The antenna is an "off-centre fed, capacity hatted, vertical
dipole"... Try saying that after fifteen pints..{:o)
John EI7BA
Jim Brown wrote:
> On Tue, 17 Nov 2009 23:29:19 -0500, Ian Hill - K8MM wrote:
>
>
>> Vertical dipoles are good low band antennas.
>>
>
> Hold on a minute -- I think we are talking about very different
> antennas. :) I have a top-loaded vertical (some would call it a
> monopole) for 160M that works a treat, but it is not a DIPOLE. It's
> an 86 ft vertical wire with a horizontal piece on top to bring it to
> resonance, and it works against radials (to carry the current and
> provide a path for the fields).
>
> A vertical half wave DIPOLE behaves VERY differently from a vertical
> monopole. The top half and bottom half of a vertical dipole both
> radiate, and together form a complete antenna. The vertical part of
> a monopole needs radials (or a counterpoise) to form a complete
> antenna, and to the extent that they are symmetrical, the radiation
> from the radials cancells in the far field.
>
> 73,
>
> Jim K9YC
>
>
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