they have licenses for these freqs:
SIOUXLAND TAXI WPZP277 463.65000 2004-02-11 A 1 0 FB2 IG SIOUX CITY
SIOUXLAND TAXI WPYR301 464.40000 2003-10-03 A 1 0 FB2 IG SIOUX CITY
SIOUXLAND TAXI WPZP277 468.65000 2004-02-11 A 30 0 MO IG SIOUX CITY
SIOUXLAND TAXI WPYR301 469.40000 2003-10-03 A 30 0 MO IG SIOUX CITY
looks like your best bet will be the top 2