What antenna for the huwaei b525 lte advanced? and is it profitable?

Hello, I moved to Kamień Pomorski, I have orange mobile internet and a huawei b525 modem.
Internet test:


as you can see, the internet is very good for me, but there are fluctuations from 80mb / s up to 170mb / s but usually it is the limit of 100-115mb / s of download (move the router left to the right or forward backwards and the speed is already changing).
Can anyone know what antenna for this modem to extract the highest speeds and make the internet stable?
And is it really profitable, can the antenna help or not?
I have 1km to the nearest transmitter, from which I catch the Internet on the LTE 2600 band (30-40 mb / s download) LTE 1800 (15-25 mb / s) LTE 800 (20-30 mb / s). And on LTE-A it grabs me 80-170mb / s

Have you already received the answer, how much do you have for BTS at Sokolskiego 2?

1 km, but there are a lot of trees and a few single-family houses

I use LTE2600 + 1800 in Play without an antenna and I have very similar signal parameters. Generally, it is difficult to find an effective antenna for all bands. as a rule, they only move the signal pickup point to the outside and have little gain. Do what I wrote to you, test the B525 outside.

I'll do it in about two hours when I get home and give the results what and how.

Added after 2 [hours]:

Unfortunately, I cannot connect to this program