Some 150 local TV stations have formed an online advertising network to get attention from national advertisers and reap the results of a booming internet ad market, AdWeek reports. The Local Media Network (LMN) would offer access to 20 million unique visitors per month to 147 local TV station websites, including ABC stations in New York, Los Angeles and Chicago, and those of several broadcast groups, including Landmark, Schurz and Liberty.

Advertisers will be able reach audiences by geography or through contextual and behavioral targeting, and can run online video ads. Verizon, Delta Air Lines and United Airlines have already signed up.

LMN is the latest entry into the ad network space. Behavioral-targeting firms such as Tacoda and Revenue Science are building ad networks, and Google is adding brand advertising to its AdSense network.