What antenna for HUAWEI B529?

Hello,

I am looking for an antenna for the Huawei B529s-23a router. T-mobile operator. Below I attach ss from the location, the distance from the transmitter is less than 0.5 km in a straight line

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And information pulled from the router

How do you know that you are connected to this BTS and in the LTE800 band? Noi, what are your problems? At 500m to the BTS, the signal parameters are correct.

I honestly do not know, I'm not a specialist, but I assume that this is so since in the list above the given access point in the LTE band offers only 800. But can I be wrong, can I somehow check it?
I would like to buy the antenna, because even these funny lines (yes I know the lines are for women in pregnancy tests) do not show the maximum power. Somewhere I read that RSRP the less the better the same with RSRQ. So I thought that the purchase of the antenna and its appropriate setting will lower me these values, which will translate into higher speed, and / or smaller ping.
correct me if I'm wrong

Display B529 out the window and check how the signal and speed parameters will improve. Check if it works from http://www.mediafire.com/file/1yz26m6u8gfl16n/E5186_Toolbox_latest_v0.9.zip. After logging in to B529 in this program shows signal parameters, CTS BTS can be forced to LTE800 and LTE1800 and check both bands. LTE1800NetWorks is on BTS for PCK4a and Czarna Droga 1

Welcome back,

I provided the recommended app, and checked out all the parameters that were recommended. Unfortunately, I can not read the parameters, but maybe you can somehow raise the download (currently it is as you can see on ss). Since the spring came, it fell very much regardless of the time of day.