AERIAL COMMUNICATIONS INC
S-8 POS, 1999-12-23
RADIOTELEPHONE COMMUNICATIONS
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                                         Registration No. 333-32743
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                 ---------------

                         POST-EFFECTIVE AMENDMENT NO. 1
                                       TO
                                    FORM S-8
                             REGISTRATION STATEMENT
                                    UNDER THE
                             SECURITIES ACT OF 1933
                                 ---------------

                           AERIAL COMMUNICATIONS, INC.
             (Exact name of registrant as specified in its charter)

              Delaware                                      39-1706857
    (State or other jurisdiction                         (I.R.S. Employer
  of incorporation or organization)                     Identification No.)

                     8410 West Bryn Mawr Avenue, Suite 1100
                             Chicago, Illinois             60631
               (Address of Principal Executive Offices) (Zip Code)

                         Aerial Operating Company, Inc.
                            Tax-Deferred Savings Plan
                            (Full title of the plan)

                               Donald W. Warkentin
                                    President
                           Aerial Communications, Inc.
                         8410 West Bryn Mawr, Suite 1100
                             Chicago, Illinois 60631
                     (Name and address of agent for service)
                                 (773) 399-4200
                          (Telephone number, including
                        area code, of agent for service)
                                 ---------------


================================================================================






<PAGE>



                             EXPLANATORY NOTE


     Aerial  Communications,  Inc. (the "Company") previously registered 300,000
Common Shares,  $1.00 par value,  ("Common  Shares") and interests  which may be
issued  pursuant to the Telephone and Data Systems,  Inc.  ("TDS")  Tax-Deferred
Savings Plan ("TDS Plan"), pursuant to a Registration Statement on Form S-8 (No.
333-32743).

     On September 17, 1999,  VoiceStream Wireless  Corporation  ("VoiceStream"),
VoiceStream Wireless Holding Corporation  ("VoiceStream  Holdings"),  a Delaware
subsidiary of VoiceStream  Holdings ("Sub"), the Company and TDS entered into an
Agreement and Plan of Reorganization  ("Reorganization  Agreement")  pursuant to
which Sub will be merged with and into the Company  (the  "Reorganization").  In
connection  with  the  Reorganization,  TDS  and  the  Company  entered  into an
agreement  providing that,  among other things,  the Company would establish its
own Tax-Deferred  Savings Plan and would cease to participate in the TDS Plan as
of January 1, 2000. As a result,  the  Company's  operating  subsidiary,  Aerial
Operating  Company,  Inc., has adopted the Aerial  Operating  Company,  Inc. Tax
Deferred Savings Plan (the "Aerial Plan"). All interests in the TDS Tax-Deferred
Savings  Plan held by  eligible  employees  of the Company as of January 1, 2000
will be  transferred  from the TDS Plan to the  Aerial  Plan.  The  Registration
Statement as amended by this Post-Effective  Amendment No. 1 covers the unissued
Common Shares and interests previously  registered under Registration  Statement
No.  333-32743.  The Common Shares and interests will be issued under the Aerial
Plan rather than the TDS Plan as of January 1, 2000.


                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS


Item 1.  Plan Information.*
         -----------------
Item 2.  Registration Information and Employee Plan Annual Information.*
         --------------------------------------------------------------
*        Information  required by Part I to be  contained  in the Section  10(a)
         prospectus  is omitted from the  Registration  Statement in  accordance
         with Rule 428 under the 1933 Act and the Note to Part I of Form S-8.


                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


Item 3.  Incorporation of Documents by Reference.
         ----------------------------------------
     The following  documents  which have  heretofore  been filed by the Company
with the Securities and Exchange  Commission (the "Commission")  pursuant to the
1934 Act, are  incorporated by reference herein and shall be deemed to be a part
hereof:

     1. The Company's Annual Report on Form 10-K for the year ended December 31,
1998.

     2. The Company's Quarterly Report on Form 10-Q for the quarters ended March
31, June 30 and September 30, 1999.

     3. The Company's Current Report on Form 8-K, filed on September 28, 1999.

     4. The description of the Common Shares,  par value $1.00 per share, of the
Company contained in the Company's  Registration Statement on Form 8-A, as filed
with the Commission on April 19, 1996.


<PAGE>



                  All  documents,  subsequently  filed by the  Company  with the
Commission  pursuant to  Sections  13(a),  13(c),  14 and 15(d) of the 1934 Act,
prior to the filing of a post-effective amendment to this Registration Statement
which indicates that all securities  offered have been sold or which deregisters
all securities  then remaining  unsold,  shall be deemed to be  incorporated  by
reference  in this  Registration  Statement  and made a part  hereof  from their
respective dates of filing (such documents,  and the documents enumerated above,
being hereinafter referred to as "Incorporated Documents").

                  Any statement  contained in an Incorporated  Document shall be
deemed to be modified or superseded for purposes of this Registration  Statement
to the extent that a  statement  contained  herein or in any other  subsequently
filed  Incorporated  Document  modifies or supersedes such  statement.  Any such
statement so modified or superseded  shall not be deemed,  except as so modified
or superseded, to constitute a part of this Registration Statement.

Item 4.  Description of Securities.
         -------------------------
                  See Item 3.

Item 5.  Interests of Named Experts and Counsel.
         --------------------------------------
                  Certain legal matters  relating to the  securities  registered
hereby have been addressed by Sidley & Austin, Bank One Plaza, 10 South Dearborn
Street,  Chicago,  Illinois  60603.  The Company is  controlled  by TDS which is
controlled by a voting trust.  Walter C.D. Carlson, a trustee and beneficiary of
such  voting  trust  and a  director  of TDS,  the  Company  and  certain  other
subsidiaries  of the TDS,  Michael G. Hron,  the General  Counsel and  Assistant
Secretary  of TDS, and the  Secretary or Assistant  Secretary of the Company and
certain other subsidiaries of TDS, William S. DeCarlo, an Assistant Secretary of
TDS, the Company and certain other subsidiaries of TDS, Stephen P. Fitzell,  the
Secretary or Assistant  Secretary of certain  subsidiaries of TDS, and Sherry S.
Treston, an Assistant Secretary of certain  subsidiaries of TDS, are partners of
Sidley & Austin.

Item 6.  Indemnification of Directors and Officers.
         -----------------------------------------
                  Article  XI  of  the   Company's   Restated   Certificate   of
Incorporation  provides for the indemnification of directors and officers of the
Company to the fullest extent authorized by the Delaware General Corporation Law
("DGCL").  Section 145 of the DGCL empowers a Delaware  corporation to indemnify
any persons who are, or are  threatened to be made,  parties to any  threatened,
pending or completed legal action, suit or proceeding,  whether civil, criminal,
administrative or investigative (other than an action by or in the right of such
corporation),  by reason of the fact that such person was an officer or director
of such corporation,  or is or was serving at the request of such corporation as
a director, officer, employee or agent of another corporation or enterprise. The
indemnity may include expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement  actually and  reasonably  incurred by such person in
connection with such action,  suit or proceeding,  provided that such officer or
director acted in good faith in a manner he reasonably  believed to be in or not
opposed to the corporation's best interests, and, for criminal proceedings,  had
no reasonable cause to believe his conduct was illegal.  A Delaware  corporation
may  indemnify  officers  and  directors  in an action by or in the right of the
corporation  under  the  same  conditions,  except  that no  indemnification  is
permitted without judicial approval if the officer or director is adjudged to be
liable to the  corporation in the  performance of his duty.  Where an officer or
director is  successful  on the merits or otherwise in the defense of any action
referred to above, the corporation must indemnify him against the expenses which
such  officer or  director  actually  and  reasonably  incurred.  The  Company's
Restated  Certificate of Incorporation  states that the right to indemnification
conferred in Article XI thereof is a contract right and includes the right to be
paid by the corporation the expenses incurred in defending  proceedings  covered
by Article XI in advance of their final disposition; provided, however, that, if
the DGCL  requires,  the  payment  of such  expenses  in  advance  of the  final
disposition  of a proceeding  shall be made only upon delivery to the Company of
an undertaking,  by or on behalf of an indemnified director or officer, to repay
all amounts so advanced if it shall  ultimately be determined that such director
or officer is not entitled to be indemnified under Article XI or otherwise.


                                       -2-

<PAGE>



                  In  accordance  with  Section   102(b)(7)  of  the  DGCL,  the
Company's  Restated  Certificate of  Incorporation  also provides that directors
shall not be  personally  liable for  monetary  damages  for  breaches  of their
fiduciary duty as directors  except for (i) breaches of their duty of loyalty to
the Company or its  stockholders,  (ii) acts or  omissions  not in good faith or
which involve intentional misconduct or knowing violations of law, (iii) certain
transactions  under  Section 174 of the DGCL  (unlawful  payment of dividends or
unlawful  stock  purchases or  redemptions)  or (iv)  transactions  from which a
director derives an improper personal benefit. The effect of the provision is to
eliminate the personal  liability of directors for monetary  damages for actions
involving  a breach  of their  fiduciary  duty of care,  including  any  actions
involving gross negligence.

                  The Company has directors' and officers'  liability  insurance
which  provides,  subject to  certain  policy  limits,  deductible  amounts  and
exclusions, coverage for all persons who have been, are or may in the future be,
directors or officers of the Company,  against  amounts  which such persons must
pay resulting  from claims  against them by reason of their being such directors
or officers during the policy period for certain breaches of duty,  omissions or
other acts done or  wrongfully  attempted  or  alleged.  Such  policies  provide
coverage  to  certain  situations  where the  Company  cannot  directly  provide
indemnification under DGCL.

Item 7.  Exemption from Registration Claimed.
         -----------------------------------
                  Not Applicable.

Item 8.  Exhibits.
         --------
                  The exhibits  accompanying  this  Registration  Statement  are
listed on the  accompanying  Exhibit Index. The plan is intended to be qualified
under  Section  401(a) of the  Internal  Revenue  Code.  The  registrant  hereby
undertakes  that it has  submitted  or will  submit  the Plan and any  amendment
thereto to the Internal Revenue Service ("IRS") in a timely manner, and has made
or will make all changes required by the IRS in order to qualify the plan.

Item 9.  Undertakings.
         ------------
The Company hereby undertakes:

    1.    To file,  during any period in which offers or sales are being made, a
          post-effective amendment to this Registration Statement:

          (a)  To include any  prospectus  required  by Section  10(a)(3) of the
               1933 Act;

          (b)  To reflect in the  prospectus  any facts or events  arising after
               the  effective  date of the  Registration  Statement (or the most
               recent post-effective  amendment thereof) which,  individually or
               in  the  aggregate,   represent  a  fundamental   change  in  the
               information   set   forth   in   the   Registration    Statement.
               Notwithstanding the foregoing, any increase or decrease in volume
               of  securities  offered (if the total dollar value of  securities
               offered  would not  exceed  that  which was  registered)  and any
               deviation  from  the low or  high  end of the  estimated  maximum
               offering  range may be reflected in the form of prospectus  filed
               with the Commission pursuant to Rule 424(b) if, in the aggregate,
               the  changes  in  volume  and price  represent  no more than a 20
               percent change in the maximum aggregate  offering price set forth
               in the  "Calculation of Registration  Fee" table in the effective
               registration statement;


                                       -3-

<PAGE>



    (c)        To include any material  information  with respect to the plan of
               distribution   not  previously   disclosed  in  the  Registration
               Statement  or any  material  change  to such  information  in the
               Registration Statement;

     Provided,  however,  that  paragraphs  1.(a)  and 1.(b) do not apply if the
     information required to be included in a post-effective  amendment by those
     paragraphs is contained in periodic  reports filed by the Company  pursuant
     to  Section 13 or Section  15(d) of the 1934 Act that are  incorporated  by
     reference in the Registration Statement.

