"Jeff" napisal w wiadomosci
...

They are not wrong a such; your quote is about "AM broadcasters", which
is
normally (and incorrectly) meant to mean 'long& medium Wave'
broadcasters. Because for the long wavelengths involved many such
broadcasters choose to use vertical monopoles for antennas, and for
those
monopoles to work efficiently they do indeed require a good ground
system.
(These were the systems that Marconi was referring to).

If there is sufficient space a dipole could be used which would *NOT*
require the ground system.

That in Warsaw required the ground system:
""Large constructed half-wavelength dipole towers include the Warsaw
radio
mast - the only half-wave dipole for longwave ever built."

S*


As I said in one of my other posts: That does not describe a 'normal'
balanced dipole, which is fed at the centre. It is the description of a
very special case where a 1/2 wave length radiator is 'end-fed'. It is not
what people normally mean when the refer to a dipole, although it is a 1/2
wavelength radiator fed against ground

"Physic Principle An End Fed Half Wave Length Antenna is a variation of the
much more common half wave length dipole antenna. When an antenna that is
one half wave length long has RF energy applied to it at its resonant
frequency a standing wave develops on it."

The earth is connected at the node. "A node is a point along a standing wave
where the wave has minimal amplitude."

Does ""Large constructed half-wavelength dipole towers include the Warsaw
radio mast - the only half-wave dipole for longwave ever built." needs the
ground?
S*