<https://www.simplehamradioantennas.com/2020/06/vk2prc-half-wave-end-fed-vertical.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.simplehamradioantennas.com/2020/06/vk2prc-half-wave-end-fed-vertical.html>