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Heh. Side and back lobes are not optional, that's part of the physics behind antennas. All I was trying to imply was that even the more directive antennas I recommended will pick up signals from the back and off to the sides somewhat.
Many, but not all manufacturers provide graphs depicting the "antenna pattern" at several channels. Looking at one of those, you will see a main "lobe" where the peak gains are and several smaller lobes around the rest of the circle. The gain in those smaller lobes is much less than in the main direction. Since you have such strong signals in other directions, the sensitivity, as depicted by those other lobes, will be enough to pull in reliable reception.
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