It's just co-ax connected directly to the antenna, no balun. The co-ax is very old as I found it in father-in-laws garage about 20 years ago & don't know how long it'd been there for, I'll go & have a look in the loft to see if anything has come adrift.... I don't think I've ever seen a balun used over here, everyone just connects the co-ax to the antenna terminals, my FM antenna on the side of the house doesn't have a balun & works OK, the lightning didn't affect that...
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