Two that work realy well are the "Scantenna" or the Radio Shack 20-176.
Both work well to 400MHz then the scantenna works a little better higher up that.
If going the attic route becareful with the scantenna it is almost 5' tall.
You also might consider the Niljon, or if you have the vertical space, the Diamond discone. If you like a little homebrewing challenge, see the vertical dipole project a couple of topics down.
There are several good ones - it would help to know your interests...73s Mike