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Field adjusting a ground plane antennae

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Reggie_

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May 26, 2020
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I'm looking for info on how to tune a Commprod 266-70 Ground plane antennae. I had to take it apart to resolder the tuning stub which had broken loose. I put it back together exactly as it was,(I think) and mounted the 2 ground plane radials on the same position they were in on the mast. I just can't get it tuned to 172 Mhz which is where I need it. I've tried moving the radials up and down, also the vertical part. Any info or instruction sheet on this antennae would be greatly appreciated. Thanks.
 
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