Another useful antenna for FM is a variation of the folded dipole. Actually, it's the other way around. The folded dipole is one of the variations of full wavelength loop style antennas. These can be in a variety of shapes..square, round, rectangular, etc...each one with slightly different characteristics. A square loop in diamond configuration..each side being about 30" of wire..and attached to a basic 4:1 balun..makes a useful antenna. You can tweak this for one end of the band or the other, and adjust for insulated or uninsulated wire, and few other factors. The actual length of wire is 10' and a few inches, but all 4:1 baluns have a stub of wire with spades on the 300 ohm side that can take care of the few inches. Use that 20ga clear insulated speaker wire and you can make this fairly stealthy for indoor use. Just need 3 push pins at the upper corners and you can hang it on a wall. The balun isn't totally neccessary, but provides a solid way to attach coax.