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I think some have said its under the bezel where the front-camera is (as it decreases the WiFi's reception depending on the signal strength when covered).
 
I've heard that there is a small gap between the bezel or watev you call the front part and the chrome back. But that's only what I've heard
 
I think some have said its under the bezel where the front-camera is (as it decreases the WiFi's reception depending on the signal strength when covered).

If you put your hand over the top where the front facing camera is, the wifi bars drop down to nothing, so I'm pretty sure that's where it's at.
 
from the teardown photos the wifi antenna is (looking at the back) on the top right edge (reaching from the edge to the middle) just higher than where the camera in on the left side.
 
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