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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.
Living in the suburbs of the city I suffered from poor mobile coverage. I'm grateful to my neighbour who recommended me the MyAmplifiers web store. Having installed the gsm repeater I've improved the signal from 2 to 5. Hope my photos will be useful for you.