Just a technical FYI - According to the FCC's own database, there are 277 listings for the State of Wisconsin for 154.570 Mhz. and Wal-Mart (anywhere in the state) is not listed as 'active', 'expired', or 'terminated'.
If they are actively using a non-licensed radio system, send a note about it to the FCC Enforcement Office at 1550 Northwest Highway in Park Ridge, ILL. They might like to know about it.
The secretary of our business radio service users group in Northeastern Wisconsin did the same thing regarding Sam's Club locally and the agency shut them down and issued a non compliance warning for non licensed operation and interferance. They were operating a 25 watt base and 31 - 4 watt portables inside the warehouse on another Itinerant-only frequency from a fixed location and without licensing. Corporate arrogance seems to be the pattern with Sam Walton's conglomerate.