In message , Rob
writes
Szczepan Bialek wrote:

napisa³ w wiadomo¶ci
...
Szczepan Bialek wrote:

"Ian Jackson" napisal w
wiadomosci
...

In the past, many amateurs did connect coax directly to a dipole.

And what they do if they have the monopole?

Connect it with coaxial transmission line, idiot.

If the monopole has only one radial it is exactly as the your dipole.
Right?

No. A monopole needs many radials, not one. if it has only one radial
the voltage at the end of the radial is the same as on the monopole,
and the whole thing becomes a dipole.

I think we need to avoid Szczepan's black and white (and usually
completely wrong) way of thinking about things. We need to consider
"When does a monopole become a dipole" (or vice versa).

With no actually ground connection, you could have a nominal monopole
with (say) only one radial (eg an extremely badly radiating quarterwave
radial running horizontally at ground level, and a quarterwave radiating
element going vertically (or semi-vertically) upwards. If you then raise
the radial so that it starts to radiate better - or if you raise the
whole antenna system away from the ground - it will then increasingly
become a dipole.

Of course, while a monopole with a single ground-level radial (and no
ground connection) would work quite well, it would not be as good as if
you added more (preferably spread out) radials. And the more radials you
add - especially if any overall radiation from the radials is negligible
- makes the antenna system more definitely a monopole than a dipole.
--
Ian