Take a couple cinder blocks,stack one on the other and tie them together. Then take a 20 ft piece of boo and run it 10ft through the holes in each direction.Once this is done tie either side of the boo together so that it won't be pulled out. This will make a 10x10x10x10 mat. Best if built on the bank and drug into the sweet spot. This works really well for springtime crappie.
