CREATE TABLE table_75668 ("Call sign" CLOB, "Frequency MHz" CLOB, "City of license" CLOB, "ERP W" CLOB, "FCC info" CLOB)

Which Frequency MHz has a Call Sign of K218BE?
SELECT "Frequency MHz" FROM table_75668 WHERE "Call sign" = 'k218be'
SELECT "Frequency MHz" FROM "table_75668" WHERE "Call sign" = 'k218be'