I have been dealing with terrible noise on HF lately from 160m-20m. I searched for the source, and it is not close by. (I actually got my neighbors on either side to let me switch off their mains as well for a test last week.) I have just about given up finding it, and I am about to put up a noise antenna and do some phasing. A freak storm came through yesterday afternoon with wind gusts in excess of 100mph and took out power for about 40,000 residents of my city, me included. I connected my batteries--which I had already charged in preparation for field day--and jumped on the air. WOW! With the exception on the occasional lightning crash, 80m was pristine. What would have been noise and about 3 QSOs over 100kHz or so because a QSO about every four or five kHz. 40m was not as active, but just as beautiful. I am not going to move out to the country side. The rest of my life just works too well for it to be worth it for the sake of radio; but it is wonderful to occasionally enjoy its benefits.