Paladin wrote:
The elements are "linear-loaded". They are folded back on themselves.
The phsical length is 70ft.,But the electrical length is 210ft. long

Something like this? (fixed font)

35' 35'
-------------------------+ +-------------------------
| |
+------------------------+ +------------------------+
| |
+------------------------+ +------------------------+
| |
| |
| |
feedline

How far apart are the adjacent wires spaced?
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73, Cecil http://www.qsl.net/w5dxp