One antenna in the attic is not likely to cover a 100° arc reliably. Combining two UHF antennas (or two VHF antennas) requires filters, passive or active to prevent interference between the antennas. One antenna will receive a higher quality version of a given signal, the signal from the other antenna will act as interference if mixed together with the first.
I'd mount an RCA ANT-751 or Antennas Direct C2-V on my roof, using a high quality tripod and 5' mast. Bring on the wind and ice. A wet snow load on the roof would make for very poor reception if the antenna was stuck in the attic.
For reception from the south, I'd go big... A Winegard HD7698P and a decent preamp such as the RCA TVPRAMP1R or Channel Master CM-7778. Rather than trying to combine the south antenna with the west antenna, I'd opt for a separate tuner.
http://forum.tvfool.com/showthread.php?t=2882
Per
https://docs.sony.com/release/KDL26M4000.pdf pp. 42, your TV has an ATSC tuner and it covers real CH-2 through 69. An indoor antenna is subject to the interference produced by equipment in your home. That interference usually impacts the VHF band more than the UHF band. At least consider testing reception outdoors.