MAC US Wi-Fi card doesn't support channel 12

At one stage in my home network admin guru self exploration ride, I wanted to use channel 12 on my router, as somewhere I read it's best to use a channel that isn't overcrowded (since then I learned it isn't all that simple as just picking a channel that no other router around me uses, but a little more than that like overlapping wifi channels, and ways to avoid them [recommended read!]). So I set my router to channel 12 and was happy to acknowledge my (temporary) success.