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_7 (call_sign VARCHAR, owner VARCHAR)
### Question:
What is the call sign for the radio owned by astral media?
### Answer:
SELECT call_sign FROM table_name_7 WHERE owner = "astral media"