i found that wood palets work great, i use three and wire them up to look like a triangle. and add 2 foundation block, trust me 1 dosen't work, just makes a nasty floating hazard for boat to run into. i work for the ky. fish and wildlife. and every spring we put out thousands of christmas trees that we get from a local tree farm, we drill 1.5" holes in the base and tie a rope to the tree and concrete block it works well. but this is mainly used for crappie and bait fish, but were there is bait fish there are bass. also water willows work great for bass, they attract bass within days but after about 2 months they sour and the bass will leave for about 3-6 months.