It is a small general aviation
single-engine, two-seat, tri-gear, high-wing monoplane. The most
distinguishing features are that the canopy has a moderate "bubble"
shape, and the wings are swept forward about 5 or 10 degrees.

http://www.acf.clara.net/scale/scale-pics-1/high-wing/blowko/blowko.html

Sounds like it might be a Bolkow Junior.

John Dupre'