By Carla Pasternak Interest rates near zero and record-low U.S. Treasury yields make finding good income investments a bit harder these days. Don't get me wrong. It's still possible to find attractive yields, but you need to know where to look. Some of my best ideas for my High-Yield Investing and High-Yield International newsletters have come thanks to going off the beaten path and looking at asset classes overlooked by others. For example, I've locked in nice returns in the past by adding offbeat securities such as bank loan funds, trust preferred shares and master limited partnerships to my portfolios. And luckily for income investors, I'm still finding plenty of fertile hunting grounds out there. Here are five spots where you can still find double-digit yields.