seems like tinfoil underwear should provide more bang for the buck, what with everyone carrying around cell-phones these days.

Of course none of these would be effective against longitudinal (tesla) waves that can penetrate a faraday cage, but that doesn't matter since the bulk of the scientific community has been ignoring them for the past 100 years anyway, so there are few local sources.  Nor are they known to be harmful to one's nuts or brain.