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Spacing of the fences needs to be small in comparison to a wavelength (λ) in the substrate dielectric so as to make the fence appear solid to impinging waves. If too large, waves will be able to pass through the gaps. A common rule of thumb is to make the spacing less than λ/20 at the maximum operating frequency. [6]
Picket fences are a type of fence often used decoratively for domestic boundaries, distinguished by their evenly spaced vertical boards, the pickets, attached to horizontal rails. Picket fences are particularly popular in the United States, with the white picket fence coming to symbolize the ideal middle-class suburban life.
Silt fence installed up-slope of a vegetated stream buffer. A silt fence, sometimes (misleadingly) called a "filter fence," [1] is a temporary sediment control device used on construction sites to protect water quality in nearby streams, rivers, lakes and seas from sediment (loose soil) in stormwater runoff.
A steel fence post, also called (depending on design or country) a T-post, a Y-post, or variants on star post, is a type of fence post or picket. They are made of steel and are sometimes manufactured using durable rail steel. They can be used to support various types of wire or wire mesh.
Picket fences, generally a waist-high, painted, partially decorative fence; Roundpole fences, similar to post-and-rail fencing but more closely spaced rails, typical of Scandinavia and other areas rich in raw timber. Slate fencing in Mid-Wales; Slate fence, a type of palisade made of vertical slabs of slate
The spacing between pickets must be less than 4". If space between pickets is less than 1 3/4'', rule #2 does not apply and fence does not have to be taller than 48'' (because the tighter picket spacing has made climbing much more difficult). The space between the bottom horizontal rail and the ground must be less than 2".
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