I thought the mic.com article was overall quite good. I must note that if the VLF radio theory is a consensus in the Hum community, then it is not a strong one. From what I can tell, few people are pursuing it. I think the simple acoustic low frequency sound explanation appeals to many hearers. Also note the possibility that VLF radio and pre-existing sub-audible low frequency sounds may be co-requisites. I also want to say that there may indeed be a small number of different types of hums. Until hard data is available, it is difficult to reject hypotheses.
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This facility is apparently open for tourists. I would very much like a Hum hearer to go inside for a little while and tell me…