MAX BR1 LTE Antennas

Good Day,

the BR1 has 2 antenna for cellular network. 1 Main 1 Aux.

What does mean?
One antenna per SIM?

I have to install the BR1 on board on a vessel.
Have I to put two external antennas? or the Main is enough?

Thank you

The LTE industry specification calls for a 2x2 MIMO configuration, but you can just use the Main antenna connection and it will work just fine.