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My usual suggestion for maximized reception with a plot like that would be a DB4e with the reflectors removed plus a VHF dipole.
For something out-of-a-retail-box, the C2MAX or C2V (reflectorless) would be my first choice, followed closely by the C4MAX or a C4V (reflectorless). The beamwidth of the C4/C4MAX is right on the edge of predictiability.
Many times, choppiness as you described is caused by factors such as trees shredding the signals. Being in an attic will exacerbate the problem by adding additional multi-path.
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