Need to make your antenna go above the factory height? This extension masts can be used to lift the reach of your smaller marine antennas. By doing this, you increase the height above the water, and help clear obstructions that could interfere with your signal. Thus making your trip more fun and successful. Fits standard antenna mounts Great for clearing an obstruction One section Polycarbonate One inch diameter extension mast For light to moderate duty applications Excellent for Marine TV antennas