That might work for me. I need something that actually lifts your hand away from the danger zone. I put three layers of electrical tape across the spot and it had no effect. I ended up putting a strip of sticky felt and that helped a great deal. The problem is it doesn't last too long coming in/out of my pocket and it leaves a stubborn residue.
I don't have antenna issues and I STILL want one. Just so when people make comments about my iPhone's reception issues I can say, "Don't worry, I got a band-aid for it."