Gather some stones, a log, and many sticks.
Step 1: Step 1
Find a body of water with fish.
Step 2: Step 2
Get you stones and make a oval as the picture above.
Step 3: Step 3
Get your sticks and line them up like the picture above.
Step 4: Step 4
Put the long in the opening that your oval stone wall should have.
Step 5: Step 5
Put bait (if you have any) in the funnel trap, and there you go!