0 ) ▁may ▁be ▁used ▁by ▁both ▁commercial ▁and ▁non - com mer cial ▁stations . ▁( Note ▁that ▁in ▁Canada ▁and ▁in ▁Mexico ▁this ▁res ervation ▁does ▁not ▁apply .) ▁ ▁Origin ally , ▁the ▁American ▁Federal ▁Communic ations ▁Commission ▁( F CC ) ▁de vised ▁a ▁band plan ▁in ▁which ▁FM ▁radio ▁stations ▁would ▁be ▁assigned ▁at ▁intervals ▁of ▁four ▁channels ▁( 8 0 0   k Hz ▁separation ) ▁for ▁any ▁one ▁ge ographic ▁area . ▁Thus , ▁in ▁one ▁area , ▁stations ▁might ▁be ▁at ▁ 8 8 . 1 , ▁ 8 8 . 9 , ▁ 8 9 . 7 , ▁etc ., ▁while ▁in ▁an ▁adjacent ▁area , ▁stations ▁might ▁be ▁at ▁ 8 8 . 3 , ▁ 8 9 . 1 , ▁ 8 9 . 9 , ▁ 9 0 . 7 ▁etc . ▁C ertain ▁frequencies ▁were ▁designated ▁for ▁Class ▁A ▁only ▁( see ▁FM ▁broadcast ing ), ▁which ▁had ▁a ▁limit ▁of ▁three ▁kil ow att s ▁of ▁effective ▁radi ated ▁power ▁( ER P ) ▁and ▁an ▁anten na ▁height ▁limit ▁for ▁the ▁center ▁of ▁radiation ▁of ▁ 3 0 0 ▁feet ▁( 9 1 . 4 ▁m ) ▁height ▁above ▁average ▁terrain ▁( HA AT ). ▁These ▁frequencies ▁were ▁ 9 2 . 1 , ▁ 9 2 . 7 , ▁ 9 3 . 5 , ▁ 9 4 . 3 , ▁ 9 5 . 3 , ▁ 9 5 . 9 , ▁ 9 6 .