Hi Argon,
Rather than the fairly primitive length of wire, you might want to consider making a T-shaped dipole antenna, which will give you a bit more selectivity if you are able to position it so it rejects stations you don't want and receives stations that you do want. (A dipole FM antenna rejects signals in two directions and favors signals in the other two directions.) Also, running bare wire into your wall may pick up hum and interference from the AC wiring in your walls.
An alternative is a variation on the old TV "rabbit ears" type of antenna, which you can easily rotate to or shorten or lengthen the telescoping arms to favor one station over another. It is also a dipole but it's less cumbersome than the T-shaped piece of wire.
Dipole antennas are really only effective for strong local FM reception--about 15 miles or less from the transmitter. Anything beyond 20 miles, you're into "fringe" reception, and you'd need to consider some type of RV antenna or FM yagi in the attic of your house or on your roof.
Check out Radio Shack and other souces for various types. There are some small, rotatable attractive dipole-type antennas made by Terk, meant to sit on a shelf, although in my experience, they are only effective for fairly strong local urban reception.
Regards,
Alan
