LME 3-month copper falls below $6,600 on profit taking, last at $6,590/ton, down $53 on London PM kerb, says HK-based trader. Adds selling in aluminum, nickel inducing spillover long liquidation on copper, as base metal sentiment dampens, despite copper's overnight gains, better-than-expected U.S. housing data. Trader says copper well-supported between $6,550-$6,580, but break below that may trigger retracement to $6,400.