text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_52 (callsign VARCHAR, area_served VARCHAR, freq_currently VARCHAR)
  ### Question:
  What is the Callsign in Brisbane with a Freq currently of 4rph?
  ### Answer:
  SELECT callsign FROM table_name_52 WHERE area_served = "brisbane" AND freq_currently = "4rph"