Seeking Compatible External Antenna Models for TP Link TLMR6400 Router in Remote Area

Hi.
Colleagues, I need advice.
I live in a small town far away from transmitters.
Therefore, it needs to improve the quality of the Internet received, I thought about an external antenna, but I do not know what models will be compatible with the router I have - TP Link TLMR6400.
And which models will be really good.
I need help in this subject.
greetings

Added after 10 [minutes]:

Below I attach a picture of the inputs, the router may help.

Who needs a photo of this MR-6400? Here you need a location and an operator, and preferably signal, CID, BTS and speed tests. You won't check too much on the MR-6400.

I sent the photo so that the entrances were visible, as for the location, it is the village of Lisie Pole.
The operator is Play.

Let's start with choosing an operator, unfortunately not very happy. The nearest BTS is Chojna, about 8 km. All LTE bands work on it, i.e. LTE2600, LTE2100, LTE1800 and LTE800. You have a weak, residual range and rather only with LTE800, the slowest 5MHz band in MIMO2x2 and DL up to 37Mb / s. It can be overloaded. Another operator is selected in this area. In addition, the MR-6400, where does this router come from? you cannot select a specific LTE band on it, there is no signal diagnostics, only LTE 4 cat. and 100Mb / s LAN ports. Worth PLN 100-150. To play in this location you need an effective external, directional high gain antenna. but test signal and speed outside first, to test Android phone and Network Cell Info app. The DANe tab will show the eNB, BTS ECI, signal parameters and bandwidth. Plus speedtest. Take and show screenshots of them. Maybe it will be possible to connect to LTE1800.

Unfortunately, I will not change the router.
I attach screenshots.
I will be grateful for your help.

Added after 42 [seconds]:

And why the test with T-Mobile like internet on Play? Also, provide the exact location because you connect to the phone with the T-mobie card with BTS Banie on LTE1800NetWorks.

Sorry, mate mates for being misled.
I really mediate in this matter, hence the inaccuracies.
The town is exactly Żarczyn 74-121.
Below are screenshots taken on the correct sim card.

The phone in Play connects to the aggregation of LTE bands, on the first screen LTE2100 as the baseband and some others to it. the second is LTE1800, the signal is very weak. Home or outdoor test. You log in to BTS Banie, LTE2600, LTE2100, LTE1800 and LTE800 with aggregation are running on it. A bit of a road to BTS and through the forest. An optimal router would be the aggregation of LTE-A bands and the possibility of choosing a specific LTE band. But the basis is an effective directional antenna anyway to improve the signal, even up to the MR-6400. What speeds on the phone with these signal parameters on LTE2100 / LTE1800?

How can I check the speed?

Perform any speedtest on the phone, e.g. http://www.speedtest.net/pl and show the result.

Speedtest below.

Silence as a poppy seed, Mothers must have gone on vacation
Will someone recommend the antenna for the topic presented?

He did not go and he would be useful, but sometimes there is not enough time, people have problems, they still write on PW, on other forums. The speedtest shown is good, one is on a phone with LTE and a Play card? The second one on the right is made after WiFi from what network, router?

Yes, one on the phone with the play card inserted, and the other from the Tp Link TLMR6400 router with the same play card inserted.

There are two options, if you want to use all LTE Play bands available on BTS Banie is the 800-2600MHz broadband antenna. If you limit yourself to LTE1800, LTE2100 and LTE 2600, then the 2100-2600MHz antenna.

Could you please provide a specific model?
Which one would you choose in a specific option for yourself.

I would choose http://telkob.pl/inkontrahent.php?t=1682&g=363&q=&r=0&rg=0&sg= or https://www.cybertech.com.pl/p173,antena-dualna-lte-a- 4g-17dbi-despite-1800-2600mhz.html the cable is not longer than 10m and the shorter the better.

Thanks for the help

The first screen is the aggregation of lte1800 as the baseband plus an additional one from BTS Rybie, the signal at 1800MHz is weak, so probably even worse on lte2100 and LTE2600. The second is LTE1800 from BTS in Dawid, the signal is very weak. The phone is jumping between these BTSs. generally you can see that the potential on BTS is there, the one in Dawid is 5G ready on optical fiber. On MR6400 you will not use aggregation of 3 lte2600 + 1800 + 2100 bands or aggregation of 2 lte2600 + 1800/2100 bands. The LTE2600 band operates at 20MHz width and is assumed to be the fastest but has the smallest range, then lte1800 at 15MHz and LTE2100 at 10MHz. Dual LTE1800-2600MHz 17dbBi antenna from Cybertech. You will not force a specific LTE band on the MR6400, so it is not known whether you will connect to LTE2600 or LTE1800 or LTE2100, although there are good chances that the antenna will improve the signal at 2600mhz enough that the machine will log you into LTE2600.