3 GHz Dual Ground BlockHigh FrequencyF Type 2 Port Ground Block Prevents Damage to Satellite TV Antenna Voltage Protect Connection Mount Outdoor Dish Digital Video Signal This ground block is used to ground coax cables from a multi-switch satellite dish or outdoor antenna. Used to ground and help protect fragile electronics such as satellite receivers and televisions from damaging lightning strikes and power surges. Rated 2.25 GHz