AnandTech: The other thing the tape simulates is how the iPhone 4’s antenna would behave with a thick 1-mil (25.4 µm) coating. To test, I cupped the phone just like I did to cause the 24 dBm drop before.…The takeaway is that the best coatings Apple could possibly apply would bring the drop down to … Continue reading iOS 4.0.1 Signal Bars and Tape Reception Test