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When I mess with setting SWR,using a Firestick-type antenna, in the fine tuning part, I can easily move the ratio back & forth by uncoiling the wire or re-coiling it. So sensitive and adjustable in fact, that I have to anticipate the final reading before I put the rubber cover over the tip 'cause that act also affects fine tuning. I also believe that you can re-lengthen the antenna by splicing the surgically-removed 6" of wire back onto the antenna. Of course, my business is not enhanced by selling you another antenna mast.