Pls donot follow any indicator blindly. Try to go deeper to understand what it is all about. OBV is a very simple indicator. What it does is that it adds value of volume of the last bar to its value in case of a green candle and substracts value of the volume in case of a red bar. So effectively it tells you about the buyers and sellers in the market. When buyers are more it goes up and vice versa. Now as Sanjoy was saying, you get terrific positional trades when there is an anomally. Pull out any daily chart of any instrument and you will find that the OBV bottoms out earlier than price. So there are times when the price is falling and OBV is rising. That is the best time to buy once price also gives confirmation. Take the example of TATASTEEL. I still remember when it was at around 280 odd the OBV bottomed out and there was a considerable addition in OBV daily whereas price was going down(Informed or institutional buying was taking place) I distinctly remember the price went down to Rs.200 and then started moving up. All this while the OBV was also moving up. Then the price reversed and made a double bottom but the OBV did not fall by much. That was the best time to buy it for a positional trade as OBV was giving confidence. Tata steel has not looked back since then.