2.   That, for the purpose of determining any liability under the 1933 Act, each
     such  post-effective  amendment  shall be deemed  to be a new  registration
     statement relating to the securities  offered therein,  and the offering of
     such  securities  at that time shall be deemed to be the initial  bona fide
     offering thereof.

3.   To remove from  registration by means of a post-effective  amendment any of
     the  securities  being  registered   hereby  which  remain  unsold  at  the
     termination of the offering.

4.   That,  for the purposes of  determining  any liability  under the 1933 Act,
     each filing of the  Company's  Annual  Report  pursuant to Section 13(a) or
     Section  15(d) of the 1934 Act (and,  where  applicable,  each filing of an
     employee benefit plan's annual report pursuant to Section 15(d) of the 1934
     Act) that is incorporated by reference in the registration  statement shall
     be deemed to be a new  registration  statement  relating to the  securities
     offered therein,  and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering hereof.

5.   That, insofar as indemnification for liabilities arising under the 1933 Act
     may be permitted to  directors,  officers  and  controlling  persons of the
     Company pursuant to the foregoing provisions, or otherwise, the Company has
     been advised that in the opinion of the Commission such  indemnification is
     against  public  policy  as  expressed  in the 1933 Act and is,  therefore,
     unenforceable.  In the event that a claim for indemnification  against such
     liabilities  (other than the payment by the Company of expenses incurred or
     paid by a  director,  officer or  controlling  person of the Company in the
     successful  defense of any action,  suit or proceeding) is asserted by such
     director,  officer or controlling  person in connection with the securities
     being  registered,  the Company will,  unless in the opinion of its counsel
     the matter has been settled by controlling precedent,  submit to a court of
     appropriate jurisdiction the question whether such indemnification by it is
     against  public policy as expressed in the 1933 Act and will be governed by
     the final adjudication of such issue.

                                       -4-

<PAGE>



                                   SIGNATURES

                  Pursuant to the  requirements  of the  Securities Act of 1933,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the  requirements  for filing on Form S-8 and has duly  caused this Post-
effective Amendment to the Registration  Statement to be signed on its behalf by
the  undersigned,  thereunto duly authorized,  in the City of Chicago,  State of
Illinois, on the 23rd day of December, 1999.

                                                   AERIAL COMMUNICATIONS, INC.

                                                   By: /s/ LeRoy T. Carlson, Jr.
                                                       -------------------------
                                                       LeRoy T. Carlson, Jr.
                                                       Chairman

                        POWER OF ATTORNEY AND SIGNATURES

                  The    undersigned    officers   and   directors   of   Aerial
Communications,  Inc. hereby severally  constitute and appoint LeRoy T. Carlson,
Jr.  and  Donald  W.   Warkentin,   and  each  of  them,  our  true  and  lawful
attorneys-in-fact and agents, with full power of substitution, to sign for us in
our  names  in  the  capacities   indicated   below,   all  amendments  to  this
Post-effective  Amendment to the Registration Statement, and generally to do all
things in our  names  and on our  behalf  in such  capacities  to enable  Aerial
Communications,  Inc. to comply with the  provisions  of the  Securities  Act of
1933, as amended, and all requirements of the Securities and Exchange Commission
in connection with this Post- effective Amendment to the Registration Statement.

                  Pursuant to the  requirements  of the  Securities Act of 1933,
this Post-effective  Amendment to the Registration  Statement has been signed by
the following persons in the capacities indicated and on the 23rd day of
December, 1999.



       Signature                                     Title
       ---------                                     -----
/s/ LeRoy T. Carlson, Jr.             Chairman and Director
- -------------------------------
    LeRoy T. Carlson, Jr.

/s/ Donald W. Warkentin              President and Chief Executive Officer
- -------------------------------      (Principal Executive Officer) and Director
    Donald W. Warkentin

/s/ J. Clarke Smith                   Vice President-Finance and Administration
- -------------------------------       and Chief Financial Officer (Principal
    J. Clarke Smith                   Financial Officer), Treasurer and Director

/s/ LeRoy T. Carlson*                 Director
- -------------------------------
    LeRoy T. Carlson

/s/ Sandra L. Helton*                 Director
- -------------------------------
    Sandra L. Helton

/s/ Rudolph E. Hornacek*              Director
- -------------------------------
    Rudolph E. Hornacek

/s/ James Barr III*                   Director
- -------------------------------
    James Barr III


                     Page 1 of 2 Signature Pages to Form S-8
                      Re: Aerial Tax Deferred Savings Plan


<PAGE>





/s/ Walter C.D. Carlson*              Director
- -------------------------------
    Walter C.D. Carlson

/s/ Thomas W. Wilson, Jr.*            Director
- -------------------------------
    Thomas W. Wilson, Jr.

/s/ John D. Foster*                   Director
- -------------------------------
    John D. Foster

/s/ Matti Makkonen*                   Director
- -------------------------------
    Matti Makkonen

/s/ Pertti Miettunen*                 Director
- -------------------------------
    Pertti Miettunen

/s/ B. Scott Dailey                   Controller (Principal Accounting Officer)
- -------------------------------
    B. Scott Dailey

*By  /s/ LeRoy T. Carlson, Jr.
- -------------------------------
      LeRoy T. Carlson, Jr.
      Attorney-in-Fact


*By  /s/ Donald W. Warkentin
- -------------------------------
      Donald W. Warkentin
      Attorney-in-Fact

      The Plan.  Pursuant to the requirements of the Securities Act of 1933, the
trustees (or other persons who administer  the employee  benefit plan) have duly
caused  this  registration   statement  to  be  signed  on  its  behalf  by  the
undersigned,  thereunto  duly  authorized,  in the  City of  Chicago,  State  of
Illinois, on the 23rd day of December, 1999.


AERIAL OPERATING COMPANY, INC.
TAX-DEFERRED SAVINGS PLAN AND TRUST

   By:  AERIAL OPERATING COMPANY, INC.,
        as plan administrator

   By:     /s/ Donald W. Warkentin
           ------------------------------
          Name:   Donald W. Warkentin
          Title:  President





























                     Page 2 of 2 Signature Pages to Form S-8
                      Re: Aerial Tax Deferred Savings Plan


<PAGE>



                                  EXHIBIT INDEX


The  following  documents  are filed  herewith  or  incorporated  herein by
reference.

Exhibit
  No.                      Description
- ------                     -----------
4.1               Restated  Certificate  of  Incorporation  of the  Company,  as
                  amended, is hereby incorporated herein by reference to Exhibit
                  3.1 to the Company's  Form 10-Q for the quarter ended June 30,
                  1997.

4.2               Bylaws  of  the  Company  is  hereby  incorporated  herein  by
                  reference  to Exhibit 3.2 to the  Company's  Form 10-K for the
                  year ended December 31, 1998.

4.3               Aerial Communications, Inc. Tax-Deferred Savings Plan.

4.4               Aerial Communications, Inc. Tax-Deferred Savings Trust.

5                 Opinion   of   Counsel   (previously   filed   with   original
                  registration statement).

23.1              Consent of Independent Public Accountants.

23.2              Consent of Counsel (contained in Exhibit 5).

24                Powers of Attorney (included on signature page).






<PAGE>


                                                                     EXHIBIT 4.3






                            Tax-Deferred Savings Plan




<PAGE>












                         AERIAL OPERATING COMPANY, INC.

                            TAX-DEFERRED SAVINGS PLAN
                            -------------------------

                                 January 1, 2000






<PAGE>




                         AERIAL OPERATING COMPANY, INC.
                         ------------------------------
                            TAX-DEFERRED SAVINGS PLAN
                            -------------------------

                                                                            PAGE
                                                                            ----

ARTICLE 1.        ESTABLISHMENT AND FIDUCIARIES................................4
         1.1      Establishment of Plan and Trust..............................4
         1.2      Appointment of Fiduciaries of Plan...........................4
         1.3      Delegation of Fiduciary Responsibility.......................4

ARTICLE 2.        DEFINITIONS..................................................5

ARTICLE 3.        PARTICIPATION AND SERVICE CREDIT............................12
         3.1      Participation...............................................12
         3.2      Year of Vesting Service.....................................14
         3.3      Employment By the Company and an Affiliate or Related
                    Entity....................................................14
         3.4      Vesting Service Under the TDS Plan, Amended Plans and
                    Plans Previously
                  Maintained by an Employer...................................15
         3.5      Leased Employees............................................15
         3.6      Reemployment of Veterans....................................16

ARTICLE 4.        CONTRIBUTIONS AND VALUATION.................................17
         4.1      Company Contributions.......................................17
         4.2      Salary Reduction Contributions..............................18
         4.3      Matching Employer Contributions.............................20
         4.4      Coordination Between Sections 4.2 and 4.3...................21
         4.5      Refund of Excess Contributions..............................22
         4.6      Voluntary Employee Contributions............................24

ARTICLE 5.        COMPUTATION OF BENEFITS.....................................24
         5.1      Maintenance of Accounts.....................................24
         5.2      Allocation of Plan Expenses.................................24
         5.3      Allocation of Trust Income..................................24
         5.4      Allocation of Salary Reduction Contributions................24
         5.5      Allocation of Employer Contributions, Forfeitures
                    and Matching Employer Contributions.......................25
         5.6      Priority of Allocations.....................................25
         5.7      Limitation on Allocations...................................26
         5.8      Establishment of Designated Funds...........................27

                                       -i-

<PAGE>


                                                                            PAGE
                                                                            ----
         5.9      Employee Direction of Investments...........................28
         5.10     Fund Allocations............................................29
         5.11     Duration of Investment Election.............................29

ARTICLE 6.        PAYMENT OF BENEFITS.........................................29
         6.1      Retirement..................................................29
         6.2      Disability..................................................29
         6.3      Death.......................................................30
         6.4      Other Termination of Service................................30
         6.5      Payment of Benefits.........................................31
         6.6      Designation of Beneficiary..................................33
         6.7      Location of Employee or Beneficiary Unknown.................34
         6.8      Distribution After Age 59-1/2...............................35
         6.9      Hardship Withdrawal.........................................34
         6.10     Plan Loans..................................................36

ARTICLE 7.        TRANSFER OF BENEFITS........................................37
         7.1      Transfer of Benefits........................................37
         7.2      Acceptance of Transferred Benefits..........................37

ARTICLE 8.        ADMINISTRATION OF THE PLAN..................................37
         8.1      Plan Administrator..........................................37
         8.2      Claim for Benefits..........................................38

ARTICLE 9.        ADMINISTRATION OF THE TRUST.................................39

ARTICLE 10.       AMENDMENT OR TERMINATION OF THE PLAN AND ADOPTION OF
         THE PLAN BY OTHER EMPLOYERS..........................................40
         10.1     Right to Amend or Terminate.................................40
         10.2     Effect of Termination.......................................40
         10.3     Adoption of the Plan by Affiliate or Related Entity.........40
         10.4     Adoption of the Plan by Successor...........................41

ARTICLE 11.       GENERAL PROVISIONS..........................................41
         11.1     Merger or Consolidation with Another Plan...................41
         11.2     Nonreversion................................................41
         11.3     Nonalienation...............................................42
         11.4     Facility of Payment.........................................43
         11.5     Indemnification.............................................43
         11.6     Limitation of Rights........................................43

                                      -ii-

<PAGE>


                                                                            PAGE
                                                                            ----
         11.7     Employment Non-Contractual..................................43
         11.8     Governing Laws..............................................43

ARTICLE 12.       TOP-HEAVY PROVISIONS........................................44
         12.1     Determination of Top-Heaviness..............................44
         12.2     Minimum Allocation..........................................45
         12.3     Minimum Vesting.............................................45
         12.4     Definitions.................................................45


                                      -iii-

<PAGE>



                         AERIAL OPERATING COMPANY, INC.
                         -----------------------------
                            TAX-DEFERRED SAVINGS PLAN
                            -------------------------

         ARTICLE 1.        ESTABLISHMENT AND FIDUCIARIES.

