A tin box with a lid will act to shield the signal contrary to HJ's opinion. The reference to a lead lining is also misleading. Lead is used to provide shielding from nuclear radiation and is not necessary here.

You are right, pretty much. I have tested this on my cars. With the key in a tin box with a tight lid, the car can't be opened until I bring the box within inches of a certain part of the car. It works even better when I line the box with aluminium foil. Then I can't open the car whatever I do.

There is nothing special about a 'Faraday bag' apart from its inflated price, nor about a 'Faraday cage'. A metal building is a good Faraday cage, which is why phones and GPS receivers work badly when inside them. The definition of a Faraday cage is anything with a continuous covering, or a mesh, of conductive material - that's all there is to it. A continuous covering works better than a mesh. However, none of these devices can block all signals under all circumstances, only attenuate them greatly, which is why it's important to test in your own situation.

Edited by anogginthenog on 02/02/2018 at 21:33

Given the poisonous nature of lead, I would suggest finding a lead lined boxed is neither easy nor cheap too.

Edited by jchinuk on 04/02/2018 at 17:25

A tin box with a lid will act to shield the signal contrary to HJ's opinion. The reference to a lead lining is also misleading. Lead is used to provide shielding from nuclear radiation and is not necessary here.

As a trained ohysicist , I agree. See the Top Gear experiment where they blasted a Golf with High Voltage lightning. www.topgear.com/videos/top-gear-tv/richard-hammond...5