Each antenna has a small hole...
... that fits over a locator peg at the top of the middle frame.
Before installing the antennas, make sure each antenna has a piece of grounding tape attached to the top.
To install the antennas, place each antenna over its locator peg and replace the grounding tape against the middle frame.
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Secure each antenna with a single screw.
Retape the left antenna connector to the middle frame.
Replace the antenna connectors back into the cable guides on the top edge of the middle frame.
Press the Mylar tape back into place over the cable guides.
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Retape the combined connector to the middle frame...
...and secure it in its cable guide near the motherboard.
Replace the antenna connectors to the wireless LAN card.