Emmis Communications, the 9th largest US radio network group is installing ad-insertion technology from dMarc, which Google recently bought for $1.2 billion.

More on the technology:

"[dMarc] RevenueSuite works directly through each radio station's digital
automation systems to automatically insert paid commercials into open and
unsold slots, thus maximizing the stations' sell-through and revenue
capability. As a ready-to-operate service with minimal operational impact,
RevenueSuite updates the traffic log, distributes pre-encoded creative, and
generates real-time affidavits for each station."