High Tensile Fence
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Touted as the cheapest fence per foot because of the long distances between wooden posts. Essentially a high tensile fence is a heavy duty electric fence. Often they are spring loaded, preventing fallen trees from breaking the wire and allowing the fence to bounce back into place after the tree is cut away. High tensile fences are almost always electrified.
For a great basic guide, please follow the link and then open the first pdf link on the right side of the page: www.dareproducts.com/fence-designer/high-tensile/