According to Entercom its an advertising platform that will roll out on July 1st.

Entercom is introducing the Entercom Audio Network - a new national network that will allow advertisers to leverage Entercom's scale with targeted offerings across its portfolio of 235 radio stations reaching over 112 million listeners monthly. The Entercom Audio Network is set to launch July 1.
"As one of the two largest radio broadcasters in the country, Entercom has the scale and reach to offer national brands a very compelling and effective unwired network with our premier collection of leading radio brands across the country," said David Field, President and CEO, Entercom. "We cover close to 90% of people 12+ in the top 50 markets and we continue to invest in the best local brands and personalities to serve our audiences and our communities."