I would start with moving the antenna to the roof or chimney, with the clearest line to the transmitters (avoid trees, of course), and searching around for a spot with the best reception. That C2 is a respected antenna, but if you need more gain, the DB4e has more than 4dB on the C2, at least from a glance at the published specs. And the DB8e has yet another 3dB. You don't need the VHF element that the C2V has, which simplifies things a bit if you're looking to buy. Use a clean run of RG6, straight to the TV, for testing.
It may also help to tilt the antenna back a bit, to aim at the top of the ridge between you and the transmitters, especially with a 4-bay, with its pointier gain vs elevation curve.
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