Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23015 ( "Call sign" text, "Frequency" text, "City of License" text, "Licensee" text, "Format" text )

### Question ###
When 1180 am is the frequency how many call signs are there?

### Accurate SQL ###

SELECT COUNT("Call sign") FROM table_23015 WHERE "Frequency" = '1180 AM'