What Bird Is That Forum

http://ebird.org/checklist/S284630513 The recordings are on this Checklist. Riley county in mid November. Was calling from this very dense grass of some sort in lowland river/lake channel area

Grasshopper maybe? Not sure what's most expected in the area, but it kinda sounds like an ammodramus/ammospiza flight note. Ultimately not identifiable though.

Thanks! I was hoping for NESP with the somewhat odd habitat but not really familiar with what they like anyway.