On June 27, 1993, about 1800 central daylight time, a home built airplane, N200D, sustained substantial damage when it collided with wires during the initial climb from takeoff from Wilke Field,near Omro, Wisconsin. The solo private pilot received serious injuries. Visual meteorological conditions prevailed for the local 14 CFR Part 91 flight. The pilot reported he took off to the west from the private, 1,300' grass strip. He states that upon reaching 50 feet, the airplane refused to climb any higher, and that he was rapidly approaching wires located at the end of the runway. He attempted to go under the wires, but was unable to avoid striking them. The pilot wrote in his report to the NTSB that he did not notice any decrease in power or RPM on takeoff, and that he believes the airplane was incapable of climbing any higher due to a down draft created by the westerly flow of wind over the trees located at the west end of the runway.