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Antennagate affects 3G signal - it has nothing to do with any other reception, this would not affect an FM radio in anyway, and the iPod doesn't feature an external aerial. I'm pretty sure the FM radio will be there on the iPod touch if it exists on the nano - will wait for my new toy to arrive before confirming.
You are talking like an engineer and a technical expert and not a typical Apple customer. To them all antennas are the same. Not to mention typical Apple customers are hotter than most engineers.