▁a ▁principal ▁focus ▁on ▁comedy , ▁and ▁reform atting ▁the ▁Atlanta ▁signal ▁under ▁the ▁W P CH - TV ▁call ▁letters ). ▁ ▁Turner ' s ▁move ▁pione ered ▁the ▁super station ▁concept , ▁which ▁precip itated ▁other ▁independent ▁stations ▁– ▁most ▁not ably , ▁W GN - TV ▁in ▁Chicago ▁and ▁W OR - TV ▁( now ▁My Network TV ▁owned - and - oper ated ▁station ▁W WOR - TV ) ▁in ▁New ▁York ▁City ▁– ▁to ▁u pl ink ▁their ▁signals ▁to ▁satellite ▁for ▁red ist ribution ▁by ▁cable ▁systems ▁outside ▁the ▁station ' s ▁primary ▁coverage ▁area . ▁( The ▁practice ▁has ▁since ▁been ▁restricted ▁by ▁the ▁F CC , ▁although ▁six ▁stations ▁that ▁achieved ▁super station ▁coverage ▁prior ▁to ▁the ▁ban ▁[ including ▁W P CH ] ▁maintain ▁grand father ▁cla uses ▁to ▁continue ▁offering ▁their ▁programming ▁throughout ▁the ▁United ▁States ▁and ▁Canada ). ▁Other ▁national ▁super st ations ▁followed ▁W T BS ' s ▁lead ▁in ▁implementing ▁a ▁separate ▁national ▁feed ▁that ▁incorpor ated ▁substitute ▁programming ▁for ▁shows ▁seen ▁in ▁the ▁origin ating ▁market ▁that ▁local ▁stations ▁declared ▁themselves ▁to ▁be ▁the ▁exclusive ▁carri ers ▁in ▁their ▁market ▁after ▁synd ic ation ▁exclus ivity ▁reg ulations ▁went ▁into ▁effect ▁in ▁January ▁ 1 9 9 0 . ▁Since ▁W GN ▁America ▁( the ▁former ▁national ▁feed ▁of ▁W GN - TV ) ▁converted ▁into ▁a ▁conventional ▁cable ▁channel ▁in ▁ 2 0 1 4 , ▁no ▁national ▁super st ations ▁exist ▁in ▁the ▁United ▁States ▁and ▁the