Like many of the directional antennas authorized before 1941 when they changed frequencies under NARBA, the electrical spacings changed, usually increasing. In this case, the electrical spacing of the second tower went from 200 to 204 degrees. The electrical height of the second tower also increased from 90 to 91.9 degrees. Similar changes happened when the oldest authorized Directional Antennas in Michigan changed frequencies in 1941. WKZO 590 didn't change frequencies, so it was an exception. All the other old DAs were replaced in the late 1990s to 2000s, when they were authorized with high power. The next oldest were authorized after World War II. Others moved from Local Channels to Regional or Clear Channels after World War II.
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