Flying around the area, I noticed this from the air - I have tried doing some searching but have been unable to find the name of the design or its specific use;
What is this massive antenna, and what is it used for?
There is also what appears to be a giant Yagi in the same field, see below StreetView image with both antennas visible.
Specifically, what would these types of antennas be used for? This is somewhat near the coast, (Seattle, WA) [47.493135, -122.253059] and also somewhat near an airport.
Are these somehow related to aviation? Early warning defense systems? General comms?
click the pictures for closeups, I can take actual pictures if requested