if you look closely at the pictures of the board http://onerng.info/img/BoardAndTinfoilHat-800.png http://onerng.info/img/BoardAndTinfoilHat-800.png there's a

if you look closely at the pictures of the board http://onerng.info/img/BoardAndTinfoilHat-800.png http://onerng.info/img/BoardAndTinfoilHat-800.png there's a folded dipole under the copyright message sticking out from under the shield The goal is to keep the internally generated noise inside, and to not couple into the antenna (where we're sampling external noise)