A <a href="//commons.wikimedia.org/w/index.php?title=Very_high_frequency&amp;action=edit&amp;redlink=1" class="new" title="Very high frequency (page does not exist)">VHF</a> <a href="https://en.wikipedia.org/wiki/whip_antenna" class="extiw" title="en:whip antenna">ground plane antenna</a> for 156 to 162 MHz.  The vertical wire functions as a quarter-wave <a href="https://en.wikipedia.org/wiki/monopole_antenna" class="extiw" title="en:monopole antenna">monopole antenna</a>, while the downward sloping wires serve as a <a href="https://en.wikipedia.org/wiki/ground_plane" class="extiw" title="en:ground plane">ground plane</a> for the monopole.  The downward slope of the ground plane wires serves to increase the characteristic impedance of the antenna to make it a good match for the 50 ohm coaxial cable feedline.
<a href="//commons.wikimedia.org/wiki/User:F1jmm" title="User:F1jmm">F1jmm</a>
<span class="int-own-work" lang="en">Own work</span> • <span class="int-own-work">Self-photographed</span>