Documentally<p>Spent a good five hours attempting to fix my Sirio CX4-71 4m antenna. It's still playing up. This is me thinking out loud...</p><p>I took it down and checked for water. Cleaned off the corrosion between the sections and made sure the drain holes were clear. Coax tested fine and checked the plugs and changed both anyway. Then put it back on the mast and it's still got a high SWR. The mast isn't grounded but never has been. The radio is.</p><p>The only thing I have not done is retune the antenna as it was 1:1 before it went weird. That and recheck the coax with a dummy load on the end while giving it a wiggle and/or swapping the coax out completely. There might be a break somewhere.</p><p>It's a pain to lower the mast as there is so much other stuff attached to it. </p><p>Any other easy to check ideas also welcome. </p><p><a href="https://octodon.social/tags/HamRadio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>HamRadio</span></a> <a href="https://octodon.social/tags/4m" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>4m</span></a>, <a href="https://octodon.social/tags/Sirio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Sirio</span></a> <a href="https://octodon.social/tags/amateurradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>amateurradio</span></a> <a href="https://octodon.social/tags/G5DOC" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>G5DOC</span></a></p>