Conductive Fabric, RFIDWIFI Blocking Nickel/ Copper Fabric. 43x1' (1 foot)

They set up a "safe room" then use two conductive layers separated by an insulator, THEN hold the fabric on the wall by using a thumb tack or nail. BAD IDEA because the tack/nail bridges the two conductive layers together.
They set up a safe room then use two conductive layers separated by an insulator, THEN hold the fabric on the wall by using a thumb tack or nail. BAD IDEA because the tack/nail bridges the two conductive layers together.

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Faraday Fabric 43.3in * 118in, Conductive Fabric Made from Copper and Nickle Faraday Fabric, Military Grade Material DIY for Protection from Bad

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Faraday Fabric 43.3in * 118in, Conductive Fabric Made