A funnel is a place where deer travel that makes it easyer for them to travel or move undected. Like a flat between a steep slope and a top of a ravine. A narrow finger of woods or brush between a 2 larger woods. A small area of gental sloped creek bank on a steep banked creek. A saddel on a ridge. A loging tow path on a steeply sloped hill side. A narrow edge cover between a feild and a steep slope or dence brush. Or my favorit a hole in a fence that blocks deer travel. These are just a few funnels or pinch points.