The electronics performs a two stage impedance transformation
between the E-field at the rod and the 75 ohm cable. A Ka value of
0.16 means that at all frequencies, the antenna is as efficient as
a full size dipole. The design of the complete antenna is made in
such a way, that for most of the listening time (day-night and
seasonal variations) the external, atmospheric noise, masks the
noise generated by the electronics. The design is fine tuned in
this respect and neither rod diameter nor rod length should be
altered.
Power is fed to the antenna via the coaxial cable, which floats
with respect to ground at the antenna end, except for a 3nF/3 kV
decoupling capacitor between the coax shield and body. The circuit
has adequate protection against lightning. There are no serviceable
parts inside