▁few ▁of ▁these ▁networks ▁have ▁been ▁able ▁to ▁gain ▁a ▁national ▁reach ▁on ▁par ity ▁with ▁many ▁of ▁the ▁conventional ▁commercial ▁and ▁non - com mer cial ▁networks , ▁in ▁part ▁due ▁to ▁the ▁fact ▁that ▁many ▁stations ▁transmit ▁high ▁definition ▁programming ▁on ▁their ▁main ▁feed ▁in ▁ 1 0 8 0 i , ▁which ▁requires ▁a ▁bit rate ▁less ▁compart ment al ized ▁for ▁allowing ▁more ▁than ▁one ▁mult ic ast ▁feed ▁( which ▁are ▁generally ▁transm itted ▁in ▁standard ▁definition ) ▁without ▁risk ing ▁dimin ished ▁picture ▁quality ; ▁some ▁altern ately ▁transmit ▁their ▁main ▁feed ▁in ▁ 7 2 0 p , ▁which ▁fav ors ▁multiple x ing ▁of ▁more ▁than ▁two ▁sub ch annels ▁at ▁a ▁time ▁( AT SC ▁ 3 . 0 , ▁which ▁began ▁development ▁around ▁the ▁time ▁of ▁the ▁ 2 0 0 9 ▁transition ▁with ▁F CC ▁consideration ▁to ▁replace ▁the ▁current ▁AT SC ▁ 1 . 0 ▁as ▁the ▁techn ological ▁standard ▁for ▁digital ▁television ▁expected ▁to ▁occur ▁in ▁ 2 0 1 6 , ▁util izes ▁improved ▁compression ▁technology ▁able ▁to ▁fit ▁additional ▁sub ch annels ▁on ▁a ▁single ▁programming ▁stream ▁as ▁well ▁as ▁allowing ▁for ▁the ▁transmission ▁of ▁high ▁definition ▁content ▁in ▁the ▁ 4 K ▁resolution ▁format ). ▁ ▁Ret ro ▁Television ▁Network ▁was ▁among ▁the ▁first ▁networks ▁to ▁be ▁produced ▁specifically ▁for ▁the ▁digital ▁television ▁market ; ▁Equ ity ▁Broadcast ing ▁created ▁the ▁network ▁in ▁ 2 0 0 5 , ▁originally ▁re lying ▁mostly ▁on ▁public ▁domain ▁series