Slim Jim and J Pole calculator

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<blockquote class="wp-embedded-content" data-secret="MSl8B1JkqU"><a href="https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/">Slim Jim and J Pole calculator</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/embed/#?secret=MSl8B1JkqU" width="600" height="400" title="&#8220;Slim Jim and J Pole calculator&#8221; &#8212; M0UKD - Amateur Radio Blog" data-secret="MSl8B1JkqU" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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