here are the weekly Gann angles and 2 big Gann resistance levels figured off the 2 major lows in this bull campaign

The declining 2x1 is in charge until it isn't
1515 is 50% retracement....a strong bull will stay above this.The angle support is 1498 and rising 5 pts every week.I'm leaning toward a fast move down to 1500-20 area if we get confirmation of a 3rd LH on the daily chart