Hi Seden,
I would suggest using radio telemetry to relay the sensor signals back to your base station. This should eliminate any noise or crosstalk that might come from using long cables (I presume you are referring to noise in sensor cables). To combat noise in the ground, I can only suggest the use of raw power to put as large a charge in the ground as possible during the "on period". Perhaps a gas-powered generator and a bank of capacitors would be appropriate.
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