Based on your report, the stations from Florence to your east are weak, 2-edge signals with co-channel interference warnings and the Charlotte stations are even worse. It would require quite an effort with large antennas and preamps to even have a reasonable chance of decent reception.
It sounds like you are getting good reception of most of the Columbia stations with the exception of 47 and 48 which would probably improve if you moved the antenna to your rooftop.
After moving the antenna to the roof, if you are still getting good signals on all the stations feeding just one TV, you could probably get by with a distribution amp to feed the signal out to eight locations such as the
Channel Master CM3418.