A recent issue of Scientific American describes a new material fashioned from an amalgum of plastic and metal dust that shields effectively against medical x-rays and most radioactive isotopes. The metal content transmits heat, so full body suits made of this material can be worn continuously, even while exercising. A nice outer layer of mu-metal would shield effectively against radio frequencies and low frequency electromagnetic radiation.
The inventor says tents could be made of it also. I recommend this to the entire ID community. Perhaps one large tent would hold them all, if they are large tent conservatives.