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There are a couple of things. Radios of that era usually required a long wire (150-200 feet in length), and a good earth ground. The larger the antenna the better. You also have to remember that in 1930 broadcast radio was only 10 years old. There simply were not as many stations competing for spectrum space. So the band was much quieter than today. Later some powerhouse stations were granted clear channel status from the government. Here in my area WSM was a clear channel station on 650 am. There were no other stations on that frequency. You can still pick up WSM hundreds of miles away.
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