Into a lead-lined booth used for testing x-ray tubes. Actually, the radio was inside the booth, and I was outside with headphones cause to do otherwise would be stupid for even me.
As a young engineer I was studying low-level phenomena which might be precursors to catastrophic breakdown in CT tubes. Some common noise sources such as increased shot noise, particles flying around in the tube, fluorescence on the glass envelope, and gas bursts (arcing farts) all were detectable in the HF region, and sometimes in the FM band, before they could be observed on a 'scope.
That was a Sony ICF2002. I used this at work for about a week IIRC, and even though it probably got a good dose, it still works as well as it did back then. Which ain't saying much because it's a piece of crap.