         1.1      Establishment of Plan and Trust.
                  -------------------------------
                  This Plan and the Trust are established as of January 1, 2000,
to provide, together with other retirement plans provided for eligible Employees
by the Company,  Social Security and personal savings,  for retirement  benefits
for  employees  participating  in the Plan. It is intended that the Plan and the
Trust qualify  under  Sections 401 and 501 of the Code,  respectively,  and that
contributions to the Trust be deductible under Section 404 of the Code.


         1.2      Appointment of Fiduciaries of Plan.
                  ----------------------------------
                  (a) The  Company  shall  be the  "Administrator"  and a "Named
Fiduciary"  of the Plan,  both  within the  meaning of ERISA.  The  Company  may
designate  in  writing,  if not  otherwise  specified  in the Plan,  a person or
persons to be responsible for carrying out its duties as  administrator or named
fiduciary.

                  (b) The Company hereby  designates  the Investment  Management
Committee (the "Committee"),  consisting of two or more individuals appointed by
the Board of Directors of the Company,  to be a "Named  Fiduciary"  of the Plan,
within the meaning of ERISA,  solely for purposes of directing  the Trustee with
respect  to the  investment  and  reinvestment  of the  assets of the  Plan,  in
accordance with the terms hereof.

                  (c)  The  decision  of  the  majority  of the  members  of the
Committee shall control in the event of any disagreement among the members.  Any
nonconcurring member of the Committee shall not be liable or responsible for any
action taken or failed to be taken over such member's  dissent if his dissent is
filed in writing  with the other  members or such  other  appropriate  action is
taken which is required under ERISA.

         1.3      Delegation of Fiduciary Responsibility.
                  --------------------------------------
                  (a) The members of the  Committee  may (i) allocate  fiduciary
responsibilities  between, or to, any one or more of them; (ii) designate others
to carry out such  responsibilities;  and (iii)  appoint one or more  investment
managers  (within  the  meaning  of  Section  3(38) of  ERISA)  and  remove  any
investment manager so appointed.


                                       -4-

<PAGE>



                  (b) The  Company  and the  Committee  mutually  represent  and
warrant,  each to the other, that any directions given or information  furnished
by them or their respective agents for purposes of the Plan or the Trust will be
given or furnished in accordance  with the terms hereof,  and in accordance with
the applicable provisions of the Code and ERISA.


         ARTICLE 2.        DEFINITIONS.

                  Wherever used in this document,  words in the masculine gender
shall include  masculine or feminine gender,  and, unless the context  otherwise
requires,  words in the singular shall include words in the plural, and words in
the plural shall include the singular. The words "hereof," "herein," "hereunder"
and other  similar  compounds  of the word  "here"  shall  mean and refer to the
entire document and not to any particular provisions. The titles and headings of
the provisions in this document are inserted merely for convenience of reference
and shall be given no legal effect.

        As  used  in  this  document,  unless  the  context  otherwise requires:

                  Account means the account  maintained for an Employee pursuant
to Section 5.1 hereof.  Employer  Account means the Account  maintained  for the
Employee pursuant to Section 5.1 hereof to which Employer  contributions,  other
than Matching Employer  Contributions,  made for such Employee under Section 4.1
hereof,  and amounts credited to such Employee's  employer account under the TDS
Plan, if any, that are transferred to the Plan, are credited.  Employer Matching
Account means the Account  maintained  for the Employee  pursuant to Section 5.1
hereof to which  Matching  Employer  Contributions  made for the Employee  under
Section 4.3 hereof,  and amounts credited to such Employee's  employer  matching
account  under the TDS  Plan,  if any,  that are  transferred  to the Plan,  are
credited.  Salary Reduction  Contributions  Account means the Account maintained
for the  Employee  pursuant  to  Section  5.1 hereof to which  Salary  Reduction
Contributions,  if any,  made for such Employee  under  Section 4.2 hereof,  and
amounts credited to such Employees salary reduction  contributions account under
the TDS Plan, if any, that are transferred to the Plan, are credited. Prior Plan
Account means the Account  maintained  for the Employee  pursuant to Section 5.1
hereof to which the Employee's account (other than the portion thereof,  if any,
attributable to after-tax employee contributions) under an Amended Plan, if any,
and amounts  credited to such Employee's  prior plan account under the TDS Plan,
if any, that are transferred to the Plan, are credited.  Rollover  Account means
the Account  maintained for the Employee pursuant to Section 5.1 hereof to which
the Employee's  benefit  transferred to the Plan under provisions of Section 7.2
hereof,  and amount credited to such Employee's  rollover  account under the TDS
Plan, if any, that are transferred to the Plan, are credited.

                  Aerial Common Shares means Common Shares,  par value $1.00 per
share, of Aerial Communications, Incorporated, a Delaware Corporation.

                                       -5-

<PAGE>



                  Affiliate means any trade or business entity which is a member
of a controlled  group with the Company (as described in Section  414(b) and (c)
of the Code, and modified by Section 415(h) of the Code, where applicable) or is
a member of an  affiliated  service  group with the  Company  (as  described  in
Section 414(m) of the Code) and any other entity  required to be aggregated with
the Company pursuant to final regulations under Section 414(o) of the Code.

                  Amended Plan means an employee  pension  benefit  plan,  which
contains a cash or deferred arrangement under Section 401(k) of the Code, any of
whose assets were transferred to the Plan (other than in accordance with Section
7.2 hereof) at or at any time after the Company's acquisition of stock or assets
of a company maintaining or contributing to such plan. In no event shall the TDS
Plan be considered for any purpose of the Plan to be an Amended Plan.

                  Annual  Addition  means,  with  respect to any Plan  Year,  an
amount  equal  to the sum of (a),  (b),  (c) and  (d)  below,  allocated  to any
Employee's Account, where:

                  (a) equals that  portion of the Employer  contributions  under
Sections 4.1, 4.3 and 12.2 hereof allocated to such Account,  including any such
contributions  that are forfeited  by, or returned to, the Employee  pursuant to
Section 4.5(b) hereof;

                  (b) equals the sum of all Salary Reduction  Contributions made
by the  Employee,  including  any such  contributions  that are  returned to the
Employee pursuant to Section 4.5(a) hereof;

                  (c) equals all of the Employee's voluntary contributions, if
any; and

                  (d) equals that portion of any  forfeitures  allocated to such
Account.

                  Annual Valuation Date means December 31 of each Plan Year.

                  Before-Tax  Contributions means before-tax  contributions made
under Section 401(k) of the Code to an Amended Plan.

                  Beneficiary  means the person or persons  entitled  to receive
benefits under the Plan payable upon an Employee's death.

                  Benefits  Department means the employee benefits department of
the Company, located at 8410 West Bryn Mawr, Chicago, Illinois 60631.

                  Code means the Internal  Revenue Code of 1986, as amended from
time to time.

                  Company  means  AERIAL  OPERATING  COMPANY,  INC.,  a Delaware
corporation, and any successor thereto that adopts the Plan.

                                       -6-

<PAGE>



                  Compensation  means the compensation  paid as remuneration for
services  by an  Employee  as defined  in each  article  herein  where such term
appears. Notwithstanding the foregoing,  Compensation in excess of the limit set
forth in Section  401(a)(17)  of the Code  (adjusted  for changes in the cost of
living pursuant to Section  401(a)(17) of the Code) shall be disregarded for all
purposes under the Plan.

                  Designated  Fund  means an  investment  fund  selected  by the
Committee to which  Employees may, in accordance  with Article 5 hereof,  direct
the investment of all or some portion of their Accounts.

                  Effective Date means January 1, 2000.

                  Employee  means any person who is employed by the Company,  an
Affiliate or a Related Entity,  and any former Employee who may be entitled to a
retirement benefit from the Plan by reason of his participation herein. The term
shall  not  include  any  Leased  Employee  or any  person  excluded  by name or
classification by the Company, an Affiliate or a Related Entity upon adoption of
the Plan.  The term shall also not  include any person  covered by a  collective
bargaining  agreement  that does not by its terms  provide  that such  person is
eligible  to  participate  in the Plan.  In the  event,  however,  that  persons
otherwise eligible to participate in the Plan select a bargaining representative
subsequent to the Effective Date then such persons shall continue to be eligible
to participate  pending the completion of  negotiations  between the Company and
such  persons'   selected   bargaining   representative.   Upon   completion  of
negotiations,   if  the  resulting  collective  bargaining  agreement  does  not
expressly  provide for  continued  eligibility  then such  persons  shall become
ineligible to  participate  further in the Plan as of the effective date of such
collective bargaining agreement.

                  Employer  means the Company,  any Affiliate or Related  Entity
that adopts the Plan pursuant to the  provisions of Section 10.3 hereof with the
Company's consent to such adoption.

                  Employment  Commencement  Date  means  the  date on  which  an
Employee (i) first performs an Hour of Service for the Company, an Affiliate, or
a Related  Entity or (ii)  first  performs  an hour of  service  (determined  in
accordance  with  Department of Labor  Regulation  Section  2530.200b-2)  with a
company any of the stock or assets of which are directly or indirectly  acquired
by the  Company.  Notwithstanding  the  preceding  sentence,  in the  case of an
Employee  who,  at any time during the period  beginning  on January 1, 1995 and
ending  on the date that the  Company  is no longer  an  Affiliate  of TDS,  was
employed  by TDS,  a TDS  Affiliate  or a TDS  Related  Entity,  the  Employment
Commencement  Date for such an Employee  shall be the later to occur of (i) date
on  which  the  Employee  first  performed  an hour of  service  (determined  in
accordance with Department of Labor Regulations Section 2530-200b-2) with TDS, a
TDS Affiliate or a TDS Related Entity or (ii) January 1, 1995.


