Travel to Greener Pastures Disposal Site in the NE quadrant of the map. From the main building here face away from the door then go out the gate that is to your left. Follow this road as it turns WNW toward the large nearby power plant. As you near a bridge on this road you will pick up a radio signal from 'Recon Craft Theta'. From here there will be a destroyed house on your right, the UFO crashed through this house and is immediatly behind it. Take some Rad-x or put on a rad suit and go to the front to the UFO, the blaster and several Alien Power Cells will be lying on the ground next to a dead alien. Don't forget to scav the house as well, there is usually some good gear in a footlocker there.