"Dave" wrote
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"Szczepan Bialek" wrote in message
...

"Dave Platt" wrote
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In article ,
Jeff Liebermann wrote:

I forgot to connect my comments to the original question. Sorry(tm).
You're correct. There's no way to get a good isotropic radiator
pattern with a simple vertical radiator. However, you can still get
fairly close if you make the antenna sufficiently small relative to
the operating wavelength. As the physical antenna size approaches a
point radiator, the pattern starts to look rather spherical.

The difference in pattern between a half-wavelength dipole,
and an infinitesimally-short dipole (i.e. one whose length
approaches a point source) is actually quite small.

A dipole is always the two monopoles and never a point source. Only
monopole is a point source.
S*

there is no such thing as a monopole antenna. unless you have discovered
the magnetic monopole somewhere?

Chris wrote: "Monopole antennas are developed from dipoles by substituting
one of the
elements, often using a 'reflection' of the remaining element in a ground
plane. Their characteristics are different from those of the parent dipole
because of this substitution but they still have the same kind of
axially-symmetric radiation pattern, with linear polarisation and no
radiation in the direction of the end of the monopole."

Is he right?
S*