content: I would have thought they were part of the DEW LINE radars. Some of them are fixed but spaced in a "wall" every couple hundred km so that with their angle of emission, about a hundred km out they had overlapping coverage Edit - I stand corrected, you're right. https://www.flickr.com/photos/19787482@N04/3893021781 These were used to relay the detection radars data from multiple sites to a centralized station Either way very cool