Oh so negative!

They correct statement is:

They work when standing still, but not when moving, due to limitations of ATSC.

So they work.
And remember that TV-in-motion is not allowed in many countries... I'm not sure of US-law...??

And it's not the lack of diversity tuner that is the problem - it's the technology in use (ATSC). Diversity helps but simply having diversity tuner without other black software and hardware magic won't fix it!