http://daringfireball.net/2010/06/iphone_4 – “After using so much aluminum in recent hardware designs, it’s interesting that they’re using stainless steel for the iPhone 4. Update: Stainless steel can be used as an antenna; aluminum can’t. That’s the explanation.”
Don’t tell that to these guys: http://www.cushcraftamateur.com/
More likely explanation is that stainless steel is far more rigid.
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