I have a hunter on one of my explorers. If you ordered it new from them (ebay store or website) it should come with there mounting kit. The 2 frame brackets attach behind the bumper to the frame. It will use existing hole in the frame for the long bolt, washers, and nuts that come in the package. More than likely you will need to notch the plastic tray under the radiator which is bolted to the bottom of the frame for the bracket to sit flush against the frame -- some people don't and then wonder why the guard feel loose. The bracket also uses one of the bumper mounting bolts (closest to the outside of the frame). These can be a headache as they often will just spin, requiring you to get behind the bumper cover with a socket or vicegrips to grab the nut (the keeper tab tends to rust out).
Once the bottom bracket is in place, there is a set of flat flat stock pieces which you bolt together and thread up from the frame to come out of the grill. Little hard to explain, but it makes sense when you actually look under the truck with the pieces in hand.
Once the brackets are in place, the guard is lined up and bolted on to it. Adjust to correct position and tighten. It's really not a hard install, but the guard itself is heavy/ackward so recommend having a buddy help hold it up while you attach the bolts.
I'll see about getting a couple pics after work tonight if nobody else posts some up this afternoon.