I recently compared the signal strength of my white G2, with an Incipio Feather Case, to the signal strength of a display model at an at&t store. My phone was getting 108 dBm while the display was at 98 dBm. The next day I returned to the store and compared them again without a case on my phone. Both were at 98. In the process of doing this I noticed that the G2 gets a better signal when you are not holding it. It seems to suffer from the same antenna issues as the iPhone 4.
Sent from my Nexus 7 (2013)