At the Corner of Four Grid Squares

There's an old saw to the effect that a battle always occurs at the corner of four maps.  Same thing seems to go for ham radio events.  Take a look at where I'm planning on setting up for Winter Field Day this year:

EM70la, EM70ma, EL79lx, EL79mx: The campground is unevenly cut into four pie slices.  Just glad the formal exchange doesn't include the grid square, but it is nice to have if somebody from another contest wants it.