Table schema:
CREATE TABLE table_name_22 (frequency_mhz VARCHAR, erp_w VARCHAR, call_sign VARCHAR)

Question: Name the total number of frequency Mhz for when it has ERP W of 1 and call sign of w215bj
SQL: SELECT COUNT(frequency_mhz) FROM table_name_22 WHERE erp_w = 1 AND call_sign = "w215bj"