Since 1999, an ownership group is now legally allowed to own up to two signals in a market (which can amount to many more actual channels through digital transmission); since the early 1990s, some broadcasters have also used a shell company to circumvent certain ownership restrictions by way of a local marketing agreement; groups can cover up to 78% of the United States with their signals under the "UHF discount" (originally passed in 1985 to benefit UHF television stations that, prior to the 2009 digital transition, often had spotty signal quality), which allows broadcasters to count ownership of UHF stations by 50% of the station's audience reach.