[rabbit73]

Your signals are very strong and in the same direction, but your report assumes an outdoor antenna that is in the clear. How strong they are indoors will depend upon the construction. The tiles will block some of the signal, and if you have an aluminum radiant barrier in the attic, that will block the signals. If the walls are stucco, the wire mesh will block the signals, as will low-E glass in the windows. You must be prepared to do some experiments.

Most of your channels are UHF (real channels 14-51), but two of your channels are VHF-High (real channels 7-13). You will need an antenna for UHF and VHF-High.

In the attic I suggest a Winegard HD7694P. An antenna for the loft as a test might be a GE29884, which requires assembly if you are a DIY.

If you can't get an antenna to work inside, you will need a small antenna outside.

I wouldn't worry too much about the splits. Once you get good signals for just one directly wired TV, a distribution amp will take care of additional TVs.

What splitter/booster do you have now?