However an "Intersystem Bonding Termination" can be installed on existing grounding electrode conductors and are quite reasonable (A few dollars) to purchase.  They can be found at an electrical supply company and are made to attach to existing wiring.

National Electrical Code references: Articles 250.50, 250.52, 250.53, 250.70, 250.94, 800.100(A), (B), (C) & (D), 800.106, 820.100.  Other articles and codes may apply depending on location, type of building and local code requirements.

Usually the "Intersystem Bonding Termination" would get attached to the grounding electrode conductor that is attached to a ground rod near the outside electric meter and the other utilities such as telephone and cable & satellite TV.  An additional "Intersystem Bonding Termination" could also be installed indoors near the electrical panel or near the water pipe ground connection if needed.

From the "Intersystem Bonding Termination" you would run a solid #10 copper wire to the cable TV terminal block or the satellite dish.  A #12 copper wire is sufficient for the telephone demarcation block.

Having everything grounded and bonded properly will help prevent damage or a fire from lightning.

Click here for more details on grounding and ground rods.