[davejacobson]

Tough situation. I have a couple questions. Where is the coax entering the house? If I read article 810 and 820 of the nec correctly from the mast of the dish the coax cable plus what is called the messenger (#14 wire) is all that is needed to the ground block. From the ground block you need #10 copper to the electrical ground in the house. If its over 20 ft you can drive a 8 ft rod in and then connect that to the electrical ground with #6 wire. If I am wrong I hope someone will correct me. The nec can be confusing to follow. Hopefully your installer will know,but don’t count on it

 

[davejacobson]

You must ground the coax with a ground block before it enters the house. here is some info from an electricians site that I belong to as a low voltage installer

Earth Grounding and Bonding of Communications Systems. The National Electrical Code required earth grounding of telecommunications [800-40(b)], antennas and lead-in cables [810-21(f)], CATV [820-40(b)], and network-powered broadband communications systems [830-40(b)]. This is accomplished by bonding the communications systems to the building earth ground.

The communications systems must be bonded to any of the following earth ground locations:

1. Building or structure grounding electrode system as described in Section 250-50.

2. Interior metal water pipe meeting the requirements of Section 250-104(a). The limitation of 5 feet in Section 250-50 does not apply.

3. Metal service raceway.

4. Service equipment enclosure.

5. Building or structure grounding electrode conductor.

6. Metal enclosure enclosing the building or structure grounding electrode conductor.

7. Accessible bonding means such as six inches of No. 6 copper conductor connected to the service equipment or raceway [250-92(b)].

I am not sure of your exact situation but a search of NEC 2005 with the above code references may help