Radio Radio.

Summer 2000 radio ratings from The Arbitron Co. were unavailable at press time. Look for those numbers here next week, too.

Meanwhile, Clear Channel Communications of San Antonio recently picked up three Jonesboro stations from Cumulus Broadcasting Inc. of Milwaukee. Cumulus purchased the stations -- KIYS-FM, 101.9; KBTMAM, 1230, and KFIN-FM, 107.9 -- from Duke …