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You can try to build your own special mechanism to boost the cellular signal at home. To do this you will need: a piece of iron wire (35-40 cm), 2 connector blocks, small bolt and nut, 10 m of coaxial cable, a piece of a water pipe and a plastic container.
With an installed signal amplifier we have noticed a significant signal improvement at our working sites. I send you some pictures to show the installation we've made.