AMEX:IWM ISHARES RUSSELL 2000 ETF
I am not trading this one directly (because market weakness, even though it is within the channel) but it helps me to trade QQQ and the SPY. I dont use true range directly but I search for lowest highs and read the tape in the candles tails or bodies + volume. I cannot be bearish totally on QQQ and SPY if I dont see a breakout down in IWM. I would buy this one aggresively if SPY and QQQ fail to continue lower. I always wait for my opportunies patiently.