+ said:While it doesn't beat WMQM, KGOW in Houston has 50kw day, but cuts to 100 watts at night. However, they have a CP for 15kw at night.
It's a really drastic drop, as you say, but I'm fairly sure you'd agree that KGOW's 100-watt nighttime signal on 1560 is really pretty good over the central part of Houston.
To add a few details, they're non-directional from a site adjacent to their COL, Bellaire, using what amounts to a rooftop antenna with makeshift radials above the ground. It's actually pretty efficient, and how they got it approved was really interesting, too. With their CP for 1,000 watts hitting a roadblock from the Army Corps of Engineers they asked the FCC to approve the nighttime operation to coincide with the launch of their new all sports format back in August 2007. It took until mid-December to get it up and running, and after considerable effort they finally got approval for the 15kW in January of this year. Not bad for a station that began as a 500-watt daytimer in Port Lavaca, over 100 miles southwest of Houston.