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Another way to increase cellular signal is to build a repeater with your own hands. To do this, you need to install two antennas (both inside and outside - see Fig. 1 and 2) connected by a cable. You can take two J-pole antennas at 900 MHz.
Even in such a specific and difficult situation as ours, a mobile repeater helped us to skip expensive roaming. We can finally enjoy a stable mobile connection with our home provider.