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The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.
Ladder line is an older, simpler form of parallel-wire line, often called open wire line. The configuration looks like a rope ladder , hence the name. It can either be purchased already made by a cable company, or home-made ; the construction is easy, though tedious, and originally all radio amateurs made their own open wire line.
Cattle grid on country road. Cattle grids are usually installed on roads where they cross a fenceline, often at a boundary between public and private lands. [5] They are an alternative to the erection of gates that would need to be opened and closed when a vehicle passes, and are common where roads cross open moorland, rangeland or common land maintained by grazing, but where segregation of ...
Simple split-rail fence Log fence with double posts (photo taken in 1938). A split-rail fence, log fence, or buck-and-rail fence (also historically known as a Virginia, zigzag, worm, snake or snake-rail fence due to its meandering layout) is a type of fence constructed in the United States and Canada, and is made out of timber logs, usually split lengthwise into rails and typically used for ...
Slip gates are a form of gate which permits people and vehicles through an entrance but which blocks the passage of animals. Branches or worked wood crossbars or stangs were used, one field slip gate pier with L-shaped grooves and the opposing stile gatepost with square or circular concavities to receive the three or four horizontal crossbars.
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Typical agricultural barbed wire fencing Sioux Mems Pro2 Split-rail fencing common in timber-rich areas A chain-link wire fence surrounding a field Portable metal fences around a construction site A snow-covered vaccary fence near Ramsbottom in Greater Manchester, UK Between fence and hedge: Acanthocereus tetragonus, laid out as a "living fence", rural area, Cuba
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