I'm looking for recommendations on cases that will provide the most improvement for the iphone's reception issue. I'm not interested in the best looking case, or the most rugged. Simply the one that makes the most difference in reception. Will plastic insulate the antenna better than silicone? Will a thicker plastic work even better? There is the Apple Bumper case at $30. The 'flexishield' for $2.99 on ebay. The 'black hard case' on ebay for $9.99 The 'air jacket thin clear' for $9.99 on ebay and probably many many more... Please respond with what you have tried and your results. Thanks. I'll start things off: I've tried the Apple bumper case and I would say it's a 70% improvement over no case at all. I may lose a bar or two, while trying to cover the antenna, as opposed to losing 4 to 5 bars with normal handling without a case.