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Take a close look at the chart at the bottom of your report. You will see the channels and the part of the spectrum where they exist - VHF-Lo, VHF-Hi and UHF. You'll see there's nothing that you can receive in VHF-Lo. So that means an antenna that's rated for channels 7+ would be all you need. For example, the Antennacraft HBU-22 or the ANT-751; neither claim to be optimized for VHF-Lo, and that's fine because that's not critical for your reception. If you didn't have any VHF to watch, you could just look at a UHF only design. So those two antennas above would be good candidates for your situation if you want to replace the current one.
As for the coax, as long as it says RG-6. Double shielded is typical. You can order it online or pick up at local retailers. If you know the length of the run, try to buy a single strand that's closest to that length.
And yes, for now, leave the rotor out of the mix. I am thinking you won't need it. And that's a good thing because they're not surfing friendly. I'd start by aiming east and if you get everything from the Gastonia towers, the Charlotte towers will come in fine too. If you wanted to put the rotor back in, a couple short strands would do the trick easily after the fact.
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