Typical SWR Curves for the Spider Antenna

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These curves were plotted with the antenna mounted in a typical mobile installation. The minimum SWR is at the point indicated by the arrow on the chart. The desired resonate portion of each band may be selected by moving the tuning sleeve up or down the resonator to place the minimum SWR wherever you choose to transmit. The entire curve will follow up or down the band according to where you move the sleeve for the minimum SWR.