At 0744 Pacific time the airplane collided with an antenna and terrain during takeoff and initial climb. The solo Commercial pilot sustained minor injuries; the airplane was substantially damaged. Visual conditions prevailed for the Part 135 cargo flight. According to preliminary information provided by ATC, the airplane was cleared for takeoff on Runway 21 from intersection Charlie. The airplane failed to gain altitude and struck the glideslope antenna and a fence before coming to rest on a golf course located adjacent to the airport.