Might be of interest to you GEsoftwhite100watts since I know you like radio stuff:
Last weekend I tried a scan through the AM band (with my (electronic-ballasted) lights ON), and got around a dozen stations, all had static and/or a continuous buzz noise in the background (varying amounts from 'just some', to 'a fair bit')
Tonight I did another scan through the AM band (with lights off), and got 15 stations, some came in pretty clear too, and one even perfectly - well enough that even the HD/Digital signal came in.
Even for it being just a talk station you could tell the increase in quality when the 'HD' kicked in.
This was all just using the little AM antenna that came with my tuner...makes me wonder, with a -good- antenna (ideally up in the attic), and did it late at night with everything (including computers) off, how much I'd get