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Tube type radios can have very good performance. For an antenna, TV rabbit ears are very good. If the radio has a built in antenna connection for capacitive coupling to the powerline, this is usually pretty good for most fairly strong FM stations.
Is there a good strong sound of static when the volume is turned up...if not, there is probably weak tubes...usually when FM is weak, weak tubes are involved...a usual suspect is the mixer/oscillator and RF tube in the fm tuner, like 12DT8 or 17C9. You should be able to get all local FM stations clearly...the Zenith FM tube radios usually have better performance on the weak stations than most of the others such as GE, Arvin, RCA, etc.
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