Which side of the GSM connection are you trying to build with the PlutoSDR? A UE or a BTS?
GSM is limited to ~ 40 km(?) of range via protocol timing limits. This is dependent on what's between the two antennas. for 40 km, you'd need a BTS antenna at 100m and a UE antenna that's line of sight, so flat terrain and no trees between the two.
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