Here is an idea I played with last season with mixed results. My preferred bait for channel cats is fresh cut bait, usually sucker. I thought of trying to improve the bait's scent trail by adding a small chum type bottle a few inches up from my cut bait. I took a normal plastic prescription pill bottle and drilled it full of holes. I thread my leader through the bottom of the bottle and out the top. I place a small red bead about 4 inches up from my hook and run the leader through the bead twice to serve as a stop on the line to keep the bottle from sliding down to my hook. I fill the bottle with some type of scent bait - last year I used Berkley Catfish Chunks in the Blood flavor. I add a good fresh chunk of cut bait to the hook and with the chum bottle and the cut bait I make a pretty decent scent trail for the channels to find my bait. About the only hook I use for channels is a 3/0 to 5/0 Gamakatsu Octopus Circle hook. Last year I caught quite a few channels on this rig but I was also catching channels on my straight cut bait rod so I'm not sure if it helped or not. It sure did not seem to hurt. I've attached a picture of the finished product. Once you get the hang of making them you will find it only takes a few minutes.