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Does tin foil block electromagnetic waves (to a notable degree)?

post #1 of 26
Thread Starter 
Nothing, just curious... Tin foil hats.
post #2 of 26
Yes. Aluminum or copper foil would likely be more effective though.
post #3 of 26
Do an experiment and surround your cellphone with it. See if you get signal.

:-P
post #4 of 26
Thread Starter 
Have cellphone not. I'll try a Wi-Fi emitter.
BTW, how to make a directional antenna with aluminium foil?
post #5 of 26
Depends greatly on the frequency (easier to attenuate high frequency signals) and whether the shield is grounded.
post #6 of 26
It keeps the MLB from spying on me.
post #7 of 26
Also it's dependent on the shape of the antenna as to the kind of signal it can/will pick up with the highest efficiency. Also the shape of the antenna will have an effect as well.
post #8 of 26
post #9 of 26
Quote:
Originally Posted by marvin View Post
Yes. Aluminum or copper foil would likely be more effective though.
tin foil is aluminum foil!
post #10 of 26
Thread Starter 
Quote:
Originally Posted by MCC View Post
Ah. I'll just wear a pair of Ultrasones from now on.
post #11 of 26
Quote:
Originally Posted by 3602 View Post
Have cellphone not. I'll try a Wi-Fi emitter.
BTW, how to make a directional antenna with aluminium foil?
Do a search. You can do that w/ a Pringles can.
post #12 of 26
Quote:
Originally Posted by beerguy0 View Post
Depends greatly on the frequency (easier to attenuate high frequency signals) and whether the shield is grounded.
It doesn't need to be grounded.
post #13 of 26
If you are in this thread, you might enjoy Improbable Research
post #14 of 26
Quote:
Originally Posted by Born2bwire View Post
It doesn't need to be grounded.
You're right, it doesn't need to be grounded, but in many instances, grounding can improve the shielding.
post #15 of 26
If you wrap something in anything metal it will form a faraday cage and block almost all EM waves. The object must be enclosed though. Not sure what that says about hats...
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