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Sometimes you'll see a sharp line of echo extending directly away from a radar site. Usually this is produced by some other source of electromagnetic radiation. If the other transmitter is operating continuously, the radar will conclude that there's echo at all ranges and produce a radial line of echo on the display.
When the sources are terrestrial, they are usually well-known to the radar operators, and keep appearing at the same angle. Another excellent source of microwaves is the Sun. If the radar happens to point directly toward the sun, as is likely just after sunrise or just before sunset, the reflectivity pattern will feature a ray of strong "echo" extending from the radar toward the east or west.
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