Incidentally, there are already two antennae in the iPhone 5 (
split to the top and the bottom to avoid the 'death grip' issue) so it's a third antenna that they would have needed to add.
Also, this is an interesting take on why NFC wasn't included:
http://bits.blogs.nytimes.com/2012/09/14/iphone-5-nfc/
Quote:
It turns out that getting N.F.C. to work right with the new design of the iPhone wasn’t even possible.
Why not? Nokia’s new Lumia 920 smartphone supports N.F.C., and some Android smartphones do as well. The explanation is actually quite simple. The iPhone 5’s all-aluminum-and-glass body would block information from being transmitted to a terminal, according to Will Strauss, an analyst of Forward Concepts, a research firm that follows digital signal processing and chips.
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Graham