From Repair Mobile

Installation of a Nextel-iDen i60c/ i90c faceplate or antenna

1. mportant: These instructions are to guide you through the process and are to be used at your own risk. Do not poke at the circuit board! Do not have any other power source attached! A T-9* Torx Screwdriver bit will fit those tiny screws on the back of the cell phone to permit removal of the circuit board...
2. 1. Remove the battery and battery housing from the phone.
3. 2. Unscrew the antenna.
4. 3. Remove the silver antenna housing located in the battery compartment. More details [1] - thanks to aftermarketcellular.com