I too do not care for the 3rd wire ground on an outlet for one thing if it is GFCI protected it may be a phantom ground. (often those are not grounded)
And a heating system pipe is another poor choice.. Unless you have tested and verified.
On receive, Noise comes in one of three ways
ON the power line
ON the antenna
Generated internally in the radio.
You need to find out where it's coming from..
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