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Thanks to Ray Anderson, WB6TPU. Posted with Permission.

Some people use a separate DC and RF ground setup for their amateur
radio station. A section of coax, center conductor to equipment
chassis and out to earth ground. A capacitor is soldered, shield to
center conductor, acting as an RF Bypass thereby enabling the shield
to function as an RF ground, without sharing a DC Ground.
Is this a good technique for supressing RF in the shack and still
provide a safety, or EARTH ground? You Decide.
Here are actual RF measurements of this Grounding method.
[a line] DIRECTLY Connected DC and RF Ground:
[Direct Ground] CAPACITIVELY Connected DC and RF Ground:
[Capacitor Ground]
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