The primary focus of Jenn's research is to find an innovative power source for such a small aircraft. "If you use a battery, it's too heavy. Besides, batteries will not provide a lot of power for a long duration of time," he said. "(In our research) we're using an off-board source of energy. An antennae would track the vehicle and provide a microwave beam to provide energy to the vehicle. "One of the biggest advantages of using microwave power is that you can make these UAVs smaller and smaller. With a battery, if you continue making it smaller, you lose power."
You'd need a chemical power plant. Battery technology won't cut it (I design and fly lots of electric planes). I also doubt the wingspan claim.
The only way I can envision this working as claimed is to use a very high-speed dart-like vehicle, shot out of a morter, that used its initial velocity to maintain altitude.