Here's a list of Air Force Early Warning Radar Stations in Oregon. They're generally high up. Many are closed. I figure they might be good prospects for drone links, with direct RF, Infrared and optical connections.
https://www.facebook.com/sam.churchill/posts/pfbid024CC5BG9N3RGaE7T4i7ywvTcwaBheCE5ae5RyEX9VNVEJnN4LVdk6Hzyj3dLA6BBJl