TP-Link Box 4G, LTE Router 4G 150Mbps WiFi N 300Mbps, 2 x SMA for External Antenna, 4 Ethernet Ports, Removable Antennas, SIM Card Modem for Any Carrier (TL-MR6400), Version 5 : Amazon.com.be:
What external antenna for the Tp Link TLMR6400 router
TL-MR6400 300Mbps Wireless N 4G LTE Router
TP-LINK TL-MR6400 Wi-Fi Router & 4G Omni Directional Cross Polarised LTE MIMO Antenna - 3.5 dBi - McGill Microwave Systems