fixed the antenna to use.

How the top of the derrick is used in floor, ∅ 76 commonly used material, height of 3 to 6 meters, the fixed antenna is placed on the daughter on the wall or floor.