Although there's never been any question that there's something going on with the iPhone 4's fancy new antenna system, we really haven't seen any rigorous testing confirming that the issue is real, severe, and affects every phone. That just changed: Consumer Reports tested three iPhone 4s and several other AT&T phones in their RF isolation chamber that simulates varying levels of signal from every carrier, and found that the iPhone 4 was the only handset to suffer signal-loss issues. What's more, CR directly says that its findings call Apple's explanation of a miscalculated signal meter into question since the tests "indicate that AT&T's network might not be the primary suspect." CR found that simply putting duct tape over the bottom-left corner is enough to alleviate the issue -- we're guessing that's Jony Ive's worst nightmare -- and says that while the iPhone 4 has the "sharpest display and best video camera" of any phone it's tested, it simply can't recommend the device until Apple comes up with a permanent and free fix to the antenna problem. Ouch.