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Some distant cable head ends are getting better results with digital than they did with analog, but I believe those results are reliable because the antennas are always mounted very high. In your case, you are over the horizon, and will quite likely see some time of day variations as refraction changes. Very early in digital, we did an experiment/demonstration from the PBS transmitters north of Milwaukee to an approximately 200 foot high (IIRC) receive antenna in Glenview, IL, a distance of about 75 miles. We were about 15 miles short of line of sight (this I do recall). We typically saw reception problems around 5-6 pm as the solar heating was lessening. There is no substitute for height, so I would recommend roof mounted, both because there will be no attenuation and because it's higher than the attic.
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