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W8JK wire antenna

By Owen Quarles <>

For optimum performance, the antenna should be erected horizontally a minimum of 1/2 wavelength above ground.
When fed in the center, the antenna produces a bi-directional pattern. The antenna may be made directional by attaching the feed to one of the dipoles.The pattern will be directed towards the 'other' dipole.
Connecting a string the length of 'B' between the ends of the dipoles will help keep the spacing of the wires uniform.

Here is a rough diagram and the calculated measurements I used:

A | | A
| |
| | <--450 ohm
| | ladder line
| | length 'B'
| |
\ /
/ \ (180 DEG)
| |
| |
| |
| |
| |
________________| |________________
20m A = 29.4ft B = 8.46ft
40m A = 58.7ft B = 16.9ft
80m A = 134.9ft B = 38.9ft
'B' is an electrical 1/8 wavelength with a 1/2 twist between dipoles.
Feed is connected halfway between dipoles with twinlead or balun and coax.
I used random lengths of 450 ohm line to feed these antennas and had very good results with them.

(Editorial note: While the given values are for the Ham bands, this antenna works great as a receiving antenna on other bands as well, after dimensions have been adjusted)

Originally posted on the Low Power Amateur Radio Discussion mailing list, March 2, 1997.
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