                                       -7-

<PAGE>



                  ERISA means the  Employee  Retirement  Income  Security Act of
1974, as amended.

                  Entry Date means the first day of each calendar month.

                  401(k) Deferral  Percentage means that percentage,  rounded to
the  nearest  one-hundredth  of one  percent,  that is equal to the ratio of the
Employee's  Salary Reduction  Contributions  for the Plan Year to the Employee's
Compensation. In any Plan Year, the Company at its discretion may determine each
Employee's  401(k)  Deferral  Percentage  by  adding to such  Employee's  Salary
Reduction  Contributions either (i) Matching Employer Contributions allocated to
such Employee's Account that are distributable no earlier than the occurrence of
the  circumstances  described  in  Section  401(k)(2)(B)  of the  Code  and  are
nonforfeitable  within the meaning of Section  401(k)(2)(C)  of the Code or (ii)
Employer contributions  allocated to such Employee's Account that are "qualified
nonelective  contributions"  (within the meaning of Section  401(m)(4)(C) of the
Code)  which  are   distributable   no  earlier  than  the   occurrence  of  the
circumstances   described   in  Section   401(k)(2)(B)   of  the  Code  and  are
nonforfeitable  within the meaning of Section  401(k)(2)(C)  of the Code or both
(i) and (ii). For purposes of this definition,  Compensation  means compensation
that is includable in gross income (or would be includable  but for Section 125,
402(a)(8) or 402(h) of the Code) and is actually paid to the Employee during the
portion of the  12-month  period  ending on the last day of the Plan Year during
which the  Employee was eligible to  participate  in the Plan under  Section 3.1
hereof (disregarding any prohibition imposed by Section 6.9(d)(i) hereof).

                  401(m) Contribution Percentage means that percentage,  rounded
to the nearest  one-hundredth of one percent,  that is equal to the ratio of the
Matching  Employer  Contributions  made  on  behalf  of  the  Employee  and  the
Employee's voluntary contributions,  if any, for the Plan Year to the Employee's
Compensation. In any Plan Year, the Company at its discretion may determine each
Employee's 401(m) Contribution  Percentage by adding to such Employee's Matching
Employer  Contributions  all or a portion of the Salary Reduction  Contributions
allocated  to such  Employee's  Account  as of the  end of the  Plan  Year.  For
purposes of this definition,  Compensation means compensation that is includable
in gross income (or would be includable but for Section 125, 402(a)(8) or 402(h)
of the Code) and is  actually  paid to the  Employee  during the  portion of the
12-month  period  ending  on the last  day of the Plan  Year  during  which  the
Employee  was  eligible  to  participate  in the Plan under  Section  3.1 hereof
(disregarding any prohibition imposed by Section 6.9(d)(i) hereof).

                  Highly  Compensated  Employee  means an Employee  described in
Section 414(q) of the Code.

                  Leased  Employee means any person who renders  services to the
Company or any Affiliate or Related Entity as a leased employee and is described
in Section 414(n) of the Code.


                                       -8-

<PAGE>



                  Matching Employer  Contribution means the amounts  contributed
for an Employee by his Employer under Section 4.3 hereof.

                  Military Service.  Service in the "uniformed  services" within
the meaning of the Uniform Services  Employment and  Reemployment  Rights Act of
1994, which entitles a person rendering such service to reemployment  under such
Act provided such person returns to the employ of the Employer within the period
prescribed by such Act.

                  Normal  Retirement  Date means the date on which the  Employee
attains age 65.

                  Plan means the tax-deferred  savings plan herein set forth and
any amendment or supplement thereto.

                  Plan Year means the twelve month period beginning on January 1
and ending on the immediately  following  December 31. The first Plan Year shall
commence January 1, 2000.

                  Related  Entity  means any other trade or  business  entity in
which the Company or an Affiliate has an interest and that is a "subsidiary"  of
the Company as defined in Regulation C, Rule 405,  promulgated by the Securities
and Exchange Commission under the Securities Act of 1933.

                  Retirement  means any termination of Service after an Employee
is eligible for early or normal  retirement  benefits under any other  qualified
retirement plan  maintained by the Company,  an Affiliate or Related Entity with
which the Employee is in Service at the time of such termination,  or if no such
Plan exists,  termination of Service after any of the following  dates:  (i) the
date on which the sum of the Employee's age and Years of Vesting  Service equals
75,  provided  that he has attained 55 years of age;  (ii) the date on which the
Employee has completed at least 30 Years of Vesting  Service;  or (iii) the date
which is the later of the Employee's 65th birthday and the fifth  anniversary of
the date on which the Employee commences participation in the Plan.

                  Salary Reduction Contribution means the amounts contributed on
behalf of an Employee by his Employer pursuant to the Employee's  election under
Section 4.2 hereof.

                  Service means  employment by the Company,  until terminated by
quit, discharge,  retirement,  disability, death or otherwise,  accounted for in
accordance  with  Paragraphs  (a) and (b) below.  Employment  by an Affiliate or
Related  Entity  shall be treated as  employment  by the Company for purposes of
computing Service hereunder.

                  (a) Hours of Service means the sum of all hours credited to an
Employee  under  subparagraphs  (i)  through  (iv)  below,  determined  from the
employment  records of the Company,  the Affiliates  and Related  Entities which
accurately reflect the actual hours of service

                                       -9-

<PAGE>



to which the Employee is entitled.  An Employee for whom  employment  records do
not  accurately  reflect the hours of service to which the  Employee is entitled
shall be credited with Hours of Service under an alternative method permitted by
applicable law.

                  (i) An Employee  shall be credited with an Hour of Service for
         each hour for which he is directly or  indirectly  paid, or entitled to
         payment  by the  Company,  an  Affiliate  or a Related  Entity  for the
         performance  of duties.  These hours shall be credited to the  Employee
         for the Plan Year in which such duties are performed.

                  (ii) An Employee shall be credited with an Hour of Service for
         each hour for which he is directly or  indirectly  paid, or entitled to
         payment by the Company,  an Affiliate or a Related  Entity for a period
         of time during which he performed  no duties  (irrespective  of whether
         the employment  relationship has terminated) due to vacation,  holiday,
         illness,  incapacity (including  disability),  severance,  layoff, jury
         duty,  Military  Service  or leave of  absence.  These  hours  shall be
         credited to the  Employee  for the Plan Year during  which such absence
         occurs.

                  (iii) An Employee  shall be  credited  with an Hour of Service
         for each  hour for  which  back  pay,  irrespective  of  mitigation  of
         damages,  has been  either  awarded  or  agreed to by the  Company,  an
         Affiliate  or a Related  Entity.  These  hours shall be credited to the
         Employee  for the Plan Year to which such award or  agreement  pertains
         rather than the year in which the award, agreement or payment is made.

                  (iv) Hours of Service  shall be credited to an Employee on the
         basis of the actual  hours for which he is paid or entitled to payment,
         and no Employee  shall be  credited  with Hours of Service for the same
         hours   under   more   than   one  of  the   preceding   subparagraphs.
         Notwithstanding  subparagraphs (i) through (iii) above, (A) no Employee
         shall  be  credited   with  more  than  501  Hours  of  Service   under
         subparagraph  (ii) above on account  of any  single  continuous  period
         during  which he performs no duties,  (B) no Hours of Service  shall be
         credited to an  Employee  under  subparagraph  (ii) above to the extent
         payment for any period of time during which no duties are  performed is
         made or due  under a  program  maintained  solely  for the  purpose  of
         complying  with any  applicable  worker's  compensation  or  disability
         insurance  laws,  and (c) Hours of Service  shall not be credited  with
         respect to any payment which solely  reimburses an Employee for medical
         or medically-related expenses incurred by him.

                  (v) All Hours of Service  shall be credited and  determined in
         accordance with Department of Labor Regulation  Section  2530.200b-2(b)
         and (c).

                  (vi)  For  purposes  of this  definition,  Compensation  means
         compensation that is includible in gross income (or would be includible
         in gross income but for Section 125,

                                      -10-

<PAGE>



         402(a)(8)  or  402(h)(1)(B)  of the Code) and is  actually  paid to the
         Employee  during  the Plan Year for which such  determination  is being
         made.

                  (b) Break in Service  means any Plan Year (or, for purposes of
determining  eligibility to participate  in the Plan,  any  eligibility  period)
during  which an  Employee is not  credited  with more than 500 Hours of Service
under the Plan.  Solely for  purposes of  determining  whether an  Employee  has
incurred a Break in  Service,  such  Employee  shall,  in  addition  to Hours of
Service  credited under  Paragraph (a) above,  be credited with Hours of Service
based upon his customary  period of work, for periods of absence during which no
duties are  performed  and for which the  Employee  is not paid or  entitled  to
payment by the Company,  an  Affiliate  or a Related  Entity due to (i) Military
Service,  provided such Employee returns to work within the period and under the
conditions  provided  by law  for  the  protection  of his  reemployment  rights
following such service,  (ii) temporary layoff or leave of absence both of which
must be approved in advance by the Company,  an  Affiliate or a Related  Entity,
provided  such  Employee  returns to work on the date fixed by the  Company,  an
Affiliate or a Related Entity,  and (iii) leave of absence due to the Employee's
pregnancy, birth of the Employee's child, placement of a child with the Employee
in  connection  with the adoption of such child,  or caring for such child for a
period  immediately  following  such birth or  placement.  For purposes of (iii)
above,  Hours of Service shall be credited for the Plan Year in which such leave
of absence begins, if credit is necessary to prevent the Employee from incurring
a Break in  Service;  otherwise,  Hours of  Service  shall  be  credited  in the
immediately  following  Plan Year.  Not more than 501 Hours of Service  shall be
credited under (iii) above.

                  TDS  means   Telephone  and  Data   Systems,   Inc.,  an  Iowa
corporation.

                  TDS  Affiliate  means any trade or business  entity which is a
member of a controlled group with TDS (as described in Section 414(b) and (c) of
the Code, and modified by Section 415(h) of the Code,  where  applicable) or any
member of an affiliated  service group with TDS (as described in Section  414(m)
of the Code) and any other entity required to be aggregated with TDS pursuant to
final regulations under Section 414(o) of the Code.

                  TDS Common  Shares  means Common  Shares,  par value $1.00 per
share, of Telephone and Data Systems, Inc., an Iowa Corporation.

                  TDS Plan means the Telephone and Data Systems, Inc. Tax
Deferred Savings Plan.

                  TDS Related Entity means any other trade or business entity in
which TDS or a TDS Affiliate has an interest and that is a  "subsidiary"  of the
Company as defined in Regulation C, Rule 405,  promulgated by the Securities and
Exchange Commission under he Securities Act of 1933.


                                      -11-

<PAGE>



                  Total and Permanent Disability means a disability  (determined
by the Company's disability insurer) which has rendered the Employee totally and
permanently  disabled  within the meaning of the Company's long term  disability
plan.

                  Trust means the Trust created by agreement between the Company
and the Trustee, as from time to time amended.

