They don't need to. 580 WDBO at 5kw off a tower on Lee Road is more than enough for the area it serves. Seriously, it's not all about power. It's about dial position, tower location, and daytime and nighttime patterns. As a comparison, 540 might have a full 50kw, but it's too low on the dial (ever heard the electrical interference during an afternoon thunderstorm on 540?) and it's towers are way out West of Orlando. Same goes for AM 620 in Tampa Bay... it's only 5-10kw... but it's signal pattern and tower location near the water allows it to be one of the best AM frequencies in Florida. All additional power gets you is a higher electric bill and by the looks of the ratings WDBO does just fine.