OTH-BOver-The-Horizon Backscatter (radar)
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ROTHR is a tactical land-based bystatic ionospheric backscatter system, similar in performance to the Air Force's OTH-B radar except that it can be dismantled and re-assembled on a prepared site.
In preliminary tests, targets the size of a cruise missile have been detected at ranges of 1800 miles by the OTH-B radar in Bangor, Maine.
When GE officially turned over the OTH-B radar to the Air Force, on April 24, 1990, in Bangor, Maine, it completed a contract that was started in 1975.