In article , wrote:
Special instrument approach procedures may be for a location that
doesn't have a public IAP or it may be at a location that does have a
public IAP. An example is KRNO where the special ILS lowers the
minimums by several hundred feet.

What lets a special approach get lower minimums? The nav signals are the
same, the runway is the same, the terrain is the same, so what's different
about this one operator with the special approach that lets them get lower
mins?