I think I can definitely report that this is the Burien site that I'm seeing from the north end ferry dock on Vashon Island. This morning, I had a solid 4G signal until a ferry boat landed, blocking a direct line of sight to Burien, at which point the 4G signal dropped and 3G signal returned. When that boat left and the line of sight returned, so did the 4G signal. The distance appears to be slightly over six miles, as the crow flies.