Question about ZTE U50

Yes, you can connect external antennas to the router. It has two TS-9 connections to which external 5G antennas can be connected to improve reception. Suitable antennas are those with a TS-9 connection, for example MIMO antennas such as the Poynting MIMO-3-V2-12 or PUCK-2, although adapter cables (SMA to TS-9) may be required for the connection.