You're going to have far more "exposure" to EM radiation from the wiring and appliances
inside your home than you could conceivably get from a powerline 1/4 mile away. I have yet to see a single "study" of cancer clusters "associated" with powerlines that rose to the level of statistical significance. The people panicking (and seeking to panic others) on this subject (and many others) don't understand statistics, and don't realize that things like cancer
will not be spread "evenly" across populations, or geographic areas or any other arbitrary category and that there will always be apparent "clusters" as a result. This is a classic case of assuming causation when two things happen to be seen together.
On my last job I had to get up when it was still dark outside, and I did the same on weekends to keep my body clock on schedule. So I'd get into the shower every morning when it was dark, and by the time I emerged showered and shaved from the bathroom, the sun would be coming up. Did my shower cause the sun to rise?
Personally, I don't think so. Your mileage may vary.
Regards,
Joe