Hi Simon,
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I wouldn't exactly call it a hill, but just a slight slope. Still, I did take care to keep the elevated radials level. One one side of the antenna the radials are about one foot above ground, and on the other side they are three and a half feet or so above the lawn.
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Each loop is 12 feet wide, as I used 2X 6-ft fiberglass supports on either side of the vertical mast. Untensioned width is about 12.1 feet, but when tensioned in use the final width of the lower horizontal portion of each loop is 12 feet.
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Each radial extends two feet further out, so the entire footprint of my antenna is 16 ft square.
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73,
Guy
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Guy Atkins