Lots of the
all description of the Broom Antenna pointed that the efficiency
of the antenna depends from the factors, factors that increase
the atmospheric current in the antenna. But how increasing of
the current can influence to the reception?
I may suggest
the follow hypothesis. Ion current flowing from the broom wires
looks like short conductive path. Incoming radio signal may
modulate the conductive path. So, atmospheric current going
into antenna wire may be modulated by nearby radio signals.
Antenna circuit is tuned to desired incoming radio signals,
so only wanted radio signals would have maxima strength of the
Ion current flowing from the broom wires may create a column
of ions above the antenna. The column may work like an additional
antenna connected to the broom, so, it looks like our broom
antenna physically making longer by the column of ions.
I have read
in one old book interesting note. Reception of DX stations coming
better at winter windless evening when in the home began light
the oven. When I read it I though it is nonsense. How an oven
can improve radio reception? But for now I understood that it
is not nonsense. Smoke from a chimney goes straight in the sky
at windless weather. However the smoke column is a stream of
easy- ionized air, so, the column has a little conductivity.
Of course, such smoke antenna may improve performance of existing
antenna or by re- radiation or adding its height
to the existing antenna.
from I.G.: It is really that a Russian Oven may be treated (with
some limitations) like an ion generator…
by I.G.: At first it was strange to me. Why atmospheric current
that flows in the antenna wire can improve the antenna performance?
Another puzzle for me: in Russia Broom Antenna has another name
– low noise antenna. Lots Russian amateurs
handbooks described the antenna like low noise. For example,
 described the antenna like low noise antenna
for reception. I had used the antenna in 70s,
I could speak that is really low noise antenna that gave good
reception. However next chapters of the articles are cleared
for me the puzzle.
4. Parameters of Silent and Corona discharge
volt/ current parameters of the broom antenna, i.e. how depends
discharging current from potential between the air and antennas
ends. If we will increase potential between the air
and wires of the Broom Antenna the current that flow in the
antenna also will increase. It is so called Silent Discharge
that going because always there are some quantity
of “free” ions in the air. Figure 3 shows Antenna Current Vs
Potential between antenna wires and the air.