Griffin has released ClearBoost a case that captures wireless signal and sends it to your iPhones internal antenna.
This clever case conceals a built-in booster antenna that captures more of the available wireless signal and sends it to your iPhone’s internal antenna. The result is a better signal for your iPhone, especially in border areas—which translates to fewer dropped calls, wider coverage areas, and faster downloads.
Nothing to plug in -- just snap iPhone in ClearBoost’s durable polycarbonate case. Your iPhone gets protection from real-world hazards, and its antenna gets a boost.
Features: * Boosts the built-in antenna of your iPhone * Fewer dropped calls, cleaner signal * Wider service areas * Physical protection against bumps and scratches
This sounds like nothing more than a gimmick. It says straight on their website that :"With ClearBoost, you can expect to see improvements that won't necessarily be reflected in the number of bars on your iPhone." That's expected.
The problem with boosting the signal is that you are not just boosting the signal, you're boosting the noise as well. Your overall SNR will be relatively unchanged, and SNR is what most important in being able to get a good signal. This might, at best, get you some reception in fringe areas that you wouldn't be able to connect in otherwise, but it's not going to work miracles.