Concave With Crop Guidance Features

A concave for a combine harvester, the concave comprising:

• a first longitudinal member comprising a plurality of first longitudinal member wire guide grooves substantially at the same height position relative to a bottom of the first longitudinal member;
• a second longitudinal member comprising a plurality of second longitudinal member wire guide grooves substantially at the same height position relative to a bottom of the second longitudinal member;
• a first transverse member and a second transverse member substantially parallel to one another affixed to the first longitudinal member and the second longitudinal member;
• and;
• a plurality of module members affixed to the first and second transverse members,
• wherein the module members comprise a plurality of module member wire guide grooves, wherein at least two of the plurality of modular member wire guide grooves are at different height positions relative to the bottom of the first longitudinal member,
• a plurality of channels defined between the module member wire guide grooves,
• wherein a bottom edge of at least two of the plurality of channels have different heights relative to a bottom edge of the longitudinal members,
• wherein the plurality of channels are not parallel to the transverse members.