1. Make sure the modem can acquire a signal/IP address
2. Open a web browser and navigate to http://192.168.1.254
3. Enter in “user” for the username and password
4. Configuration > Interface Setup > Internet.
5. Click antenna diversity
6. Change drop down menu from enable to disable
7. Click save config and restart
8. As modem is restarting you can cable up the new antenna to the male SMA connector on the left of the device