Radar multipath echoes from an actual target cause ghosts to appear below ground or very high up!
Original image: <a href="//commons.wikimedia.org/wiki/User:Lithium57" title="User:Lithium57">Lithium57</a> / English translation: <a href="//commons.wikimedia.org/wiki/User:MichaelBillington" title="User:MichaelBillington">MichaelBillington</a>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Multichemin.svg" title="File:Multichemin.svg">Multichemin.svg</a></li></ul>