Its nightly prime-time schedule runs only two hours long on Monday through Saturdays and three hours on Sundays (something the network intentionally did to sidestep FCC regulations for television networks in effect at Fox's launch), and some of its major market affiliates used to broadcast on UHF before the digital transition (several affiliates though broadcast on VHF pre-transition, primarily as a result of affiliation deals with former longtime Big Three affiliates owned by now-defunct station groups New World Communications and SF Broadcasting that it signed after acquiring the NFL rights).