Yeah Roger, I used to live within 100 meters of three sets of 3 phase
high tension lines and they were VERY quiet. In 38 years of operation
from that location I can't recall more than a handful of noisy times,
generally during high humidity in July/August, when the insulators would
corona. These were generally cleaned up within a few days to a week.

DD, W1MCE

Roger Halstead wrote: