The owner was the only person on board, and was using the turboprop airplane for a personal business trip. When he was about 10 miles south-southeast of the non-towered destination airport, he heard the pilot of a twin-engine airplane report that he was approaching the same airport from the north. The winds favored a landing on runway 32, and the turboprop pilot planned to fly a straight-in approach for landing on that runway. When the turboprop pilot was on about a 5-mile final for runway 32, he heard the twin pilot announce that he was on a left base leg for runway 14. When the turboprop pilot was on about a 2-mile final for runway 32, he observed the twin on his traffic display; at that time the twin was still about 6 miles out from the airport. Constant radio transmissions from aircraft at two other non-towered airports in the vicinity precluded the turboprop pilot from communicating clearly with the twin pilot, in order to coordinate their arrivals. However, based on the information from his traffic display, the turboprop pilot continued his straight-in approach for runway 32. Due to the distractions of the other airplane and the radio communication difficulties, the turboprop pilot forgot to extend the landing gear, which he did not realize until touchdown. The airplane came to rest upright and intact, about 50 feet off the side of the runway. The pilot was uninjured. Examination by a Federal Aviation Administration inspector revealed substantial damage to the fuselage and wings. The pilot reported that he had traveled internationally at least twice in the preceding weeks, and that he experienced some "mental fatigue." It was not determined whether or when the twin landed at that same airport.