Radar multipath echoes from an actual target cause ghosts to appear below ground or very high up!
<ul><li><a href="//commons.wikimedia.org/wiki/File:Multichemin.svg" title="File:Multichemin.svg">Multichemin.svg</a>: <a href="//commons.wikimedia.org/wiki/User:Lithium57" title="User:Lithium57">Lithium57</a></li>
<li>derivative work:  <big><a href="//commons.wikimedia.org/wiki/User:%E2%9C%93" title="User:✓">✓</a></big> <small><sup><a href="https://de.wikipedia.org/wiki/Benutzer:%E2%9C%93" class="extiw" title="de:Benutzer:✓">B</a><a href="https://de.wikipedia.org/wiki/Benutzer_Diskussion:%E2%9C%93" class="extiw" title="de:Benutzer Diskussion:✓">ergi</a></sup></small></li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Multichemin.svg" title="File:Multichemin.svg">Multichemin.svg</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Multipath_propagation_diagram_en.svg" title="File:Multipath propagation diagram en.svg">File:Multipath propagation diagram en.svg</a></li></ul>