If you use 558.3′ of wire, the impedance dips would fall around 1.8, 3.6, 7.2, 14.4, and 28.8. Of course, those are very rough estimates, as the usual 1005/f factor is only a ballpark, just like the 468 for dipoles, and is dependent upon the actual wire used (insulated has a slightly lower velocity factor), and the antenna’s environment.
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