 The Feather NR-52 Blue Fruit LE is powered by the Nordic NR-52-832 chip, which comes with integrated BLE radio, supporting circuitry, and antenna. In order to have a look inside, we'll have to remove that shiny protective shield. A hot air gun should do the trick. There we go, nice and easy. And inside we find some capacitors surrounding the NR-52-832 itself, timing crystal with supporting caps, and some passive components along the antenna's feedline, and of course the antenna down there at the bottom.