Originally Posted by
III Corps
But back to one of the AN2 owners. He was contacted by the DOD and they had him flying his AN2 around the hills of Asheville. They wanted to get noise and radar signatures because the N. Koreans were using them to infiltrate the south (Korea that is) and in the hills they were hard to find.

Supposedly the North Korean version used more wood and fabric than other versions and was thus more stealthy, but there was still that 1200 pound lump of an engine and large prop disk(although they may have used a wooden prop) to reflect radar energy.
For variants and history see:
Antonov An-2 - Wikipedia, the free encyclopedia
Lots of interesting stuff here on the joys of ownership:
http://an2flyers.com/
This one remains a mystery, with the original markings(which appear to have been oversprayed and then cleaned up with a rag soaked in MEK-don't ask), some other marks spray painted out and though it is being cared for(note the toy chocks and tiedowns) it has rested in the same place for years. Perhaps someone knows the story.