What is the frequency of WMAD?
CREATE TABLE table_name_21 (frequency VARCHAR, call_letters VARCHAR)
SELECT frequency FROM table_name_21 WHERE call_letters = "wmad"
### Context: CREATE TABLE table_name_21 (frequency VARCHAR, call_letters VARCHAR) ### Question: What is the frequency of WMAD? ### Answer: SELECT frequency FROM table_name_21 WHERE call_letters = "wmad"