A pair of XBee Series 2 radios with a wire whip style antennas, showing both the bottom/side (at left) and top (at right).
<a href="//commons.wikimedia.org/wiki/User:Naib" title="User:Naib">Mark Fickett</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>