A funnel can be located any place that " funnels" deer
movement. The first thing I look at when I' m searching
for stand sites is creek crossings and erosion ditches.
Deep banked creeks and erosion ditches make deer
cross at certain locations...thus ' funneling' their movement.

The steeper the banks on a creek, the fewer deer crossings
there are. Fewer crossings=more deer using them.
Use the creek as a way to access your stand. Knee-high
rubber boots will come in handy.

We have lots of erosion ditches within the timber here
in Iowa. On deep ditches, deer are only able to cross in
two places...the top and the bottom. I prefer to place
my stands at the top because the wind is more consistent,
winds tend to swirl in low areas usually meaning 1-2
good hunts and then that stand is burned out. Last year
I shot a nice buck from a stand located at the top of one
of these ditches. The wind blows straight up the ditch and
takes my scent out into a open field. The deer come from
my left and right, forced to the top of the ridge by this
steep erosion ditch[:-].

Other funnels you can look at are; fence crossings, inside
corners (where a open field' s corner has timber/cover
on both sides), brushy fencelines, or just a piece of woods
that narrows down. Saddles are good also, just a depression
along a ridgeline that helps deer from being skylined -
mature bucks are notorious for using these.

Hope some of this helps &
Best of Luck!
TB