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Transient surges in one of the overhead conductors, due to direct lightning strike, causes crosstalk in other adjacent conductors. This is a common phenomenon observed in power lines, communication lines and electrified railway lines. The presence of finitely conducting ground influences the magnitude and wave shapes of the crosstalk currents and voltages and this phenomenon has not received sufficient attention earlier. In this paper, we investigate the crosstalk in multi-conductor lines above finitely conducting ground as a function of ground conductivity, height of the receptor conductor, and position of emitter source. It is shown that ground conductivity has a significant influence in the amplitude and wave shape of the crosstalk currents in multiconductor transmission lines.