Exhibit 3.51


                            CERTIFICATE OF FORMATION
                                       OF
                            ACC WISCONSIN LICENSE LLC


         This Certificate of Formation of ACC Wisconsin License LLC (the
"Company"), dated as of December 11, 1998, is being duly executed and filed by
Kevin Saer, as an authorized person, to form a limited liability company under
the Delaware Limited Liability Company Act (6 DEL.C. Section 18-101, ET SEQ.)

         FIRST.  The name of the limited liability company formed hereby is:
ACC Wisconsin License LLC.

         SECOND.  The address of the registered office of the company in the
State of Delaware is c/o National Registered Agents, Inc., 9 East Loockerman
Street, Dover, Kent County, Delaware 19901.

         THIRD.  The name and address of the registered agent for service of
process on the company in the State of Delaware is c/o National Registered
Agents, Inc., 9 East Loockerman Street, Dover, Kent County, Delaware 19901.

         IN WITNESS WHEREOF, the undersigned has executed this Certificate of
Formation as of the date first above written.


                                                /s/ Kevin Saer
                                              -------------------------------
                                              Kevin Saer, Esq.
                                              Authorized Person


                                                           STATE OF DELAWARE
                                                          SECRETARY OF STATE
                                                        DIVISION OF CORPORATIONS
                                                       FILED 09:00 AM 12/11/1998
                                                          981476587 - 2977787