USO has been stuck between a few critical Gann percentages. The 75% combination support/resistance level is a key breaking level for about 20-25% upside. This could be an interesting play should the Iranian issues drive up investor speculation in oil. I'm stalking this chart waiting for either weakness to the downside, or strength on a breakout above the ~$40 level. This is a very clear buy should USO drop to the ~$30 level again.