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## Re: [TowerTalk] Radial length

 To: Jim Brown Re: [TowerTalk] Radial length Larry DiGioia N8KU Mon, 17 Mar 2008 07:11:56 -0400 mailto:towertalk@contesting.com>
 ```Here is the short version: 1.) radials are the "other half" of your ground-mounted vertical antenna 2.) dirt doesn't make a very good antenna construction material Jim Brown wrote: > Certainly a circularly symmetrical radial system is best, but few of us are > able to realize it. Mine deviates significantly from that ideal, but the > antenna works well. The best and most readable description I've seen for the > function of a radial system is by W2DU, as a chapter of his book > "Reflections." It's on his website. Google on w2du to find it. N6LF has > written a rather detailed version that's in the Antenna Book, but there are > typos in the associated graphics that make it difficult to follow. > > The short answer is that the radial system functions as a return for the > currents and the fields associated with the antenna. The lower the resistance > of whatever conductors serve this function (including the earth), the closer > the antenna comes to full theoretical efficiency. The radial system does NOT > function as a reflector for the signal. The earth at significantly greater > distance from the antenna serves that function. > > I have seen many references in the literature to the effect that NEC is not > very good at modeling ground losses and the effect of radial systems. Count > me among those who 1) consider real measurement of one radial system compared > to a reference antenna as the only meaningful predictor; 2) consider soil > conditions at any given location to be an influence on how many radials it > takes to get there; and 3) consider Tom's advice, and the advice in the > Antenna Book to be solid as a rock. > > 73, > > Jim Brown K9YC > > On Sat, 15 Mar 2008 14:23:26 -0400, Robert Carroll wrote: > > >> On the other hand if I were >> only trying to provide a low loss ground return, I might route the radials >> for convenience in avoid things like a garden, a pool, or some other object. >> Which view is the correct one? >> > > > > _______________________________________________ > > > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk > > -- Larry N8KU l o n g w i r e . c o m HF - DX - CW - Digital _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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