>"Do like the (LF/MF) broadcasters (or at least what they used to do)
>...measure field strength at several few points when the antenna/radial system
>is new, then measure at the same points every year or two."
The Potomac Instruments FIM-41 is capable of directly-read field strength
measurements and has a spec'd measurement range up to 5 MHz. Would like to
have one myself.
Measured field strength graphs typically show that beyond 60 radials (and
arguably 30 radials), performance decelerates to diminishing returns. The
benefit of the 120-radial broadcast standard is: (1) system stability,
especially when driving directional arrays and (2) mitigation of a slowly
decaying and eroding radial system over time.
Paul, W9AC
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