On Tue, 1 Sep 2015 11:59:45 -0400, Tom Gardner wrote:

See ads for wallets that prevent skimming credit cards? Are those
considered Faraday cages? I was thinking I could laminate some AL foil
the size of credit cards and have one on top and bottom of the stack of
cards in my wallet to do the job. Sound feasible?

http://www.consumerreports.org/cro/m...ards/index.htm

Worth a try. A homemade duct tape and foil wallet worked better than
8 of 10 commercial products. By the way, RF jammers seem to be
illegal.

Pete Keillor