I don't believe the dispatch centers hear any of this as they have some sort of UHF linking system between thier towers and the dispatch center thus only traffic on the local towers is heard. The Outagamie towers have 5 different mobile input PL's and each has a UHF link to the consoles.
Actually they had a UHF band (450-460mhz) linking system between thier towers and the dispatch center now it is all microwave I believe. And there are actually 6 different mobile input PL's for the input frequency of the repeater. 6 repeaters and 6 inputs might help with location determination also.
FD-1"Brown"DISP:
154.250/159.405 107.2pl on input GRAND CHUTE S.C. TOWER
154.250/159.405 025dpl on input BINGHAMTON CENTRAL TOWER
154.250/159.405 051dpl on input HORTONVILLE S.W. TOWER
154.250/159.405 031dpl on input KAUKAUNA S.E. TOWER
154.250/159.405 065dpl on input BEAR CREEK N.W. TOWER
154.250/159.405 043dpl on input SEYMOUR N.E. TOWER
154.250/153.890 OUT-FD "Brown" DISP (Airport)? never heard anything on that input frequency