The iShares S&P National AMT-Free Municipal Bond Fund (NYSEArca: MUB) gained 13% last year, according to Morningstar.
Muni bond ETFs have enjoyed a huge rally as rates drop to all-time lows. [Muni Bond ETFs on a Roll as Yields Hit Record Lows]
SPDR Barclays Capital Municipal Bond ETF (NYSEArca: TFI)
