We may have hunted the same field, right in between Marion & Cibilo, TX.
Corn on the northern section (along the highway), maze on the south, big high wire running through the middle.
Sunflower fields under control of H&H Outfitters directly to the east. H&H had a lot more birds flying into their sunflower field, but I was still easily able to manage a limit, also H&H was much more expensive.
H&H outfitters:
http://www.hhoutfitters.com/doubleh/