As the first "antenna case" for the iPhone, Griffin's new ClearBoost ($35) is a black plastic hardshell case with a metal and rubber antenna integrated into the rear housing. Designed to improve iPhone signal reliability and strength, ClearBoost is under semi-challenging conditions (2-3 bars of strength) actually able to add 1-2 bars of signal power to an iPhone, improving the performance of EDGE connections and phone calls, though it cannot generally…
