Fixed income investors looking for bonds with credit profiles comparable to Treasuries with the potential for added upside into year-end and beyond may want to examine mortgage-backed securities (MBS). That task is made easier with ETFs such as the WisdomTree Mortgage Plus Bond Fund (MTGP). This ETF hit a 52-week high on Monday, extending its year-to-date gain to nearly 4%. That's slightly better than what investors have earned with some of the largest passive aggregate bond ETFs. The Federal Reserve may cu ...