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The groundplane kit on an A-99 does nothing to help reception or transmission, it will however help to reduce common mode currents on the coax cable.
If you run an A-99 and have issues with RF getting into the shack creating hums or squeals or other undesirable issues, then installing the groundplane kit will help eliminate those issues.

[QUOTE="BC Coyote, post: 854748, member: 66242"] The groundplane kit on an A-99 does nothing to help reception or transmission, it will however help to reduce common mode currents on the coax cable. If you run an A-99 and have issues with RF getting into the shack creating hums or squeals or other undesirable issues, then installing the groundplane kit will help eliminate those issues. [/QUOTE]

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