Grounding a coaxial cable, or coax, by connecting its outer shield to a ground or earth reference point, can help prevent electrical shock, protect equipment, and maintain signal quality:

Electrical shock: Grounding provides a low-impedance path for current to flow in the event of a fault or short circuit.
Equipment protection: Grounding diverts electrical energy away from sensitive components and into the ground.
Signal quality: Grounding can help maintain proper signal quality.

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Custom Cut RG6 Coaxial Cable with Connectors and Ground Wire, Single, 3GHZ, 75 Ohm, Directv Approved