As a supplement to Joel McNamara's exemplary new TEMPEST page, and thanks to Steve Schear, we've put Van Eck's 1985 paper on TEMPEST at: http://jya.com/emr.pdf (702 kb) It's a finely detailed paper on EMR snooping with copious graphics. As Joel and Seline note, it may be purposely misleading on TEMPEST, (as appropriate to TEMPEST legends; Seline's may be bent as well, but who knows what the disinfoes know). Read Joel's page for the bright light facts.