CREATE TABLE table_18758 ("Frequency" CLOB, "Call sign" CLOB, "Name" CLOB, "Format" CLOB, "Owner" CLOB, "Target city/ market" CLOB, "City of license" CLOB)

What is the frequency of the Classic Country Krki-fm booster station?
SELECT "Frequency" FROM table_18758 WHERE "Format" = 'Classic Country KRKI-FM booster'
SELECT "Frequency" FROM "table_18758" WHERE "Format" = 'Classic Country KRKI-FM booster'