AdExchanger reports on Google's TV ambitions. Specifically, the company wants a piece of the $70 billion linear TV ad pie -- of which $300 million-plus is addressable. At the National Association of Broadcasters meeting, Google announced the launch of an addressable TV product and DoubleClick Dynamic Ad Insertion, an update to DoubleClick for Publishers that prevents competing advertisers from appearing consecutively in the same TV ad pod and improves search for TV shows. DoubleClick Dynamic Ad Insertion puts Google in direct competition with video ad platform FreeWheel, which Comcast acquired in 2014.