Power line interference in the form of hum and buzz is very disruptive of Natural Radio listening. Your best listening will be when you are as far away from power lines as possible. You should be at least a couple of miles from transmission lines (The lines with big insulators, usually on metal towers) and a half mile or more from distribution lines (the lines that bring power to homes and businesses.) This isn't difficult in a rural area, but is tough for the city or suburban dweller. Look for parks and other open spaces, or even neighborhoods with underground power lines. Finding a quiet listening area that is accesible during the pre-dawn hours is often the biggest challenge for the natural Radio Listener.