Szczepan Bialek wrote:

"Rob" napisa³ w wiadomo¶ci
...
Szczepan Bialek wrote:
The "ground plane antenna" is also the monopole:
"To function as a ground plane, the conducting surface must be at least a
quarter of the wavelength (?/4) of the radio waves in size. In lower
frequency antennas, such as the mast radiators used for broadcast
antennas,
the Earth itself (or a body of water such as a salt marsh or ocean) is
used
as a ground plane. For higher frequency antennas, in the VHF or UHF
range,
the ground plane can be smaller, and metal disks, screens or wires are
used
as ground planes".

Note that it does not say that it is sufficient to connect one side
of the antenna to the ground with a wire.

Note what Marconi did: "Marconi, who discovered if he attached one terminal
of his transmitter to a
wire suspended in the air and the other to the Earth, he could transmit for
longer distances."

Marconi was using low frequencies where the wavelength is so long that
his wires are comparatively short.

At frequencies where amateurs operate, the wavelength is comparable
to the length of the feedline and it no longer works like that.

A ground plane is something different than a wire to ground.

The nonactive leg of the popular "dipole" is connected with the braid of a
coax and the mass (chassis) of the transmitter.
The braid has many wires. Each of them is the radial.
S*

It does not work like that.
A quarter wave radial works because when one end is floating the other
end has a low impedance.