▁never ▁used ▁for ▁digital ▁TV ▁but ▁are ▁listed ▁here ▁for ▁theoretical ▁use . ▁ ▁In ▁certain ▁metropol itan ▁areas ▁of ▁the ▁United ▁States , ▁Ch annels ▁ 1 4 ▁through ▁ 2 0 ▁have ▁been ▁allocated ▁to ▁Land ▁Mobile ▁Radio ▁( L MR ) ▁use . ▁▁ ▁Ch annels ▁ 5 2 ▁through ▁ 6 9 ▁in ▁the ▁United ▁States ▁have ▁been ▁real located ▁now ▁that ▁conversion ▁to ▁digital ▁TV ▁was ▁completed ▁on ▁June ▁ 1 2 , ▁ 2 0 0 9 . ▁ ▁Ch annels ▁ 7 0 ▁through ▁ 8 3 ▁in ▁the ▁United ▁States ▁and ▁Canada ▁were ▁re - alloc ated ▁to ▁A MP S ▁cell ular ▁phone ▁use ▁in ▁ 1 9 8 3 . ▁ ▁On ▁August ▁ 2 2 , ▁ 2 0 1 1 , ▁the ▁United ▁States ' ▁Federal ▁Communic ations ▁Commission ▁announced ▁a ▁free ze ▁on ▁all ▁future ▁applications ▁for ▁broadcast ▁stations ▁request ing ▁to ▁use ▁channel ▁ 5 1 , ▁to ▁prevent ▁adjacent - channel ▁inter ference ▁to ▁the ▁A - Block ▁of ▁the ▁ 7 0 0   M Hz ▁band . ▁ ▁Later ▁that ▁year ▁( on ▁December ▁ 1 6 , ▁ 2 0 1 1 ), ▁Indust ry ▁Canada ▁and ▁the ▁CR TC ▁followed ▁suit ▁in ▁placing ▁a ▁mor ator ium ▁on ▁future ▁television ▁stations ▁using ▁Channel ▁ 5 1 ▁for ▁broadcast ▁use , ▁to ▁prevent ▁adjacent - channel ▁inter ference ▁to ▁the ▁A - Block ▁of ▁the ▁ 7 0 0   M Hz ▁band . ▁