How do I replace the copper rim inside my iPod?

So, when I replaced my iPod's battery, I lost the copper rim that supposedly connects the WiFi antenna to the iPod. I know it's the copper rim since I actually read the teardown of an iPod Touch. I've heard that somebody had replaced it with a foil

bubble gum wrapper, but I'm skeptical. Now, please don't hate on me that I didn't try it out. Anyhow, all I want to know is how to replace that elusive copper rim.