AAT is the nation's largest privately held provider of wireless tower sites, serving major wireless carriers and a premier group of site-management clients. AAT's current tower portfolio consists of more than 7,800 owned and managed sites throughout the United States. Date of initial investment: November 2003   Poindexter Systems is a leading provider of ad serving and optimization technology for online marketers. Poindexter's flagship product, Progressive Optimization Engine (POE), optimizes campaign performance by using sophisticated statistical modeling technology to deliver targeted ads. POE is seamlessly integrated with SmartServe, Poindexter's innovative ad serving technology. Date of initial investment: August 2004   Route 81 Radio, LLC acquires and operates community-based, locally programmed radio stations serving small-to-medium Arbitron-rated markets in the New England and Mid-Atlantic regions. Current stations are located in Elmira/Corning, NY, Wilkes-Barre/Scranton, PA, Harrisburg, PA and Philadelphia/West Chester, PA. Date of initial investment: January 2004   J Sports was formed to acquire and operate radio stations using ESPN Radio's full-time syndicated sports programming, together with local programming, in the Boston, MA market. Through an exclusive long-term licensing agreement with ESPN Radio, J Sports currently broadcasts on two Boston AM stations: WAMG 890 and WLLH 1400. Ranked as the 9th largest metro market in the U.S., Boston represents one of the largest remaining U.S. markets without a full-time ESPN Radio presence. J Sports may also look to expand into in other major radio markets. Date of initial investment: June 2005   Discover Media was formed to acquire the assets of Discover Magazine, one of the world's leading consumer science magazines, and among the top 125 consumer magazine titles in the U.S. Founded in 1980, Discover covers a variety of scientific fields as diverse as space travel, paleontology, and medical technology. Backed by co-investors WallerSutton and Sandler Capital, Discover Media acquired the magazine from The Walt Disney Company, and will likely seek to acquire other related media properties in the future. Date of initial investment: October 2005