Spot on, Duke. Here ya go..I would bet that's not a real a/c, or even a model representing a real or developmental a/c. I think it's calibration shape used for radar cross section testing, or "pole cat" as the RCS guys call them. If this was an actual classified a/c, there's no way it would have been that accessible.
Mysterious Stealthy Shape That Resembles Future Fighter Concepts Spotted At Radar Test Range (Updated)
The apparent low-observable aircraft test shape appeared in broad daylight at Lockheed Martin’s Helendale radar cross-section measurement range.