By 1935, the engineering staff of WGY began work to replace the T-top antenna system with a single vertical radiator tower. At the time, the station was plagued with signal fading at a distance of 30–100 miles (50–160 km) from the transmitter site due to cancellation by out-of-phase co-channel signals from the same source. The ideas for this tower were formed from experiments at WJZ in New York. From this, a square, half-wavelength (on 790 kHz) 625 foot (190 meter) tower was constructed in 1938. The half-wavelength design greatly reduced high angle radiation, thus solved the close in fading issues, and this antenna is still in use today.