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And to add to this, co channel interference in that era was a very real problem, especially for viewers in between the two affected station signal. Those viewers had more interference issues than people living closer to either station. Short spacing is not good band planning, the recent years FM band debacle is a major reason why. Stations on a frequency need 50-100 miles or even a bit more depending on ERP, and also there needs to be reasonable interference protection. I think directional antennas are going to be a reality in practical terms for the FM broadcast band to have a chance at being usable. Especially for listeners who live between the two signals equally apart.
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