I've recently tried the static bag using a samsung tablet - wifi and bluetooth both showed no attenuation with two different bags. A "farraday cloth" that was s

I've recently tried the static bag using a samsung tablet - wifi and bluetooth both showed no attenuation with two different bags. A "farraday cloth" that was suggested to me is priced at about $24 a linear foot (8'x1') so I wouldn't expect these cheaper solutions to be very effective. I would expect a microwave oven cavity to effectively reduce signals in 2.4ghz, though not signals in the lower gsm and related bands.