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The hanging it out the window part really isn't helping much, unless you live in a steel-framed building and your radio is a long way from a window or door.
Longer is better, higher is better, but if you go outside you really, seriously need to understand how to protect your receiver from lightning.
As far as how long and how high, as Sandy mentioned you can string a 15' long wire along the tops of some picture frames or curtain rods to get it up off the floor, and you'll be amazed by what you can pick up.
While longer is certainly better, beyond 50' or so you won't see much improvement on shortwave frequencies, and even at that length it will be highly directional. It will receive very well from directions perpendicular to the wire, and very weakly from directions along/parallel to the wire, so how you face it is very important.
Just try a 10-15' length inside your room, I think you'll be surprised.
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