With the number of strong signals over a wide range of angles, what you need is NOT antenna gain, but wide range of sensitivity. Fortunately, these go hand in hand.
Although you do not need the Lo-VHF capability of these antennas, the inexpensive AntennaCraft AC9 or Winegard HD7000R should do well, and you should not need an amplifier. Start with an aim of 290 degrees and tweak to "fit". If you need a boost to feed your TV's then get a distribution amp.
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