Check out the iPhone 4 antenna kit that is designed to fix the problems with the iPhone 4 signal. The antenna kit attaches to the dock connector on your iPhone 4 and includes a lengthy cable with a long antenna attached.
By taking the antenna away from the phone allows for no drops at all in signal strength always ensuring you get to make calls when you want.
Yeah OK, it's really just a joke photoshopped together for a little fun by the guys at Fosfor. You really can't buy it from the official Apple store.