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Topband: Linear Loading & 160-Meters

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Subject: Topband: Linear Loading & 160-Meters
From: "dick-bingham" <>
Date: Wed, 24 Feb 2010 08:27:07 -0800
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Good morning everyone!

Regarding the comments on "Subject: Re: Topband: "Linear Loading" & 
I did not see any comments about the use of 'full-size' elements for the 
'Bob-Tail' and
'Half-Square' antennas where the horizontal 'top' phasing wire is at, say, 
80/90 feet.

I have been using sloping end-wires in my version of a "Half-Square" (horiz 
top wire ~80ft)
and it has been my best-ever 160-Meter antenna. A simple 'no-brainer' but 
highly effective
antenna! No multi-wire radial ground system required unless you think a 
single ground-rod
hammered into rocky/sandy soil at the antenna feed-point is 'extensive' !!

Yes, the sloping H-S does favor the direction towards the 'sloped-end' 
(modeling indicates
about 3dBi forward and 1dBi reverse direction gain) but from here in 
WA-State I get great
coverage of the USA and have worked SM and have been heard in "G" and "DL" 
land using

As an aside, VK6VZ's two sloping isolated delta-loops (apexes slightly 
spaced but
supported from a central support @94ft and their outlines look like a 
skeleton 4-sided
pyramid) use linear-loading in each base-leg. This more complex but still 
'simple' antenna
models-out at about 1db less gain than the sloping H-S but has wider -3dB 
gain beamwidth.

If you have the 'room' to slope your wires but insufficient 'height', I 
would highly recommend
the 'Sloped' version over a so-called linear-loaded H-S or Bobtail array...

73 Dick/w7wkr CN98pi 

UR RST IS ... ... ..9 QSB QSB - hw? BK

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