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The ground pin on an outlet is fine for an electrical safety ground, but useless for an RF ground. Way too long a grounding path, with too much series inductance to work properly. Using it that way will actually help couple RF into your powerlines, causing all manner of RFI problems.
A good RF ground needs to be short and direct, preferably using a low inductance conductor, such as flat copper strip.
Once a proper RF grounding system is installed, it still needs to be tied back to the building electrical service ground to keep everything at the same potential.
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