Summary: the nRF2401A, lots of Rs, Cs, and Ls (inductors), along with ATN1 which is a 50Ohm single feed 2.45GHz chip antenna . Probably more expensive than the strip of metal - but smaller. Now this is what I would expect from Apple - what looks to be a custom ASIC to run the nRF engine and to pass serial strings to/from the iPod (if Apple can shave $0.10 from the BOM, they
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Image originally found here.