I always thought that the iPhone 4 signal issues were overstated and people getting their knickers in a knot over something that can be fixed rather easily. Many people use a phone case or cover anyway and that alone makes the problem go away. In fact, reporters in countries outside of the United States such as Australia are claiming that they are seeing little to no signal issues with the iPhone 4. Could it be a shonky network in the USA?
Anyway, a few websites have popped up since the issue arose and a new contender is iBand Aid who is selling the Antenn-aid for iPhone 4, which is simply a vinyl sticker for your iPhone 4. They claim when it is placed over the lower left corner of your phone it should improve signal performance.
You can pick up a single kit that comes with seven stickers for 4.95 and 1.95 for worldwide shipping - that is about $9 USD all up. Of course, you could just take a random human band aid lying around the house and cut it to size and it wouldn't cost you a thing. But, I guess you do get a choice of several colors and they are already cut to the right size for you. Has anyone actually tried a band aid they have had laying around? Let us know!