For areas less than 5,000 sq. yards, a self-propelling aerator is best. These machines have a high productivity rate and coverage between 2,500 and 4,000 sq. yards per hour, depending on which model and working width you choose.For larger areas, tow-behind aerators are the best. These are also available with narrower working widths and are excellent for towing behind a riding mower. Smaller, tow-behind units like these provide high productivity, even in tight areas.