Beyond 150 miles or so, ERP is what is most important. From SE Michigan for instance, WMBI 90.1 with 100000 watts, and WPWX 92.3 and WPPN 106.7 from the Chicago area with 50000 watts are easiest compared to the 6 kW or 8 kW stations from tall buildings. You just null out the stronger signals if you are far enough away, and in a direction you can null out.