Not trying to nitpick, trying to spread knowledge... Anti-static bags are in fact Faraday cages, just really bad ones. Being a Faraday cage is in fact what protects from a static discharge. But they only protect from electromagnetic discharge well because they allow surface charges to skim across the surface. Protecting from a spark or current which is an actual stream of electrons moving though a physical conductive material is very different from protecting from an electromagnetic field/wave that is propagating through empty space. In order for a Faraday cage to protect from a signal rather than a spark there are several more factors that matter. Primarily the grid size if it is a mesh cage and whether the cage has either passive grounding or active voltage potential. Grounding the cage or holding it at a steady charge is what blocks waves... The cage maintains a constant change potential... the wave has it own charge potential... If the wave has enough power it will overcome the charge potential of the cage and penetrate.