Antennaid Covers Your iPhone 4's "Boo-Boo"
Although this might look like a ridiculous joke, it's the real deal. Antennaid for the iPhone 4 is made to look like a Band-Aid and will hopefully fix your iPhone reception issues whilst making you look like a big baby. This might be a solution for you, however I would stick with a case for now. The people behind this do not claim that it will 100% fix your antenna reception. The Antennaid is made out of cut vinyl and is available in a pack of six, in six colors for $4.99.