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LF
It now takes hundreds of watts to be observed or heard
around EU on 137 Khz whereas some years back less than 200 watts achieved a
good result like a QSO on CW. The 130 watt Ropex used by many resulted in many
CW QSO'S,
In those days most Amateurs were using normal antennas
like loaded inv L systems or some sort of vertical for both RX es
TX.
At present the trend seems to be probe or small loop
antennas and these do not seem to produce enough signal capture to the
RX.
The DX that I have worked in the past all had large
antenna systems.
These are my observations, maybe others have another
theory.
de mal/g3kev
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