Two items ...
The now-QRT 20 kHz and the present 60 kHz transmitters
at WWVL / WWVB had / have such high antenna Q that a
close-overhead thunder storm cloud can detune the antennas
enough to cause a TX overload / shut-down.
I've read that VLF BC stations limit audio bandwidth to avoid
exceeding their antenna's bandwidth.
Ken Kopp - K0PP
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