I may be stereotyping, but in my experience there is a strong ham community within the LDS Church. My first reaction was to assume something ham related, not drug cartel.
Some ham radio repeaters atop high-rise buildings I know of are kind of sketchy (such as when someone in the local radio club makes friendly with building engineers/management so they don't have to pay commercial leasing fees or go through HOA baloney, and will sometimes keep the location a secret to avoid attention), but the vast majority are listed on publicly available databases like RepeaterBook, ARTSCIPUB, RFinder, ARRL Repeater Directory, and/or each state's repeater coordination directory, or the AREDN mesh directory, or other ham radio WAN sites.
Since SLC is still totally clueless as to who put these up, it rules out LDS Hams for me.