A Heathkit Shortwave Radio Receiver, Model GR-64:

This is a low-end receiver sold in kit form from 1964 to 1971, and it originally sold for $39.95. It covers AM (550kHz to 1620 kHz) and shortwave (1.5 MHz to 32 MHz) in four bands and utilizes four tubes (e.g., "Thermionic Valves").
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.