Szczepan Bialek wrote:

So the earth is necessary in your radio for the static reasons.

You have no clue what he is talking about.

In my also:
"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

It seems to me that the same reasons were in Marconi times.

So I repeat my question:

""The necessity or utility of the earth connection has been sometimes
questioned, but in my opinion no practical system of wireless telegraphy
exists
where the instruments are not connected to earth."(Marconi in 1909).

It is still true?
S*

It never was generally true.

You have been told this many times now.