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I expect leaning against a box is not a good idea. The antenna has a vertical aperture as well as horizontal, so it's basically pointing up into the sky and not at the horizon. I would rig a precisely vertical mast of some type - broomstick, plastic pipe, whatever - and mount the antenna in the center of as much free air volume in the attic as you can, and use a compass to point it at the stations you want. Stay clear of pipes, wires, chimneys, etc. and away from the structure.
You should be aware: effectiveness of an attic installation is difficult to predict. There are too many unknowns, in the material of the roof and structure, trees and buildings and other obstructions on the other side of the roof, and conductive and/or noisy wires, pipes, chimneys, etc. that are part of the building. Antennas are designed to function in free air, and you can change their electrical characteristics by placing them in other environments. Some building materials are more transparent to signals than others. Stucco, for example, contains wire mesh typically and is basically opaque to TV signals.
The DB4e is a very nice antenna, and should work well for you. You will gain a lot of signal by getting out of the attic.
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