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This document could be improved by including information about where to acquire a replacement battery, and any modifications that might be required to a generic battery.
Look carefully at Step 7, second picture. The piece in the technician's hand contains the antenna. It is a black, flat metal piece riveted to that small module, with white writing on it. A similar style of antenna is used in the T-Mobile G1. The little round connector is an antenna connector. If I had to guess, there's probably a connector on the underside of that module to connect it to the antenna connector on the board.
The human body doesn't attenuate reception much at the frequencies used by mobile phones. By placing the antennas at the bottom, it reduces interference with hearing aids, because the antennas are farther away from the electronics in the hearing aid.
There may be other reasons, but those are the ones I know of.