The pilot reported that after landing at a remote off-airport site, he was informed by the site owner that the helicopter had collided with a wire during the landing approach. The pilot stated that "I didn't feel anything" when the owner of the field informed him that he struck the wires. The pilot reported that prior to departing on the next leg of his flight he performed a preflight inspection and found a "slight scratch on the tail rotor". The pilot stated that, "the helicopter sounded and felt okay" during the pre-takeoff run-up, and he departed for his home where the helicopter is stored. A post-accident inspection revealed that the helicopter sustained substantial damage to the tail rotor drive system. The pilot stated that there were no pre-accident malfunctions or anomalies that would have prevented normal flight operation.