                  Trust Fund means all money and  property of every kind held by
the Trustee under the Trust agreement.

                  Trustee  means the  trustee  provided  for in  Article  9, any
successor or, if there shall be more than one trustee acting at any time, all of
such trustees.

                  USCC Common  Shares means Common  Shares,  par value $1.00 per
share, of United States Cellular Corporation, a Delaware Corporation.

                  Valuation Date means each business day.


         ARTICLE 3.        PARTICIPATION AND SERVICE CREDIT.

         3.1      Participation.
                  -------------
                  (a)(i) Each  Employee of an Employer who is  participating  in
         the TDS Plan on the day before the Effective Date shall  participate in
         the  Plan  from and  after  the  Effective  Date,  provided,  he is and
         continues  to be employed  by an  Employer  on and after the  Effective
         Date.

                  (ii) In the case of an individual who is not  participating in
         the TDS Plan on the day before the  Effective  Date but who  becomes an
         Employee  because  either  (i) the  individual's  employer  becomes  an
         Affiliate,  or (ii) any of the  stock  or  assets  of the  individual's
         employer  is  directly  or  indirectly  acquired  by the  Company,  the
         Employee  shall  become  a  participant  in the  Plan  as of  the  date
         specified in the agreement  under which either the Employee's  employer
         became an Affiliate or the stock or assets of the  Employee's  employer
         was directly or indirectly  acquired by the Company,  provided that the
         Employee  satisfies the requirements of subsection (b) below as of such
         date (taking into account hours of service  described in Section 3.3(a)
         hereof) and provided the employer  becomes an Employer  under the Plan.
         If no date is specified in such  agreement or if the Employee  does not
         satisfy  the  requirements  of  subsection  (b)  below  as of the  date
         specified in such agreement,  the Employee shall commence participation
         in the Plan in  accordance  with  subsection  (b)  below  (taking  into
         account hours of service described in Section 3.3(a) hereof).

                                      -12-

<PAGE>



                  (b) Each other Employee shall  commence  participation  in the
Plan as of the first Entry Date  coinciding  with or  immediately  following the
date on which he satisfies the following requirements:

                  (i)      he is employed by an Employer;

             (ii) he attains age 21; and

            (iii) he completes three consecutive months of employment  beginning
         on his Employment Commencement Date, or any later reemployment date, or
         completes an eligibility  period during which he is credited with 1,000
         Hours of Service.  If an Employee does not complete  three  consecutive
         months of employment beginning on his Employment Commencement Date, his
         first  eligibility  period,  during  which he shall be  required  to be
         credited  with  1,000  Hours of  Service,  shall be the  12-consecutive
         calendar month period beginning on his Employment Commencement Date. If
         an  Employee  both  does  not  complete  three  consecutive  months  of
         employment  beginning on his  Employment  Commencement  Date and is not
         credited  with  1,000  Hours of Service  during  his first  eligibility
         period,  the Employee's  subsequent  eligibility  periods shall be each
         Plan  Year,  beginning  with the Plan  Year  that  includes  the  first
         anniversary of the Employee's Employment Commencement Date.

                  (c) If the Service of a non-participating  Employee terminates
after he had satisfied the requirement set forth in subsection (b)(iii) above or
if an Employee who was employed by TDS, a TDS Affiliate or a TDS Related  Entity
during the period  beginning  on January 1, 1995 and ending on the date that the
Company is no longer an Affiliate of TDS and who had satisfied  the  requirement
of subsection (b)(iii) above during such period, terminated employment with TDS,
such  TDS  Affiliate  or  TDS  Related  Entity,   in  the  event  of  his  later
reemployment,  he shall not be required to satisfy  again such  requirement  and
shall commence participation in the Plan on the last to occur of (i) the date of
his  reemployment,  (ii) the first Entry Date  following  his 21st  birthday and
(iii) the date that  would  have  been his Entry  Date if he had not  terminated
Service;  provided,  however,  that if such Employee had after such  termination
incurred at least five consecutive  Breaks in Service,  he shall be considered a
new Employee.

                  (d) If the Service of an Employee who participates in the Plan
terminates or if an Employee who participated in the TDS Plan at any time during
the  period  beginning  on  January  1, 1995 and  ending on the  Effective  Date
terminated  employment with TDS, a TDS Affiliate or a TDS Related Entity, in the
event  of  his  later   reemployment  by  the  Company,   he  shall   recommence
participation in the Plan as of the date of his reemployment by an Employer.

                  (e) No Leased Employee shall be eligible to participate in the
Plan.


                                      -13-

<PAGE>



         3.2      Year of Vesting Service.
                  -----------------------
                  (a) Each  Employee  shall be  credited  with a Year of Vesting
Service for each Plan Year in which he is credited with 1,000 Hours of Service.

                  (b) If the Service of an Employee terminates,  in the event of
his later  reemployment,  Years of Vesting Service  credited prior to a Break in
Service  shall be  disregarded  for  purposes  of  determining  Years of Vesting
Service  credited  after  such  Break in  Service  if (i) the  Employee  was not
entitled to any  nonforfeitable  percentage of his Account derived from Employer
contributions  prior  to the  Break in  Service,  and  (ii)  the  number  of his
consecutive Breaks in Service equals the greater of 5 or the total number of his
Years of Vesting Service credited prior to such Break in Service.

                  (c) If the Service of an Employee terminates,  in the event of
his later  reemployment,  Years of Vesting Service  credited after 5 consecutive
Breaks in Service  shall be  disregarded  for purposes of  determining  Years of
Vesting Service to be credited before such 5 consecutive Breaks in Service.

                  (d) If the Service of an Employee terminates,  in the event of
his later  reemployment,  Years of  Vesting  Service  with  respect to which the
Employee  has  received  a  distribution  of the  nonforfeitable  balance in his
Account as a result of his  termination of Service shall be  disregarded  unless
the Employee returns to Service and repays the full amount of such  distribution
to the Plan on or before the earlier of (i) the Annual  Valuation  Date on which
the Employee incurs 5 consecutive Breaks in Service following such distribution,
or (ii) the end of the 5-year period  beginning on the date the Employee returns
to Service.

         3.3      Employment By the Company and an Affiliate or Related Entity.
                  ------------------------------------------------------------
                  (a) For purposes of determining  participation  hereunder,  an
Employee shall be credited with Hours of Service (i) with respect to all Service
with the Company, any Affiliate and any Related Entity and (ii) for all hours of
service  (determined in accordance with Department of Labor  Regulation  Section
2530.200b-2)  with any company any of the stock or assets of which are  directly
or indirectly acquired by the Company.  In addition,  in the case of an Employee
who, during the period  beginning on January 1, 1995 and ending on the date that
the  Company  is no longer an  Affiliate  of TDS,  was  employed  by TDS,  a TDS
Affiliate or a TDS Related  Entity,  for purposes of  determining  participation
hereunder, such Employee shall be credited with all hours of service (determined
in accordance with Department of Labor Regulation Section 2530-200b- 2) credited
during such period with TDS, a TDS Affiliate or a TDS Related Entity.

                  (b) For  purposes  of  determining  Years of  Vesting  Service
hereunder,  an Employee  shall be credited with Hours of Service with respect to
all Service with the Company

                                      -14-

<PAGE>



and any  Affiliate  or Related  Entity (but only after the  Affiliate or Related
Entity became an Affiliate or Related Entity, as the case may be).

                  (c) For purposes of  subsection  (a) and (b) above and Article
6, if an Employee transfers  employment among the Company,  any Affiliate or any
Related Entity, such Employee shall not be deemed to have terminated Service.

3.4  Vesting  Service  Under the TDS Plan,  Amended  Plans and Plans  Previously
     ---------------------------------------------------------------------------
     Maintained by an Employer.
     -------------------------
                  (a) In  addition to the Years of Vesting  Service  credited to
any  Employee  under the  preceding  provisions  of this  Article 3, an Employee
shall, upon the first Entry Date on which an Employee commences participation in
the Plan under  Section 3.1 hereof,  be credited  with Years of Vesting  Service
equal to the excess of (i) vesting  service  credited to the Employee  under any
predecessor plan (defined in subsection (b) below) or any Amended Plan over (ii)
the Years of  Vesting  Service  credited  to the  Employee  under the  preceding
provisions of this Article 3. In addition to Years of Vesting  Service  credited
pursuant to the preceding sentence, an Employee who, during the period beginning
on  January  1, 1995 and  ending on the date  that the  Company  is no longer an
Affiliate of TDS, was employed by TDS, a TDS  Affiliate or a TDS Related  Entity
shall be  credited  with  Years of  Vesting  Service  equal to the excess of (i)
vesting service  credited during such period to such Employee under the TDS Plan
over  (ii) the Years of  Vesting  Service  credited  to the  Employee  under the
preceding  provisions  of this  Article 3.  Notwithstanding  the  preceding  two
sentences,  in the case of an Employee who participated in a predecessor plan or
the TDS Plan and who incurred  five or more  consecutive  break in service years
(as defined in Section 411(a)(6) of the Code), no Years of Vesting Service shall
be credited to an Employee under this Plan for vesting  service  credited to the
Employee under such  predecessor plan or the TDS Plan if (i) the Employee had no
vested right to employer  contributions  under such  predecessor plan or the TDS
Plan or (ii) the  number of his  consecutive  break in service  years  equals or
exceeds the  greater of five and the number of years of service  credited to the
Employee under the predecessor plan or the TDS Plan.

                  (b) For purposes of this Section 3.4, a predecessor plan means
a plan,  other than an Amended Plan or the TDS Plan,  that was  qualified  under
Section  401(a) of the Code and whose  related  trust was  exempt  from  federal
income  tax  under  Section  501(a)  of the Code and that was  maintained  by or
required to be  contributed  to by a company any of the stock or assets of which
are directly or  indirectly  acquired by the Company or an  Affiliate,  provided
that (i) as a result of such acquisition,  any employee who participated in such
plan begins participating in the Plan and (ii) accurate information to calculate
an Employee's vesting service under such plan is made available to the Company.

3.5 Leased  Employees.  If an  individual  who  performed  services  as a Leased
    -----------------
Employee becomes an Employee, or if an Employee becomes a Leased Employee,  then
any
                                      -15-

<PAGE>



period during which such services were so performed  shall be taken into account
solely for the  purposes of (i)  determining  whether  and when such  individual
satisfied  the  eligibility  service  requirement  set forth in  Section  3.1(b)
hereof,  (ii)  determining the  individual's  Years of Vesting Service and (iii)
determining  when such  individual has terminated his employment for purposes of
Article  6 hereof,  to the same  extent  it would  have been had such  period of
employment  been as an Employee.  This Section 3.5 shall not apply to any period
of service  during which such a Leased  Employee was covered by a plan described
in Section 414(n)(5) of the Code.

3.6 Reemployment of Veterans.  The provisions of this Section 3.6 shall apply in
    ------------------------
the case of the  reemployment  by an Employer of an Employee,  within the period
prescribed  by laws  relating to the rights of  reemployed  veterans,  after the
Employee's  completion of a period of qualified  military service (as defined in
Section  414(u)(5) of the Code). The provisions of this Section 3.6 are intended
to provide  such  Employees  with the rights  required by Section  414(u) of the
Code, and shall be interpreted in accordance with such intent.

