Update....
I decided to check out 1130 this morning at 5:30 (CST) before sunrise, and much to my astonishment, CKWX was comfortably on top! I certainly didn't expect THAT! First time I've ever heard them here, and this was on the SRF-37 Walkman. Unmistakable....news story about Canada politics followed by "1130 News time is 3:35" and then a report about snow in interior BC. Then they faded, and KWKH was in the foreground, but not particularly strong. No trace of WISN.
A little over an hour later, after daybreak but before WISN powered up, in my car on the way to my local health club, I checked out 1130 again. CKWX was on top once more....although weaker than before. Another hour after that, I got back in the car with 1130 still tuned. WISN was on day power/pattern, but with WDFN clearly in the background.
Ken Tucky said:
Before the switch in '65, they ran a top of-the-hour I.D. saying "Now building Wisconsin's first 50,000-watt station!" With all the expense & trouble involved, you wonder if it was really worth it...
I think it definitely was worth it. The daytime signal is a huge upgrade from what they had before. And on top of having a bigger overall footprint, they also got out of being stomped on by WJJD's splatter. They were certainly even more hemmed-in on 1150 than they are now on 1130. As for the nighttime signal, it's at least as good....and probably better...than what they had previously. Moving the transmitter farther south than they could have gotten away with on 1150 probably actually helped them in the southern reaches of most of the Milwaukee metro.
Its also worth noting that the stations WISN is protecting at night, for the most part aren't/weren't throwing much juicep towards Milwaukee in the first place. The result was that the channel was relatively clear at night....and in fact, still is relatively "slop free".
I'm not sure what WISN's ratings were like on 1150, but my guess is that they probably took a back seat to WTMJ, WOKY, and perhaps also WRIT and WEMP. When they first showed up on 1130, they were beautiful music....not unlike WAIT in Chicago. I'm also not sure how well they did with that, but I do remember from my summer job in college as vacation relief on delivery routes for Frito-Lay that I started to hear them on a lot of stores' sound systems around Lake and Northern Cook counties. Later, in the mid-70s, they were sort of an adult contemporary-oldies hybrid as "Radio 11". The station sounded really good then and seemed to be doing quite well. I lived in Lake Geneva briefly during that time and my wife & I had them on all the time. At least during the day. The nighttime signal was pretty much non-existent (even though I think that's when they may have been tinkering with 25kw).