OK in that case it could have been a:
Chrislea CH-3 Skyjeep, but I'm not aware of one in the area.
SNCAC.854 a post WWII French Plane.
Well, those are the only two I can find that are single engine high wings with twin tails that don't use radial engines.
-Hey Bob, didn't Aeronca make a prototype with twin tails once?
Phil