Do NOT attempt to shove him in the crate. You WILL get bit. I learned the hard way when I tried to shove a pregnant female in a carrier while she was gulping down sardines. Since you don't know his history, the last thing you want is to get bitten. Rabies shots are NOT fun.

Call the Humane Society, ASPCA or shelter in your area to see if they have a Have-A-Heart trap you can rent. Usually they ask for a refundable $20 (in case you don't return the trap).

Do not feed him for at least 24 hours before trapping him. This way he'll be hungry.

Place the trap in the same spot where he's been feeding. Cover it with an old blanket or towel. Put a plate of sardines in the back of the trap. Take dead leaves or grass and cover the grates on the bottom of the trap, including the trip plate. Put a trail of sardines leading to the trap. Do this in the evening, at dusk, as that's when cats generally go looking for food.

Once in the trap, keep it covered so he'll calm down. It's normal for the cat (a feral) to thrash about the trap. Once you cover it, he'll calm down.

Good luck!!