75-ohm coax...
75-ohm RG-59 is typically a slightly larger diameter than 50-ohm RG-58.
Typically 0.242" vice 0.195".
It's a sufficiently large difference (24%) that I think it's fair to say it's obvious.
Even in isolation, without reference to the other.
There are other cable types of course, but these are the most common.
Biting the hand that feeds IT
