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Connecting external antennas (optional)
Your FX4100 cellular router is equipped with four internal antennas. In addition, the device has two external full spectrum cell SMA ports (0.6-6 GHz each) to support two external antennas.
To use external antennas:
1. Remove the SIM/EXTERNAL ANTENNAS cover on the back of the router.
2. Finger tighten your external antennas to the CELL1 and CELL2 external antenna ports.
3. Set the switch to EXT.ANT.ON. When enabled, each external port supports the full cellular frequency range of 0.6-6 GHz. Two of the internal antennas are disabled. The other two internal antennas remain active. An antenna icon 
appears on the main screen of the device display.
NOTE: Contact your Account team for more information about external antennas.