The ProShares Ultra QQQ ETF ( QLD ) is a leveraged ETF that can be used to improve portfolio performance in positive momentum trends through tactical entries and with a relatively short horizon (3-6 months), while closely monitoring the macro narrativeAnalyst’s Disclosure:I/we have no stock, option or similar derivative position in any of the companies mentioned, and no plans to initiate any such positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am not rece ...