Since GASZ got pulled off the market, there hasn't been an natural gas etf around that can neutralize contango of each rolled futures contract. I'd like to place a big long position on nat gas til at least Jan of 2017, but can't find the proper instrument to track NG prices. UNG will be affected negatively by 5% contango decay every month, and the 3x ETNs decay too fast for a long term trade as well. Anyone have any ideas?