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The Rock
reply to Blackbird

Re: Is "tin foil" now a banned phrase in this forum?

said by Blackbird:

said by StuartMW:

said by NetFixer:

...I wear my aluminum foil hat with pride...

Aluminum doesn't work that well

On the Effectiveness of Aluminium Foil Helmets

Go for copper/silver instead.


To be truly effective, a tinfoil hat must be made from a thin sheet of mu-metal, which is magnetically permeable as well as a metallic conductor. Otherwise, magnetic fields will largely pass right through. Since we're usually dealing with electro-magnetic waves, attenuating both electric (with a grounded metallic shield) and magnetic (with magnetically permeable material) fields is the most effective approach. Mu-metal is what they used to wrap around CRT display tubes to reduce the distortion effects of external magnetic fields on the deflecting electron beam painting the phosphor on the inner surface of the screen.

Aluminum Tin foil hats may actually increase rather than decrease the reception of signals.


The helmets amplify frequency bands that coincide with those allocated to the US government between 1.2 Ghz and 1.4 Ghz. According to the FCC, These bands are supposedly reserved for ''radio location'' (ie, GPS), and other communications with satellites (see, for example, [3]). The 2.6 Ghz band coincides with mobile phone technology. Though not affiliated by government, these bands are at the hands of multinational corporations.

It requires no stretch of the imagination to conclude that the current helmet craze is likely to have been propagated by the Government, possibly with the involvement of the FCC. We hope this report will encourage the paranoid community to develop improved helmet designs to avoid falling prey to these shortcomings.

When somebody tells you nothing is impossible, ask him to dribble a football.