At ~30 yards from even very high-voltage lines, magnetic fields are typically a few µT (tens of mG) or less, and electric fields are well under a few kV/m, both far below widely used public exposure reference levels. The “kV” number doesn’t translate to big fields where you’re standing, what matters is current. AC is the one that does the inducting; DC much less so.
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Ignored corona effects → at very high voltage, air itself starts to conduct slightly, which changes the field. They didn’t model that. Used just one phase angle → in real life the field changes over the 60 Hz cycle. They might have missed the true peak.