On Sep 12, 3:53*am, Szczepan Bia³ek wrote:
S* wrote about ferrite loopstick antennas:
MW has about hundred meters. Is impossible to place normal dipole.
The helical wound antenna is used. The rules are the same like
for normal dipole.

Untrue. Please read the description linked below, which states that
these antennas respond to the magnetic field of an EM wave. Dipoles
respond to the electric field.

As the magnetic field of a vertically-polarised wave lies in the
horizontal plane, loopstick antennas in AM broadcast receivers are
positioned horizontally.

http://www.radio-electronics.com/inf...od_antenna.php

S* wrote about directional MW arrays...

The masts are 1/2 wave lenght apart.

Their spacing can vary depending on the directional pattern needed by
the station.

RF