A precast concrete barrier wall has been installed at a Somerset, New Jersey satellite earth station to eliminate signal clutter in the dense radio frequency environment of the New York-Philadelphia corridor. The wall is made of panels which are 18 feet high and 8 feet wide, each weighing 7.2 tons. The inner surface of the precast wall panels was designed with narrow horizontal planes set a two alternating angles to disperse any radio frequency signals entering the enclosure. A patented rotatable joint permits a variety of angles for panel connections. Steel cables secure the joint, yet allow future dismantling if necessary.