What you see outside the cities/metro areas is offset and even overwhelmed by the democRATS in the cites. They don’t need to advertise, their support is Pavlovian.
The inner cities are a concern, but if we accept Clinton’s poll numbers despite the lack of signage, then we’ve also got to accept the poll numbers that say Trump is cutting into the African American vote up to as high as 15%. Obama took ALL of the AA vote. Sometimes he took 2% more AA’s than even existed in those precincts. :>)
One reason why Trump is going after the black vote. Get 20% of the black vote and he wins in a landslide.