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_2638104_1 (callsign VARCHAR, channel VARCHAR)
### Question:
What is the call sign for channel 6?
### Answer:
SELECT callsign FROM table_2638104_1 WHERE channel = 6