The signal levels shown in your TV Fool report suggest you will need to mount the antenna system on the roof rather than in the attic.
I would suggest a UHF antenna such as the Antennas Direct DB4e aimed at about 155° (compass) and a high-VHF antenna such as the Winegard YA1713 or Antennacraft Y-10713 aimed at about 205° (compass).
Combining satellite signals and OTA signals into a common coax is done with a diplexer (Holland STVC for example). However, in your case I believe you'll need to use a preamp such as an Antennas Direct CPA-19 which like most preamps, is powered via the coax from a power supply in the building. The satellite system already places power on the coax to power and control the dish components. I think you'll be best served by keeping the satellite and OTA antenna systems separate.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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