Adgate, who had been senior vp of corporate research director for Horizon Media, has taken a position as senior director of corporate research and media insights at Comcast Spotlight, the local cable advertising sales group.
He announced the move via a tweet on Twitter on Tuesday.
Adgate has been with Horizon for 17 years, involved in all aspects of media research -- traditional, digital and consumer -- as well as providing analytical support to planners, activation, digital and new business.
As the first dedicated research director of Horizon Media, Adgate -- among many responsibilities -- worked with primary research companies in developing media and product segmentation studies.
He maintained a high profile in the TV advertising business press.
Before Horizon, he was sales research director for five years at International Family Entertainment, participating in the launch of Fox Family Channel.
Adgate also held senior executive posts at Group W Satellite Communications, Turner Broadcasting and U.S. syndication company LBS Communications. Before this, he started on the media agency site, having research positions at Saatchi & Saatchi Compton and Backer & Spielvogel.