"Rob" napisal w wiadomosci
...
Szczepan Bialek wrote:
"One side of the antenna feedline is attached to the lower end of the
monopole, and the other side is attached to the ground plane, which is
often
the Earth.

This contrasts with a dipole antennawhich consists of two identical rod
conductors, with the signal from the transmitter applied between the two
halves of the antenna.

Any comments?
Best Regards,
S*

Now you have written it yourself! With a dipole antenna you do not
need an earth connection because the signal is applied between the
two halves of the antenna, not between earth and the antenna.

Real dipole needs:
"In the lower half of the mast, there was a vertical steel tube, attached to
the mast's outer structure with large insulators. This tube was grounded at
the bottom, and connected electrically to the mast structure by an
adjustable metal bar at 328 metres.[2] This technique allowed adjusting the
impedance of the mast for the transmitter and worked by applying a DC ground
at a point of low radiofrequency voltage, to conduct static charge to ground
without diminishing the radio energy. Static electrical charge can build up
to high values, even at times of no thunderstorm activity, when such tall
structures are insulated from ground. Use of this technique provides better
lightning protection than using just a spark gap at the mast feed, as is
standard at most mast radiators insulated against ground."
From: http://en.wikipedia.org/wiki/Warsaw_radio_tower

End of discussion.
S*