[TowerTalk] COUNTERPOISE for Dipoles

[Gary McDuffie, Sr.]

On Fri, 11 Aug 2000 15:46:11 +0000, Bruce wrote:

> The main objective when using the NVIS concept is the take off angle, not gain.

This is common practice in this part of the country.  Lots of people in
the rural areas put a reflector under their 75 and/or 160m dipoles.  As
Tom says, the point is to make the signal go straight up, not out, so as
to have a good signal on the local nets.  It will decrease long haul
signals and DX.  This is also why a full wave loop works so well on
lower bands.  It radiates straight up at the resonant frequency.  A
simple, reflector length single wire, a little less than a quarter wave
under the dipole does a great job, especially if you don't have a clue
where the earth's reflective level is.

Gary

ag0n at arrl dot net
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