when the distance (graphically, on the chart) between the top of ADX and the low of the PPO (or also MACD) is at a minimum, then there is a good chance that prices will rise upward. If one thinks at the meaning of ADX and PPO it makes sense, I think. Another symbol is to look at might be NUGT (Direxion gold miners Bull 3X) .... nice to play with calls.