@Luca75 please tell me if you found a solution to your problem. I have a similar problem which requires cell lock.
https://community.tp-link.com/en/home/forum/topic/858060?moduleId=123

You may be lucky and the tower far away supports a frequency which the closer one does not have, so you could force that band.

In italy we have a site where you can check each BTS and their supported bands "lteitaly" (requires free account for all informations), may there is something similar for you in your country.

It will be a great feature : please add it !

I ended up buying an external directional panel router, and it brilliantly solved all my problems.

  Hello @Luca75 

Interesting, very, could you please share what model and/or brand did you use to get resolved this issue ? 

Is it an indoor or outdoor antenna ?

Thank you in advance

  @lohengrin1870 

In the end, I went with the Zyxel FWA710. It’s expensive, true, but the quality is obvious. In my opinion, it makes no sense to save 100 euros just to end up with a product that suffers in the heat or has unstable firmware: with this one, you install it, aim it, and you're done.

I bought it from Getic because, honestly, I didn't trust Amazon for a piece of gear like this; products there are often items that were already tested and returned by someone else. With Getic, I had great service and the certainty that the box was sealed for the first time, even though they still offer a 30-day return policy.

I’ve been using it for a few weeks now and, honestly, I’ve almost forgotten it’s even on the roof. I think that's what technology is for: when you forget you even have a device because it never gives you problems, it means you bought the right product.

In terms of performance, the Cell and Band Lock make all the difference. My BTS is about 1.5 km away, but I have several other towers on the sides causing interference... by locking the cell, the result is excellent. At night I hit around 650 Mbps, and even during the afternoon or evening, it never drops below 300. I’d much rather have rock-solid stability and run a direct LAN cable than mess around with RF cables and passive antennas just to squeeze out a few extra megs.