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Interference from power lines?
(self.amateur_radio)
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It's definitely possible. I don't know if you have one of those portable shortwave receivers, but if you do, you could check the amateur bands with that and see the interference. Generally, you're gonna get more interference on lower bands such as 160, 80, and possibly 40. Then you will on the upper bands like 20, 15, 12, and 10.