Barchart's Advanced Options and Covered Call Screener helps you find the best equity option calls using numerous filters to scan for those with a high theoretical return. Use the different Screeners to limit your risk by finding and writing calls only on the most favorable stock options.archart's Advanced Options and Covered Call Screener helps you find the best equity option calls using numerous filters to scan for those with a high theoretical return. Use the different Screeners to limit your risk by finding and writing calls only on the most favorable stock options.