[WalterBright]

Wouldn't a metal frame act as a Faraday cage and block all radio waves?

[lostlogin]

A cage needs to be earthed - the rubber tyres probably hinder this, however I'm not an electrical expert at any stretch.

[WalterBright]

> A cage needs to be earthed

No, it just has to be around the object. Try wrapping your cellphone in aluminum foil. It won't receive or send anymore.