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sirio 1/2 & 5/8 gp27's are a step up in quality from the cheaper 1/2 & 5/8 gp27's, that's not to say they are good quality like an i10k but better than a modern venom/silver rod.
The S-827 is a better 5/8 wave. Just make sure all 3 hex screws that make contact with the matching coil are tight. That includes the one under the bolt that holds the center pin to the coax connector. Remove the bolt and use the long end of the small Allen wrench supplied with the antenna to reach this screw.
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