Greetings Crabby,
Your TVfool plot gives you decent chance at successful reception. Of note in your information, NBC KNWA from Fayetteville will be completely ignored. Instead, FOX KFTA provides NBC programming on 24.2. This is where you'll get your NBC from.
This gives you a chance to utilize an Antennas Direct DB8e for your single antenna option. Orientate one panel to magnetic 20 or so. The other panel, orientate to magnetic 220.
This will ideally provide you the following signals:
ABC KHOG
CBS KFSM
FOX KFTA
NBC KFTA 24.2
PBS KAFT
KAFT PBS is broadcasting on real channel 9, a high-vhf channel, which the DB8e isn't designed for. However, you have a reasonably healthy signal for KAFT. It isn't unusual for a UHF antenna to receive a VHF signal if it is on the healthier side. With this recommendation, I'm working on the chances are good you won't need to add a supplemental high VHF antenna.
If you are intending on servicing 4 TVs, a distribution amp is good investment. The
channel master 3414 is a 4 way distribution amp.
I would not suggest a preamp. Double amplification can be tricky and if you don't absolutely need to do it, pass on it.
Run coax off single antenna to distribution amp. From distribution amp, run each individual coax to it's room/tv.
From there, I'll let others address you additional questions.
Cheers.