The ARC MBR1400 ships with 2 sets of antennas. The ARC CBA750 only ships with 1 set of antennas.
MBR1400 WiFi Antenna Conntectors
MBR1400 WiFi Antennas (3 are included with the MBR1400)
MC200 Modem Cap Cellular Antenna Connectors
MC200 Cellular Antennas
1. Match the antenna to the connector.
2. Connect the antenna and tighten by hand.