I built a simple Moxon antenna myself, and the SSTV image reception is quite good after some minor adjustments. However, when I measured it with a NanoVNA at 135MHz, the SWR was 1.014, but this curve seems very strange – it drops sharply and then rises steeply in a straight line. Does anyone have any suggestions? What could be the problem? The best performance would be to maintain a relatively low and smooth standing wave within the U and V bands, right?
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