However, radar sites can see above each other quite easily, and therefore not lose an aircraft as it flies through the other site's "cone-of-silence." In this case, airplane 4 is easily seen by radar B, although airplanes 1 & 2 are below the line-of-sight coverage of radar B due to the curvature of the earth, coupled with their lower altitude. Airplane 3 is just barely detected by site B.
So, remember the "red" chicken's eye? We'll view that from this angle also...
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