Wilco are sometimes referred to as the "American Radiohead". In fact, this other Chicago band has a better claim to that title. While both bands have roots in traditional American music, Califone are far more experimental, and are more firmly planted in the European tradition as well
For me, in fact, that line straddling is problematic. They seem to be committed to neither tradition. Maybe it's just me, and I can't handle the cognitive dissonance. But I would rather that the music was either more traditional, or more experimental.