You have a powered splitter, so you should be good there. Don't think you will need a preamp at 40ft with RG6 and a distribution amp.
Ideal to run RG6 cable.
I'd recommend a Winegard HD7694P. That is what I have. The distance to the towers for me is about the same as yours, but mine are not LOS. Mine are 1Edge with a couple 2Edge and they all come in loud and clear, even the ones in yellow. 70~100%. The stuff that is at 70% is hitting the antenna from the side.
Tough for $25, a Winegard HD7000R might be plenty enough for you.
Most your stuff is at 284° with some stuff coming in at 180°. This could call for two antennas. Though go over to
www.rabbitears.info and plug in your address. It brings up what networks you'd get just like everyone else, but it also shows what channels you'd get and what broadcasts on each channel. I'm thinking that everything at 180° will just be duplicates of what you will get at 284°.
Actually, just noticed, ABC is broadcast in Lo-VHF so will need a compatible antenna. Not sure about a Lo-VHF antenna.