For a new type of RF shielding consider "Flectron" a metallized fabric that allegedly shields up to 100db. Originally developed by Monsanto it has recently been bought by Advanced Performance Materials (which also makes a range of EMI-related products): http://www.apm-emi.com/ Another company, BEMA, Inc. offers portable enclosures made mostly of Flectron for TEMPEST protection, with RF-protected doors, vents, and electrical and cable connections. One is a walk-in, 6 x 6 x 7, weighs 125 lbs. and fits in two suitcases for transport. And there's a desktop version. These are reportedly in use by NSA, other TLAs, the military and corporations. There's a brief description at: http://www.martykaiser.com/bema1.htm The market in TEMPEST-related products is rapidly growing. Check AltaVista under that term or, say, NSA 65-6 and MIL-STD-285. There's more material appearing all the time as the word gets out on the need for RF-protection. We've heard from manufacturers that the demand for their shielding products is increasing for medical purposes -- some related to those dreaded signals being received by teeth and brain. Flectron clothing and bed shrouding are in the works. To be sure, Joel McNamara's TEMPEST Web site remains the best of all unclassified sources: http://www.eskimo.com/~joelm/tempest.html