You could always install the cable gland next to the vent, or anywhere else on the top of your side walls, and still avoid the hole in the roof.yes that's the better way to go. I was just trying to think of any options other than putting a hole in the roof. I think a wire thru the side vent might be asking for trouble. I was just thinking it could be snagged by a branch or something. So cable gland will do fine.
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