Roy says,
People who blindly assume the marks on their S-meters are 6 dB
apart
should take a good look at your calibration results.

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The calibration of S-meters, 3dB or 6dB per S-point, has nothing to do
with which antenna produces the stronger received signal. It is purely
a comparison. Just use the same meter throughout the tests.

Roy, you must be still be using that ancient receiver. No doubt it is
working fine. But you still refer, quite arbitraliry, to your personal
S-meter as the North American Calibration Standard. Must everybody
else fall into line? Not me!
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Reg.