I don’t really understand freedom units but 40x60 feet sounds very wrong

Could be, but my dad would get old billboards to use as tarps for hay. The hay barn roof leaked so we had to cover the stacks inside. The hay barn was 60x100ft and we would get tarps that spanned the width, so at least 60ft.

I think they’re meaning the aspect ratio is not correct for 40x60. The sign would need to be taller for those measurements to make sense.