@tubetime
AT&T Long Lines relay station?

(I remember reading about the system a number of years ago, and seeing a small photo, thought 'that looks like the tower right near me' in Seattle. It *was* the tower right near me. Sadly, said tower has since lost its old Long Lines microwave stuff...)

https://hackaday.com/2017/07/10/horns-across-america-the-att-long-lines-network/