i have been living on this farm between 2 overland hv power lines for almost 8 years, and the sounds emanating from them vary from just electric field hum to outright arching sounds. i have walked below these monsters many many times during the day and during the night, sometimes wondering if the audible arching can be seen with long exposure photography. finally, tonight, when walking the dog it was visible even from 50 meters away. it sounded more rough than usual, and it is beautiful!