For CATV, if the entry point block cannot be tied to the service ground within 20 feet,it has to have it's own 5/8X 8 foot ground rod.
810-15 and 810-21 deal with mast mounted antennas in the 1999 code.The code doesn't allow less than an 8 foot rod anywhere,although the local jurisdiction might.The specific article may be moved now since the code updates every three years ,but it never gets more lenient.
A homeowner erecting an antenna is not going to be inspected and he can use anything or nothing.
My advice from bad experience is,whatever you use,tie them together.
810-15 and 810-21 deal with mast mounted antennas in the 1999 code.The code doesn't allow less than an 8 foot rod anywhere,although the local jurisdiction might.The specific article may be moved now since the code updates every three years ,but it never gets more lenient.
A homeowner erecting an antenna is not going to be inspected and he can use anything or nothing.
My advice from bad experience is,whatever you use,tie them together.