On the Effectiveness of Aluminium Foil Helmets: An Empirical Study

Inquiring minds wanted to know, I guess. Gotta love this finding (from the abstract):
... certain frequencies are in fact greatly amplified. These amplified frequencies coincide with radio bands reserved for government use according to the Federal Communication Commission (FCC). Statistical evidence suggests the use of helmets may in fact enhance the government's invasive abilities. We speculate that the government may in fact have started the helmet craze for this reason.

However, I must take exception with their claim that

The 2.6 Ghz band coincides with mobile phone technology. Though not affiliated by government, these bands are at the hands of multinational corporations.

for mobile telephony in North America primarily uses 824MHz-894MHz and 1850-1990MHz frequencies. Think they need a better grade of tinfoil.