Hi
I use Iskra P-60 MIMO with a factory cable of 10 m, 700-3800 MHz, you get two antennas, it works great, connect to the first and second SMA port. That’s for 2x2 MIMO.
If you want to use 4x4 MIMO, then two pairs of such antennas (4 antennas in total).
You also have to pay attention to the distance between the antennas, there is a table that determines the distance for the primary frequency. In my case, the primary frequency is B3 1800 MHz because it gives a large upload, so the distance between the antennas is 34 cm.
Of course, the choice of antenna also depends on whether you are in the city or in the countryside, I am in the countryside, so I chose these 
On only 4G with 2x2 MIMO, I achieve AVG 300/100 Mbps on 4 CA (B3+B1+B20+B28)
