Here's the rig I use most often (under ice or in open water).
Tandem tied large single hooks up 18" to a bead stop, an egg sinker, another bead stop another 18" of line up to a bead terminated to a swivel.
Drop the bait down and let them chew/take the bait feeling nothing but the weight of the bait (and a couple hooks) - as they begin to move and turn the bait and have a few feet of line slides through freely before the egg sinker is felt lifting off the bottom - at that point - he has it in his mouth and you are off to the races.
The ones in these pictures are a little shorter for use under the ice - but 24"-36" between beads is common for open water rigs - this one might have 16"-18" in the picture.
Line is 60 or 80 fluorocarbon leader material, hooks are tied tandem using a snell knot on each.