Dell OptiPlex 990 (Early 2011) - Manual (Page 50)

8. Remove the internal antenna.
Installing The Internal Antenna
1. Insert the internal antenna into the port in the chassis and slide toward the
right to secure it.
2. Thread the internal antenna into the chassis clip.
3. Connect the cables to the wireless local area network (WLAN) card.
4. Install the
drive cage .
5. Install the front bezel .
6. Install the cover .
7. Follow the procedures in After Working Inside Your Computer .
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