[Towertalk] OCF Longwire with moveable feed point

[Terry O'Neill]

The athuor of the 1969 article (John Schultz, W2EEY) plots horizontal radiation patterns for a 3.5 wl version @ 9 diffrent feedpoints along the length of the wire.

The  patterns are very interesting.

For example, if the wire is fed 3/8 of a wl from one end, the pattern has major lobes nearly broadside (90 degrees) to the wire. Moving the feedpoint to 1.5 wl from one end results in major lobes at about 45 degrees, .5 wl results in major lobes @ about 10-15 degrees from horizontal.

All 9 patterns show deep nulls off the end of the wire so you'd have to orient the wire with the ends in the least favored direction.

The Antenna Book (17th edition) suggests a 3.5 wl single wire antenna has a take off angle of about 28 degrees. It does not indicate that the TO angle is dependent on the height of the wire, but I would guess it has to be at least 1/2 wl high to achieve the indicated TO angle.

 



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