CREATE TABLE table_79768 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" TEXT, "Class" TEXT, "FCC info" TEXT)

Name the call sign with frequency of 89.5
SELECT "Call sign" FROM table_79768 WHERE "Frequency MHz" = '89.5'
SELECT "Call sign" FROM "table_79768" WHERE "Frequency MHz" = '89.5'