I don't know anything about the TNA except what I see on the charts. It hit its high back in 2011.
It's a bullish trading vehicle that is supposed to give you 3 times the bang for the buck on a daily basis. Swing trading a 3 times long or short trading vehicle loses its attraction for me in any period longer than a single day.
In fact I would not touch it at all. It is useful looking back on it though as it does illustrate on a longer term chart that not all is well in small cap land. That does not mean you can't make money trading it. I would just stick to a day trade.