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  2. United States National Radio Quiet Zone - Wikipedia

    en.wikipedia.org/wiki/United_States_National...

    The most severe restrictions to the general public are imposed within a 20-mile (32 km) radius of the Green Bank Observatory. [5] The Observatory polices the area actively for devices emitting excessive electromagnetic radiation such as microwave ovens, Wi-Fi access points, and faulty electrical equipment and asks people to stop using such ...

  3. Template:Earth radius/doc - Wikipedia

    en.wikipedia.org/wiki/Template:Earth_radius/doc

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate

  4. Mattoon, Illinois - Wikipedia

    en.wikipedia.org/wiki/Mattoon,_Illinois

    According to the 2021 census gazetteer files, Mattoon has a total area of 10.32 square miles (26.73 km 2), of which 10.31 square miles (26.70 km 2) (or 99.96%) is land and 0.00 square miles (0.00 km 2) (or 0.04%) is water. [14] Nearby rivers have been dammed to form Lake Paradise and Lake Mattoon south of the city.

  5. Angle gauge - Wikipedia

    en.wikipedia.org/wiki/Angle_gauge

    An angle gauge is a tool used by foresters to determine which trees to measure when using a variable radius plot design in forest inventory. Using this tool a forester can quickly measure the trees that are in or out of the plot. An angle gauge is similar to a wedge prism though it must be held a fixed distance from the eye to work properly ...

  6. Radial tree - Wikipedia

    en.wikipedia.org/wiki/Radial_tree

    A radial tree, or radial map, is a method of displaying a tree structure (e.g., a tree data structure) in a way that expands outwards, radially. It is one of many ways to visually display a tree, [ 2 ] [ 3 ] with examples dating back to the early 20th century. [ 4 ]

  7. Height above average terrain - Wikipedia

    en.wikipedia.org/wiki/Height_above_average_terrain

    The FCC procedure to calculate HAAT is: from the proposed or actual antenna site, either 12 or 16 radials were drawn, and points at 2, 4, 6, 8, and 10 miles (16 km) radius along each radial were used. The entire radial graph could be rotated to achieve the best effect for the station.

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