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Where is the alien gun in Fallout 3

Where is the alien gun in Fallout 3
The alien gun is found next to the crashed alien ship.
the video should help.
http://www.youtube.com/watch?v=UK-olyvHtvg You could just watch that movie or you know, just go north of the minefield intil u get to the powerplant then follow the power lines intil you start getting radiation then it should be around there. =)