Philips Magnavox FW380C Manual De Instrucciones página 7

Note to the Cable TV system installer
This reminder is provided to call the Cable TV system installer's attention to Article 820-40 of the NEC that provides guidelines for proper grounding and, in particular,
specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical.
Example of Antenna Grounding as
per NEC - National Electrical Code