Even if you do find a great funnel, not every deer in the area will use it. Prime example I cut a hole in a barbwire fence in a low spot at the edge of a field about 15 yards from my stand and alot of deer use that rather than jump the fence, mainly does and young ones. I have yet to see a mature buck go through it other than on my trail cam. I have seen them come up to the fence right there and check out whats in the field, then turn go down the fence about 35yards and cross. It seems to me that the bucks can see everything in the field from that spot while only exposing their head, and they cross at a high spot but is extremely thick with briars and locust trees. A funnel is anything that narrows down the travel route of deer, it can be a low spot in a fence, creek crossing, brushy fence line that cuts across a field, just about anything.