Even though WLW was now using ten times the power, listeners subjectively said it only sounded two or three times louder than before. One important factor affecting long-distance nighttime coverage was the power upgrade included a switch from a horizontal "flattop" antenna to a vertical tower, which significantly helped the local "groundwave" coverage, at the expense of reducing the increase in distant "skywave" signals. Even so, one listener remembered being able to easily pick up WLW's nighttime signal 1,100 miles (1,765 km) away in Denver, Colorado. Another issue was that some of the earliest towers like WLW's were being built too tall, which at night caused cancellation issues where the groundwave and skywave signals interfered with each other causing excessive fading. Because of this, WLW's tower, originally at 831 feet (253 m), was reduced to 747 feet (227 m).