If you're an investor looking for high-yield investments with some solid upside potential, there is perhaps no better place to look than the energy midstream space. The stocks in the space tend to have attractive yields, while the sector as a whole trades below historical multiples.The sector has gone through a transformation in the past decade, with midstream companies reducing leverage and being more disciplined when it comes to funding growth projects. By and large, the companies structured as master lim ...