If you can't view this video, please enter this title URL into your browser search box: https://www.youtube.com/watch?v=QAWZKKWumcY.
An excellent, informative video tutorial on how to tune a magnetic loop antenna. In this case, the mag loop is the LNR Precision Loop, which has a tuning control built in at the base of the loop. This loop is based on a design by W4OP. This mag loop allows adjustments of the coupling loop which is critical for magnetic loop antenna design.
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Aloha es 73 de Russ (KH6JRM).