If the antenna is outside, the coax shield should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety and to reject interference. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge which will tend to discourage a strike, but the system will not survive a direct strike.
It is possible to insert a coax surge protector, but a grounding block will satisfy the NEC requirement for an ADU (Antenna Discharge Unit).
Lightning strike density map:
http://forum.tvfool.com/attachment.p...9&d=1499441983