                  An Employee  participating  in the Plan after  completion of a
period of qualified  military  service  shall be credited with a Year of Vesting
Service for any Plan Year during  which he is in qualified  military  service if
the Employee would have completed  1,000 Hours of Service in such Plan Year, but
for the qualified  military service (based on the Employee's work schedule as in
effect on the date such military  service began,  as determined by the Company).
In  addition,  such  Employee  shall  be  permitted  to make  additional  salary
reduction contributions and shall be entitled to matching Employer contributions
with respect to any such additional salary reduction contributions in accordance
with the following subsections:

                  (a) Such Employee  shall be entitled to have his Employer make
salary reduction contributions under the Plan ("Make Up Deferrals"), in addition
to any Salary  Reduction  Contributions  which the Employee  elects to have made
under Section  4.2(a)  hereof.  From time to time while employed by an Employer,
such Employee may elect to have his Employer  contribute  such Make Up Deferrals
during the period  beginning  on the date of such  Employee's  reemployment  and
ending on the earlier of:

                  (i)    the end of the period equal to the product of three
               and such Employee's period of qualified military service, and

                  (ii)   the fifth anniversary of the date of such reemployment.

Such  Employee  shall not be permitted to elect to have his Employer  contribute
Make Up  Deferrals  to the Plan in an amount in excess of the  amount  which the
Employee  could have elected to have made under Section  4.2(a) hereof as Salary
Reduction  Contributions  if the Employee had continued in  employment  with his
Employer during such period of qualified  military service.  The manner in which
an Employee may elect to have his Employer contribute Make Up Deferrals pursuant
to this subsection (a) shall be prescribed by the Company.

                                      -16-

<PAGE>



                  (b) An  Employee  who elects to have his  Employer  contribute
Make Up Deferrals as described in  subsection  (a) above shall be entitled to an
allocation of matching Employer contributions ("Make Up Matching Contributions")
in an amount equal to the amount of Matching Employer  Contributions  that would
have been allocated to the Employer  Matching Account of such Employee under the
Plan if such  Make  Up  Deferrals  had  been  made  during  the  period  of such
Employee's  qualified military service (as determined pursuant to Section 414(u)
of the Code). The amounts  necessary to make such allocation of Make Up Matching
Contributions  shall be  derived  from any  forfeitures  that  remain  after the
application of Section 5.5(b) hereof or, if such  forfeitures  are less than the
amount  of  Make  Up  Matching  Contributions  that  must  be  allocated  to any
Employee's Employer Matching Account,  then the Employee's Employer shall make a
special  contribution  which  shall be  utilized  solely  for  purposes  of such
allocation.

                  (c) An  Employee's  "Compensation,"  as  defined  in  Sections
4.2(a) and 4.3(a) hereof,  during any period of qualified military service shall
be determined in accordance with Section 414(u) of the Code.

                  (d) Any contributions of Make Up Deferrals made by an Employer
on behalf of an Employee and any contributions of Make Up Matching Contributions
made by an Employer,  in either case, pursuant to this Section 3.6 on account of
a period of qualified  military service in a prior Plan Year and any allocations
of such  contributions  to an Employee  shall not be subject to the  limitations
prescribed  by  Sections  4.2(f)  and 5.7 hereof for the Plan Year in which such
contributions and allocations are made, but,  instead,  shall be subject to such
limits for the Plan Year to which such contributions and allocations  relate. In
addition,  such  contributions  shall not be included in computing an Employees'
401(k) Deferral Percentage or 401(m) Contribution Percentage for any Plan Year.

         ARTICLE 4.   CONTRIBUTIONS AND VALUATION.

         4.1      Company Contributions.
                  ---------------------
                  (a) Each  Employer  shall  contribute  to the Trustee for each
Plan Year,  such amount,  if any, as its Board of Directors  shall  determine by
appropriate resolution.

                  (b) Notwithstanding subsection (a) above to the contrary, each
Employer shall  contribute  during each Plan Year an amount that is necessary to
restore any Account of its Employees  pursuant to Section  6.4(e) hereof if such
Account is not restored pursuant to Section 5.5(a) hereof.

                  (c) All Employer contributions under this Section 4.1 shall be
in cash or in Aerial Common  Shares,  as  determined by the Employer  making the
contribution, and shall be made within the time prescribed by law for filing the
Employer's  federal income tax return,  including  extensions  thereof,  for the
taxable year that ends with the Plan Year. For purposes of

                                      -17-

<PAGE>



this Section 4.1,  Aerial Common Shares shall be valued at the closing price for
such shares on the Nasdaq  National  Market  ("Nasdaq")  on the last trading day
preceding the date of purchase.

         4.2      Salary Reduction Contributions.
                  ------------------------------
                  (a) Except as provided in  subsection  (f) below,  an Employee
who is eligible to  participate  in the Plan under Section 3.1 hereof may elect,
at the  time  and in the  manner  prescribed  by the  Company,  to make a Salary
Reduction Contribution in any whole percentage (or fraction thereof from time to
time  permitted  by the  Company)  of his  Compensation  up to a maximum  of 15%
thereof.  An election to make a Salary Reduction  Contribution may be made as of
the first date on which an Employee  becomes eligible to participate in the Plan
under Section 3.1 hereof.  If an Employee who is eligible to  participate in the
Plan  under  Section  3.1  hereof  fails  to  make  a  timely  Salary  Reduction
Contribution  election  as of the  first  date on  which  the  Employee  becomes
eligible, such Employee may make such election effective, as of the first day of
the next  payroll  period  administratively  practicable  after  the  Employee's
election  is  received  by  the  Company  or its  designee.  Each  Employee  who
authorizes a Salary Reduction Contribution shall have his total compensation for
such period  reduced by an equal amount.  For purposes of this  subsection  (a),
Compensation  means compensation that is includible in gross income (or would be
includible in gross income but for Section 125, 402(a)(8) or 402(h)(1)(B) of the
Code) and is actually  paid to the Employee  during the Plan Year  including all
commissions,  bonuses and overtime pay, but excluding reimbursement for business
expenses,  any  other  taxable  or  non-taxable  fringe  benefits  and any other
contributions  to this or any other  qualified plan of deferred  compensation of
the Company.

                  (b) Contributions  elected by an Employee under subsection (a)
above  shall  continue  until  such  time  as he  may  change  or  suspend  such
contributions by making a new election at the time and in the manner  prescribed
by the Company.  Any such change  shall become  effective as of the first day of
the next  payroll  period  administratively  practicable  after  the  Employee's
election is received by the Company or its designee.  Any such suspension  shall
become  effective  as soon as  practicable  after  receipt by the Company of the
Employee's  election  to  suspend  contributions.  An  Employee  who  changes or
suspends such contributions may not change or resume such contributions until as
of the first day of the next payroll period  administratively  practicable after
the Employee's election is received by the Company or its designee.

                  (c) All Salary Reduction  Contributions shall be provisionally
accepted and are subject to return to the Employee pursuant to the provisions of
Section 4.5 hereof.

                  (d) The amount of Salary  Reduction  Contributions  elected by
any Employee  under  subsection  (a) above may be reduced or suspended  during a
Plan Year by the Company if, in its sole  discretion,  it  determines  that such
reduction or suspension is necessary or desirable in

                                      -18-

<PAGE>



order that the  actual  deferral  percentage  for the  current  Plan Year of all
eligible Highly  Compensated  Employees  (determined as a group) does not exceed
the greater of:

                  (i) 125% of the actual deferral percentage for the immediately
         preceding  Plan Year of all other eligible  Employees  (determined as a
         group), or

             (ii) the lesser of 200% of the actual  deferral  percentage for the
         immediately  preceding  Plan  Year  of  all  other  eligible  Employees
         (determined as a group) and 2 percentage points in excess of the actual
         deferral  percentage  for the  immediately  preceding  Plan Year of all
         other eligible Employees (determined as a group).

For purposes of this subsection  (d), the actual deferral  percentage of a group
of eligible Employees shall be the average, rounded to the nearest one-hundredth
of one percent, of the 401(k) Deferral Percentages of Employees in the group for
the  Plan  Year.  In  computing  the  actual  deferral  percentage  of a  Highly
Compensated  Employee who  participates in this Plan and one or more other plans
of the Employer to which  contributions  described in Section 401(k) of the Code
are made,  this Plan and all such other  plans shall be treated as a single plan
(unless they may not be permissively  aggregated  under the Code) and all Salary
Reduction Contributions made on behalf of such Highly Compensated Employee under
this Plan and all contributions  described in Section 401(k) of the Code made on
behalf of such  Highly  Compensated  Employee  under such other  plans  shall be
aggregated for purposes of determining such Highly Compensated Employee's 401(k)
Deferral Percentage.

                  (e) As promptly as practicable, the aggregate amount of Salary
Reduction Contributions elected under this Section 4.2 and deducted from payroll
on behalf of each  Employee  shall be remitted to the  Trustee,  but in no event
later than 15  business  days after the last day of the month in which they were
otherwise payable to the Employers' Employees.

                  (f)  Notwithstanding  anything  herein  to  the  contrary,  no
Employee's Salary Reduction  Contribution  during any calendar year shall exceed
the amount  provided for in Section 402(g) of the Code,  adjusted for changes in
the cost of living under applicable rules and regulations ($10,500 for 2000). If
for any calendar year an Employee determines that the aggregate amount of Salary
Reduction   Contributions   and  amounts   contributed   under  other  plans  or
arrangements  maintained by the Company or an Affiliate and described in Section
401(k),  408(k)  or  403(b)  of the Code will  exceed  the  limitations  of this
subsection (f) for the calendar year in which such contributions were made, such
Employee shall,  pursuant to such rules and at such time following such calendar
year as determined by the Company,  be allowed to submit a written  request that
such  excess  contributions,  reduced  by  any  amounts  previously  distributed
pursuant to Section 4.5(a)  hereof,  plus any income  allocable  thereto for the
calendar year to which the  contributions  relate,  shall be distributed to him.
The amount of income to be distributed  pursuant to the preceding sentence shall
be determined in accordance with applicable rules and  regulations.  The request
described in this subsection (f) shall be made on a form

                                      -19-

<PAGE>



provided by the Company which specifies the Employee's  contributions  in excess
of the  limitations of this subsection (f) for the calendar year. A distribution
of such excess contributions,  plus income, shall be made no later than April 15
of the  calendar  year  following  the  calendar  year  for  which  such  excess
contributions were made.

         4.3      Matching Employer Contributions.
                  -------------------------------
                  (a) Each Employer  shall  contribute to the Trustee a Matching
Employer  Contribution  on behalf of each Employee  employed by such Employer on
the Annual Valuation Date (or, in the case of an Employee who terminated Service
during  the  Plan  Year  on  account  of his  Retirement,  Total  and  Permanent
Disability  or death,  on behalf of each such former  Employee  employed by such
Employer on the date of such termination of Service) who is participating in the
Plan equal to the sum of 100% of the first level,  and 25% of any second  level.
For purposes of this subsection (a), an Employee's  "Matchable  Salary Reduction
Contribution"  means  the  Salary  Reduction  Contributions  authorized  by  the
Employee that do not exceed a first level of 2%, and a second level in excess of
the first level of 4%. For purposes of this subsection (a),  Compensation  shall
have the same meaning as that term is defined in Section 4.2(a)  hereof,  except
that an Employee's  Compensation  shall only include  Compensation  paid to such
Employee  for the portion of the Plan Year during which the Employee is eligible
to participate in the Plan.

