The pilot of a tailwheel-equipped airplane was departing from a remote off-airport site that was surrounded by tall brush. The pilot said that during the takeoff run, the left wing struck tall brush, which pivoted the airplane to the left, and it entered an area of heavy brush and trees. The airplane's right main landing gear collapsed and the airplane sustained substantial damage to the wings and fuselage. The pilot reported that there were no preaccident mechanical anomalies with the airplane. He did not submit an NTSB Pilot/Operator Aircraft Accident Report.