The hills/mountains between your location and Mt Wilson are the problem, not the distance. The strongest signals at your location are VHF, largely due to the effect that the obstructing terrain has on the UHF signals. UHF signals are more 'line of sight' than VHF and lower frequencies.
I can't offer much encouragement for an attic installation, even if there were no concrete tiles involved. The signal levels are simply too low.
I would try a Winegard HD7084P, Channel Master CM-3671 or Antennacraft HD1850. I would also include an Antennas Direct PA-18 preamplifier. Mount outdoors, clear of obstructions to increase your chances of success with the weaker signals.
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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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