Word games. There hasn't been an electromagnetic signal originating from a DEW LINE site in almost 25 years that I know of. If they happen to now be re-using those ancient facilities for new detection systems, well ... that's not the DEW LINE.
I will admit, however, that perhaps these sites were specific to the air-breathing threat. Forgive my ignorance on that matter, as I was only involved in modelling the ACTIVE radar sites in the early 80's.
I have visited and bookmarked 'radomes.org' for later review.