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Such antennas can be built with little wind load and minimal weight. For VHF and UHF Moxon antennas are small enough that they are more often made from around 3 / 8 ~ 3 / 4 inch diameter aluminum tubing, to take advantage of the broader resonant bandwidth, without suffering from excessive wind load.
'BT' – to mark it as a British Telecom UK Pole (This can also be PO (Post Office) or GPO (General Post Office) depending on the age of the pole) a horizontal line marking 3 metres from the bottom of the pole; the pole length, typically 8 to 10 metres, [22] and size. 9L is a 9 metres long, light pole, other letters used are 'M' (Medium) and 'S ...
Undercut studs have a shank equal to the pitch diameter of the screw thread. Undercut studs are designed to better distribute axial stresses. In a full-bodied stud the stresses are greater in the threads than in the shank. [5] Undercut studs (rolled thread) are also stronger because the metal is "rolled" up to the major diameter, not removed.
Tubular steel poles are typically used in urban areas. High-voltage lines are often carried on lattice-type steel towers or pylons. For remote areas, aluminum towers may be placed by helicopters. [5] [6] Concrete poles have also been used. [2] Poles made of reinforced plastics are also available, but their high cost restricts application.
The head of a pike pole with various implements for pulling items The head of a short firefighter's pike pole. A pike pole is a long metal-topped wooden, aluminium or fiberglass pole used for reaching, hooking and/or pulling on another object. They are variously used in boating, construction, logging, rescue and recovery, power line maintenance ...
The conduit may be coated to prevent corrosion by incidental contact with concrete. Aluminum conduit is generally lower cost than steel in addition to having a lower labor cost to install, since a length of aluminum conduit will have about one-third the weight of an equally-sized rigid steel conduit. [2]
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