Yes, it is very important to ground your outdoor TV antenna. Improper grounding can result in damage to the pre-amplifiers, coaxial cables, TV converter boxes, and even the tuner cards in your HDTV. The proper grounding technique is to run one ground cable from the mast to the grounding rod. This is to protect the outdoor TV antenna from lightning strikes. You can also add another ground cable from the ground block to the ground rod. On a proper installation the coaxial from the antenna should go to a ground block, then another coaxial into the house to prevent the excess of static electricity discharge. Static charges on coaxial can damage smart pass amplifiers!