Agreeing with ADTech, if you have driven a ground rod near your new antenna installation, for safety reasons, it must be bonded to the existing electrical service ground system. Per NEC 810.21 (J) & (K), a minimum, #6 AWG copper is required.
A coax grounding block should be installed (preferably outside, close to the ground rod) and connected to the grounding electrode system with #10 AWG copper (or better). (810.20 & 21)
http://forum.tvfool.com/showthread.php?t=901 (post #20)