Taking the back off is easy, have you done so is the question. The wifi/bluetooth antenna defined: There are 5 very small pads (the size of a pinky nail), that connect to a piece of copper foil (glued to the backing), which are the antenna components inside the device. If you haven’t opened the device, And somehow these pads came loose you can shake the device and hear them rattle around (it’s pretty much the only things that could),