Connection off 2 LTE mikrotik antennas to increase lte signals

hello guys,
i have my house in the area where is internet connetion only over mikrotik LTE router possible.
Currently i am ussing Mikrotik ANTENNA WRL ATL LTE18 KIT/ATLGM&EG18-EA MIKROTIK with 4 mimo antennas.
(https://www.amazon.de/ANTENNA-LTE18-ATLGM-EG18-EA-MIKROTIK/dp/B0BZQN5V7L). This router has ARM Cpu and BacktoHome VPN solution that i use.
It works but i want to increase speed and signals to get better and stable connection.

I have aditionall second MIkrotik Lte router RBLHGR&R11e-LTE with MikroTik_CP_2.160.000_v021 lte firmware and last 7.18.2 board firmware.

My questuion is: It is possible to use RBLHGR&R11e-LTE as second lte antenna for my main ATL LTE18 KIT/ATLGM&EG18-EA lte router?
i want to use signal from other sender that is placed on another side of my house, about 5 km away.I am hopping this will increase internet connection.
Is it possible to make RBLHGR&R11e-LTE as external antenna for RBLHGR&R11e-LTE and connect it over LAN/IP or if 2 pins soldering is requiered i am ready and have this knowledge.
Is there any way to use both antennas with 1 simcard ?
i am waiting for your answer.
thank you and best regards.
Mikrotik user with more that 10 mikrotik devices.

Both the devices you have are self-standing LTE routers integrated in a dish-like antenna.
They do not have connections for external antennas, and anyway antenna signals are not easily “moved”.
The way those devices are made is aimed to have the actual router as close as possible to the actual antennas, to avoid the loss of signal that an antenna cable would cause.
So, even if it was possible to add an external antenna to the LTE18 Kit, it should be connected through a very short cable, otherwise the signal loss would make it completely irrelevant, placing the antenna on the other side of the house would probably mean 10 or more meters of coaxial cable, so likely an attenuation in the order of magnitude of -5 dB or more.

hello,
thank you for your replay.
In my case the cable will be long about max 40-50 cm. I just need to turn second Lte antenas to the other direction where is second LTE transmitter placed.
How to conect the coaxial cable to the LTE 18kit? Does LTE 18 kit it support second pci slot where i can add aditional lte antena, or should i solder the coxial cable to the existing antena slot on the LTE 18 kit? Just remove the plastik and solder black wire to black and white wire to white ? Will this work?
Thank you?

You cannot “combine” two antennas pointed to two different towers, at the MOST you can add a second antenna (pointed to the same tower).
Some information on the internals of that device can be found here:
https://confusedbird.com/thread-310.html
Confusedbird is BTW much more oriented towards hardware hacks than the Mikrotik forum, so your questions may have better replies there.