Huawei B818-260 improve LTE reception?

I have the Huawei B818-260 as a router.

Now wanted to inquire whether my LTE reception can be improved with 2 TS9 antennas? As far as I know my router has these two TS9 connections

Yes no! The external antenna certainly helps with LTE. Most of the time, however, the building shell, windows, other electronic or electrical devices or the mass of people cause a strong reduction in the radio signal. If you can place the antenna outside in the direction the radio signal is coming from, then this is probably the best.