3580 is a magic frequency, actually 3979.xx is the vertical (horizontal?) 
oscillator frequency in OLD tube TV sets.  I've been listening to that buzz for 
decades.
Best Holiday Wishes to all -   Monty  K2DLJ

O That said, I'm  
> seeing some noise on 80m that is always present at night, on 3580 khz  
> and other places. 
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