What it is
When fish swirl and crash on a commercial, you can catch them on a pellet waggler — or you can catch them on a pole, shallower than you plumbed, with a short line and a regular feed. Shallow pole is that job.
You are making a column of falling pellets or maggots and putting a hookbait in it, at a depth you can actually hold. Slap the rig on the surface if they want the noise; leave it if they do not. Depth is the whole game, just as it is on a pellet waggler. Start two to three feet, then go shallower if they are swirling, deeper if you are foul-hooking.