                  (b) All Matching Employer Contributions shall be provisionally
accepted and,  pursuant to the provisions of Section 4.5(b) hereof,  are subject
to forfeiture or distribution to Highly Compensated  Employees  participating in
the Plan.

                  (c) Matching Employer  contributions required under subsection
(a) above may be reduced or  suspended  during a Plan Year by the Company if, in
its sole  discretion,  it  determines  that  such  reduction  or  suspension  is
necessary or desirable in order that the actual contribution  percentage for the
current Plan Year of all eligible Highly Compensated  Employees (determined as a
group) does not exceed the greater of:

                  (i)  125%  of  the  actual  contribution  percentage  for  the
         immediately  preceding  Plan  Year  of  all  other  eligible  Employees
         (determined as a group), or

             (ii) the lesser of 200% of the actual  contribution  percentage for
         the  immediately  preceding Plan Year of all other  eligible  Employees
         (determined as a group) and 2 percentage points in excess of the actual
         contribution  percentage for the immediately preceding Plan Year of all
         other eligible Employees (determined as a group).

For purposes of this  subsection  (c),  the actual  contribution  percentage  on
behalf of a group of eligible  Employees  shall be the  average,  rounded to the
nearest  one-hundredth of one percent of the 401(m) Contribution  Percentages of
Employees in the group for the Plan Year. In computing

                                      -20-

<PAGE>



the  actual  contribution  percentage  of  a  Highly  Compensated  Employee  who
participates  in this Plan and one or more other plans of the  Employer to which
contributions  described in Section  401(m) of the Code are made,  this Plan and
all such other plans shall be treated as a single plan  (unless  they may not be
permissively  aggregated under the Code) and all Matching Employer Contributions
made on behalf  of such  Highly  Compensated  Employee  under  this Plan and all
contributions  described  in Section  401(m) of the Code made for,  or by,  such
Highly  Compensated  Employee  under such other  plans shall be  aggregated  for
purposes of determining such Highly Compensated  Employee's 401(m)  Contribution
Percentage.

                  (d)  Matching  Employer  Contributions  that  are  added to an
Employee's  Salary  Reduction  Contributions  for purposes of  determining  that
Employee's  401(k)  Deferral  Percentage  under  Section  4.2(d) hereof shall be
disregarded  for purposes of determining  that  Employee's  401(m)  Contribution
Percentage.

                  (e) All Matching  Employer  Contributions  made by an Employer
under this  Section  4.3 shall be made in cash and shall be made within the time
for filing of the  Employer's  federal income tax return,  including  extensions
thereof, for the taxable year that ends with the Plan Year.

         4.4      Coordination Between Sections 4.2 and 4.3.
                  -----------------------------------------
                  (a)   Notwithstanding  the  limitations  on  Salary  Reduction
Contributions  under  Section  4.2(d)  hereof and the  limitations  on  Matching
Employer  Contributions  under Section 4.3(c) hereof,  the Company,  in its sole
discretion,  may further reduce or suspend such  Contributions  if it determines
that such  reduction or  suspension  is necessary or desirable in order that the
sum of the actual deferral  percentage (as defined in Section 4.2(d) hereof) for
the current Plan Year on behalf of the  eligible  Highly  Compensated  Employees
(determined  as a group) and the actual  contribution  percentage (as defined in
Section  4.3(c)  hereof)  for the  current  Plan Year on behalf of the  eligible
Highly Compensated Employees (determined as a group) does not exceed the greater
of:

                  (i)  the  sum of (A)  125% of the  greater  of (1) the  actual
         deferral  percentage for the immediately  preceding Plan Year on behalf
         of  eligible  Employees  who  are  not  Highly  Compensated   Employees
         (determined as a group), and (2) the actual contribution percentage for
         the immediately preceding Plan Year on behalf of eligible Employees who
         are not Highly Compensated  Employees  (determined as a group), and (B)
         the  lesser of (1) the sum of two  percentage  points and the lesser of
         (A)(1)  and  (A)(2)  above,  and (2) 200% of the  lesser of (A)(1)  and
         (A)(2) above; and

             (ii) the sum of (A) 125% of the lesser of (i)(A)(1)  and  (i)(A)(2)
         above,  and (B) the lesser of (1) the sum of two percentage  points and
         the  greater  of  (i)(A)(1)  and  (i)(A)(2)  above  and (2) 200% of the
         greater of (i)(A)(1) and (i)(A)(2) above.

                                      -21-

<PAGE>



                  (b) For purposes of subsection  (a) above,  Matching  Employer
Contributions that are added to an Employee's Salary Reduction Contributions for
purposes of determining that Employee's 401(k) Deferral Percentage under Section
4.2(d) hereof shall be disregarded  for purposes of determining  that Employee's
401(m)  Contribution  Percentage.  In addition,  for purposes of subsection  (a)
above,  if "excess  contributions,"  as defined in Section  4.5(a)  hereof,  are
distributed under Section 4.5(c) hereof, the actual deferral  percentage will be
deemed to be the largest  amount  permitted  under Section  4.2(d) hereof and if
"excess  matching  contributions,"  as  defined in Section  4.5(b)  hereof,  are
forfeited or distributed  under Section 4.5(d) hereof,  the actual  contribution
percentage  will be deemed to be the  largest  amount  permitted  under  Section
4.3(c) hereof.

         4.5      Refund of Excess Contributions.
                  ------------------------------
                  (a) If for any Plan Year, the Salary  Reduction  Contributions
on behalf of the eligible Highly Compensated  Employees  (determined as a group)
exceed the  limitations  under Section 4.4 or 4.2(d)  hereof,  the Company shall
return so much or all of such excess  contribution  (defined below),  reduced by
any amounts  previously  distributed  pursuant to Section 4.2(f) hereof, and the
income attributable to such excess contributions (as reduced),  determined under
subsection (f) below, to the Highly Compensated  Employees  participating in the
Plan in the manner  described in subsection (c) below.  Upon the distribution of
any Salary  Reduction  Contributions  pursuant to the  preceding  sentence,  any
corresponding  Employer  Matching  Contributions  allocated  to  the  Employee's
Employer  Matching  Account,  adjusted for income or loss pursuant to applicable
rules and regulations,  shall be forfeited. For purposes of this subsection (a),
excess  contribution  means  the  excess of (i) the  aggregate  amount of Salary
Reduction  Contributions made on behalf of Highly Compensated  Employees for the
current Plan Year over (ii) the maximum amount of Salary Reduction Contributions
permitted under Section 4.2(d) hereof  (determined by reducing Salary  Reduction
Contributions made on behalf of Highly Compensated  Employees in order of 401(k)
Deferral Percentages, beginning with the highest 401(k) Deferral Percentage).

                  (b) If for any Plan Year the Matching Employer Contribution on
behalf of the eligible  Highly  Compensated  Employees  (determined  as a group)
exceeds the limitations  under Section 4.4 or Section 4.3(c) hereof (such excess
being  referred  to herein as an "excess  matching  contribution"),  such excess
matching  contribution  (defined  below),  to the  extent not  vested,  shall be
forfeited by, and, to the extent  vested,  shall be  distributed  to, the Highly
Compensated  Employees  participating  in the Plan in the  manner  described  in
subsection (d) below. If the Matching  Employer  Contribution is forfeited by or
distributed  to Highly  Compensated  Employees  participating  in the Plan,  the
income allocable to such excess,  determined  under subsection (f) below,  shall
also be  forfeited  or  distributed,  as the case may be. For  purposes  of this
subsection  (b),  excess  matching  contribution  means  the  excess  of (i) the
aggregate  amount of Matching  Employer  Contributions  made on behalf of Highly
Compensated  Employees for the current Plan Year over (ii) the maximum amount of
Matching Employer Contributions permitted

                                      -22-

<PAGE>



under  Section  4.3(c)  hereof   (determined  by  reducing   Matching   Employer
Contributions made on behalf of Highly Compensated  Employees in order of 401(m)
Contribution  Percentages,   beginning  with  the  highest  401(m)  Contribution
Percentage.

                  (c) The amount of Salary Reduction  Contributions that must be
returned  under  subsection (a) above shall be allocated pro rata to each Highly
Compensated   Employee   who  has  the  highest   amount  of  Salary   Reduction
Contributions  until the amount of Salary  Reduction  Contributions of each such
Highly  Compensated  Employee  does not exceed  the  amount of Salary  Reduction
Contributions of the Highly Compensated Employee with the next highest amount of
Salary Reduction Contributions.  Any Salary Reduction Contributions that must be
returned  which have not been  allocated  under the preceding  sentence shall be
successively allocated pro rata to the Highly Compensated Employees who have the
highest amount of Salary Reduction  Contributions in the manner described in the
preceding sentence until the entire amount of the Salary Reduction Contributions
that must be returned under subsection (a) above have been allocated.

                  (d) The amount of Matching Employer Contributions that must be
forfeited or returned under  subsection (b) above shall be allocated pro rata to
each Highly Compensated Employee who has the highest amount of Matching Employer
Contributions  until the amount of Matching Employer  Contributions of each such
Highly  Compensated  Employee  does not exceed the amount of  Matching  Employer
Contributions of the Highly Compensated Employee with the next highest amount of
Matching Employer  Contributions.  Any Matching Employer Contributions that must
be  forfeited  or returned  which have not been  allocated  under the  preceding
sentence  shall be  successively  allocated  pro rata to the Highly  Compensated
Employees who have the highest amount of Matching Employer  Contributions in the
manner  described  in the  preceding  sentence  until the  entire  amount of the
Matching  Employer  Contributions  that  must be  forfeited  or  returned  under
subsection (b) above have been allocated.

                  (e) Any Salary Reduction  Contributions  that must be returned
to Highly  Compensated  Employees  under  subsection  (a) above and any Matching
Employer  Contributions  that must be  forfeited  by,  or  returned  to,  Highly
Compensated  Employees under  subsection (a) or (b) above shall be forfeited by,
or distributed to, the Highly Compensated  Employees not later than the last day
of the Plan  Year  immediately  following  the Plan  Year in which  such  excess
contributions   arose.  If  such  excess  contributions  are  not  forfeited  or
distributed  within 2-1/2 months following the Annual Valuation Date of the Plan
Year in which  they  arose,  the  Employers  shall be  subject to the excise tax
imposed by Section 4979 of the Code.

                  (f) The  return  of  Salary  Reduction  Contributions  and the
return or forfeiture of any Matching Employer  Contributions  under this Section
4.5 shall be accompanied by the income allocable to such  contributions  for the
Plan Year to which the contributions  relate. The amount of such income shall be
determined in accordance with applicable rules and regulations.


