Szczepan Bialek wrote:

"W5DXP" napisal w wiadomosci
...
On Saturday, July 28, 2012 2:15:21 PM UTC-5, Szczepan Bialek wrote:
AC is in oscillating circuit (closed circuit). RF current is in an
antenna (open circuit).

RF *IS* AC.

Yes. But RF CURRENT is: " "Electric currents that oscillate at radio
frequencies have special
properties not shared by direct current or alternating current of lower
frequencies. The energy in an RF current can radiate off a conductor into
space as electromagnetic waves (radio waves); this is the basis of radio
technology."

Where ever you got this piece of trash quote, it is wrong just like all
your ancient quotes from over a hundred years ago.

AC of any frequency can radiate off a conductor into space as
electromagnetic waves.

Now are also ULF transmitters (30Hz). So the above is not precise.
What decide that "an RF current can radiate off a conductor into space"?

That the AC is applied to an appropriate antenna.

That is the purpose of an antenna, to convert AC into electromagnetic waves.

For the third time, AC of any frequency can radiate off a conductor into
space as electromagnetic waves.

There is no minimum frequency.