Gotta love these one-off inventions that are probably making a fortune. Here’s a vinyl sticker called “Antenna-Aid” that directly targets the iPhone 4 antenna issue. The tag line of “Apple made a boo-boo. Make it all better.”
The “Antenna-Aid” says it may improve signal performance when you put it on the lower left corner but it’s “for entertainment purposes only”. It costs $5 and you get 6 stickers in a few colours that can be seen with the human retina.