The drone economy is taking off, and investors are getting more options to put money into the budding industry. The recently launched REX Drone exchange-traded fund, for example, has 80% of its portfolio earmarked for companies that generate the bulk of revenues from drones, unmanned aerial vehicles (UVA) and the companies that support the industry’s technologies.Ticker Security Last Change Change % DRNZ REX ETF TRUST DRONE ETF 18.62 +0.18 +0.96% "The drones theme is exciting for a couple of reasons," RE ...