I have extrapolated on today's knowledge to a high degree and it may bebeyond our current ability to judge the ef?cacy of such a system or something akin to it, but I can think of "no logical or scienti?c reason" (1)why it would be impossible. A device like this could generate an apparentobject in our atmosphere-a virtual spaceship, if you will. There would bevery little substance to a craft of this nature. It would mainly consist of astream of high-energy particles. Its low mass would allow extreme maneuvers. It could leave physical trace evidence and kill the engine of automobiles by inducing a current opposite to that of normal operation.Interaction with atmospheric gasses could cause a visible plasma display thatcould also appear on radar. It would be completely silent, and it would leave no hard physical evidence.

(1) Burleson, Donald, R. PhD. MUFON Journal No. 485 p. 10
(2) Marcel, Jesse A. Jr. M.D. et. al. The Rosewll Legacy. Helena, Montana: Big Sky Press
(3) Mason, Robert L. The UFO Experience Reconsidered. Mendocino, CA: SchoonerMoon Books, 2008
(4) Stewart, Eric. Rendsham File. Best UFO Resources: 2002 www.hyper.net