You could try a two meter beam, the frequency coverage is close enough to work up there. A combo TV/FM antenna should work, too. A TV antenna rotator should handle either easily.
Of course, you could roll your own. A couple of straightened out coat hangers cut to length for the elements, a chunk of pvc for the horizontal support beam, and a coax connector of your choice and bit of wire to feed the driven element. Mount it to a mast and you're ready to go. The neighbors might wince, but all the radio guys driving by will think it's uber cool.
Don't fall off the roof. These light antennas can have deceptive loft in a good gust of wind. You don't want to Mary Poppins yourself to a broken neck.