Shorting? ............. If you are planning to short a stock, check that the Down Aroon is crossing up through the Up Aroon, and begins moving above 70; this short sell indicator is especially useful when the market itself is in a downtrend. When scanning, look for the lines to cross in order to catch a trend change. Keep in mind that when following a bullish or bearish Aroon indicator, a trader may receive false signals. In this case, other indicators could be added to the scan to determine the cross strength.