                                      -23-

<PAGE>



         4.6     Voluntary  Employee  Contributions.  Employees  shall  not  be
                 -----------------------------------
required or permitted to make any non-Salary  Reduction Voluntary  Contributions
to the Plan.


         ARTICLE 5.     COMPUTATION OF BENEFITS.

         5.1 Maintenance of Accounts.  The Company shall maintain or cause to be
             -----------------------
maintained a separate Account for each Employee.  The Account  maintained for an
Employee shall consist of an Employer Account,  an Employer Matching Account,  a
Salary Reduction Contributions Account and, if any, a Prior Plan Account and, if
any, a Rollover  Account,  but the maintenance of these Accounts shall be solely
for accounting purposes and shall not require that the assets of each Account be
segregated.  The books of  accounts,  forms and  accounting  methods used in the
administration of Employees'  Accounts shall be the responsibility of, and shall
be subject to the supervision and control of, the Company.

         5.2  Allocation  of Plan  Expenses.  As of  each  Valuation  Date,  all
              -----------------------------
expenses  of  administering  the Plan,  including  the fees and  expenses of the
Trustee  shall,  at the discretion of the Company,  be paid by the Company,  the
Employers  or by the Trustee from the Trust Fund.  If such  expenses are paid by
the Trustee from the Trust Fund,  each Account  shall bear an equitable  portion
thereof,  in accordance with uniform procedures  established by the Company.  If
such expenses are paid by the Employers,  the Company,  in its sole  discretion,
having regard to the nature of a particular expense, shall determine the portion
of such expense which is to be borne by a particular Employer.

         5.3   Allocation of Trust Income.
               --------------------------
                  (a) As of each Valuation  Date, any income or loss of, and any
increase  or decrease in the fair  market  value of the Trust  assets  since the
preceding  Valuation  Date shall be credited to or deducted  from the Account of
each  Employee  who has an unpaid  balance in his  Account  as of the  preceding
Valuation   Date  (adjusted  in  a  uniform  and   non-discriminatory   way  for
contributions  and withdrawals  from such Account through the current  Valuation
Date) in the  ratio  that  each  such  Account  bears  to the  total of all such
Accounts.

                  (b) Notwithstanding subsection (a) above, as of each Valuation
Date, any increase or decrease in the fair market value of any  Designated  Fund
attributable to an Employee's  designated investment therein, and all income and
losses of such Designated  Fund since the preceding  Valuation shall be credited
to or deducted from the Account of such Employee.

         5.4      Allocation of Salary Reduction Contributions.  As of the next
                  --------------------------------------------
Valuation Date administratively practicable after the date they are made, any
Salary Reduction Contributions

                                      -24-

<PAGE>



made by an  Employee  shall be credited  to the Salary  Reduction  Contributions
Account of such Employee.

         5.5      Allocation of Employer Contributions, Forfeitures and Matching
                  --------------------------------------------------------------
Employer Contributions.
- ----------------------
                  (a) As of  each  Annual  Valuation  Date,  any  balance  in an
Employee's  Account that is forfeited  during the Plan Year pursuant to Sections
4.5(a),  4.5(b) and 6.4(d)  hereof  shall be used to restore  the Account of any
Employee who during such Plan Year  complies  with the  requirements  of Section
6.4(e) hereof.

                  (b) As of each Annual Valuation Date, the forfeitures, if any,
that remain after  application  of subsection  (a) above shall be used to reduce
the Employers' Matching Employer Contributions under Section 4.3 hereof.

                  (c) As of the next Valuation Date administratively practicable
after Matching  Employer  Contributions  are contributed by the Employers to the
Trustee, the Matching Employer Contributions for the Plan Year under Section 4.3
hereof shall be allocated  among the respective  Employer  Matching  Accounts of
Employees who made Matchable Salary  Reduction  Contributions to the Plan during
the Plan Year  under  Section  4.2 hereof  and who were  employed  on the Annual
Valuation Date by the Employer that made the Matching Employer Contributions (or
who  terminated  Service with such  Employer  during the Plan Year on account of
Retirement,  Total and Permanent  Disability or death). Each Employee's Matching
Employer Account shall be credited with an amount equal to the Matching Employer
Contribution made on his behalf.

                  (d)  As  of  each  Annual   Valuation   Date,   the   Employer
contribution  for the Plan Year under Section 4.1(a) hereof and the forfeitures,
if any, that remain after  application of subsections (b) and (c) above shall be
allocated  ratably among the respective  Employer  Accounts of each Employee who
(i) is  credited  with 1,000  Hours of Service for such Plan Year and (ii) is in
the  Service of an  Employer  on the  Annual  Valuation  Date or had  terminated
Service  during  the Plan Year on  account of  Retirement,  Total and  Permanent
Disability or death in the ratio that each such Employee's Compensation bears to
the total  Compensation of all Employees who are entitled to an allocation under
this subsection (d) for such Plan Year.

                  (e) For  purposes  of this  Section  5.5,  Compensation  means
compensation that is includible in gross income (or would be includible in gross
income  but for  Section  125,  402(a)(8)  or  402(b)(1)(B)  of the Code) and is
actually  paid to the  Employee  during  that part of the Plan Year in which the
Employee is participating in the Plan.

         5.6 Priority of Allocations. All allocations to the Accounts under this
             -----------------------
Article 5 shall be deemed to have been made on the related Annual Valuation Date
or other  Valuation  Date in the order of priority  set forth in this Article 5,
even though actually determined at a later date.

                                      -25-

<PAGE>



         5.7 Limitation on Allocations.  Notwithstanding  any other provision to
             -------------------------
the  contrary,  the  Annual  Addition  in any  Plan  Year  with  respect  to any
Employee's  Account and his accounts under all other defined  contribution plans
of the Employers shall not exceed the lesser of $30,000 (adjusted for changes in
the cost of  living  under  applicable  rules and  regulations)  and 25% of such
Employee's Compensation.  If the amount allocable to an Employee's Account would
exceed the limitation set forth in the immediately preceding sentence,  then the
amount in excess of such limitation shall be reduced before allocations are made
to the Employee's Account.

         If in any Plan Year the Annual  Addition  of an  Employee  exceeds  the
limitation  set  forth  in this  Section  5.7 as a  result  of (i) an  error  in
estimating an Employee's Compensation, (ii) the allocation of forfeitures, (iii)
a reasonable error in determining the amount of salary  reduction  contributions
(within  the  meaning  of Section  402(g)(3)  of the Code) that may be made with
respect to an  Employee  under the limits of  Section  415 of the Code,  or (iv)
under other limited facts and circumstances as determined by the Commissioner of
Internal Revenue,  then the Company shall reduce such Employee's Annual Addition
to the extent of such excess in the manner described below:

                  (a)  First,  by  reducing  the  Employee's   Salary  Reduction
Contributions  allocated to his Account and any Matching Employer  Contributions
attributable  thereto and  distributing  to the Employee the amount by which his
Salary  Reduction  Contributions  have  been  reduced.  The  amount by which his
Matching Employer Contributions have been reduced shall be forfeited. The amount
so forfeited  shall be treated as Matching  Employer  Contributions  or Employer
contributions, or both, to the extent there are any such contributions that have
not yet been paid for the Plan Year.  Any  remaining  amount shall be applied to
reduce Matching Employer  Contributions and Employer contributions under Section
4.1 hereof in the next following Plan Year and each Plan Year  thereafter  until
such amount is reduced to zero.

                  (b) Second, by reducing the amount of forfeitures in excess of
those  applied  under  Section  5.5(b)  hereof  to  reduce   Matching   Employer
Contributions  allocated  to such  Employee's  Account  for such  Plan  Year and
allocating the amount of such reduction among the Accounts of other Employees as
provided under Section 5.5 hereof.

                  (c) Third, by reducing the amount of forfeitures  allocated to
such  Employee's  Account  that were not used to reduce  employer  contributions
under other plans  maintained by an Employer,  in  accordance  with the terms of
each such plan.

                  (d)  Fourth,  by  reducing  the  Employer  contributions  made
pursuant  to Section  4.1  hereof  (including  any  allocation  of  forfeitures)
allocated to such Employee and allocating the amount by which such allocation is
reduced to a  suspense  account.  In the next  following  Plan Year,  the amount
allocated  to  the  Employee's  suspense  account  shall  be  allocated  to  the
Employee's  Account to the extent permissible under this Section 5.7 in the same
manner as a  Matching  Employer  Contribution  under  Section  4.3  hereof or an
Employer contribution under

                                      -26-

<PAGE>



Section 4.1 hereof  before any other  amounts are  allocated  to the  Employee's
Account under such Sections.  For each  subsequent Plan Year, any amount held in
the Employee's suspense account shall be reallocated to his Account as described
in the preceding sentence until the amount in the suspense account is exhausted.
If the  Employee is not  eligible to receive an  allocation  as of any such Plan
Year,  any amount  remaining in his suspense  account  shall be allocated to the
Accounts of all Employees in the same manner as forfeitures.

                  (e) Fifth,  by  reducing  employer  contributions  under other
plans maintained by any Employer according to the terms of each such plan.

                  (f) If a  suspense  account  created  under this  Section  5.7
exists  at any  time  during  a Plan  Year,  such  suspense  account  shall  not
participate in the allocation of the Plan's investment gains and losses.

                  (g) For  purposes  of this  Section  5.7,  Compensation  means
compensation  that is  includible  in gross  income and is actually  paid to the
Employee during the 12-month period ending on the Annual Valuation Date.

         5.8      Establishment of Designated Funds.
                  ---------------------------------
                  (a) The Company  directs the Committee to cause the Trustee to
establish  Designated  Funds in accordance with subsection (b) below among which
Employees  shall be allowed to direct the  investment of all, or such portion as
the Company shall allow,  of their  Accounts.  The Committee  shall undertake to
identify each Designated Fund according to its principal  characteristics (e.g.,
"fixed income fund" or "equity fund") for the convenience of the Employees,  but
the Committee  shall in no way be liable or  responsible  for the failure of any
fund so  designated  to attain or maintain the  characteristics  by which it has
been so identified.

                  (b) The  Committee  shall  direct the Trustee to  establish as
Designated  Funds the Aerial Common Stock Fund,  which fund shall be invested by
the Trustee in Aerial Common Shares, the TDS Common Stock Fund, which fund shall
hold only those TDS Common  Shares  transferred  to the  Trustee  from the trust
created  under the TDS Plan,  and the USCC Common  Stock Fund,  which fund shall
hold only those USCC Common  Shares  transferred  to the Trustee  from the trust
created under the TDS Plan.  Investment of Accounts in the TDS Common Stock Fund
and the USCC Common Stock Fund shall be subject to the limitations  described in
Section 5.9(b) hereof. In accordance with Section 404(c) of ERISA, the Committee
shall  select and also direct the Trustee to establish  as  Designated  Funds at
least 3  collective  investment  funds or  mutual  funds  each of  which  (i) is
diversified, (ii) has materially different risk and return characteristics,  and
(iii) when combined with  investments  in the other such Funds tends to minimize
through diversification the overall risk of the Employees.  The Designated Funds
selected  by the  Committee  shall in the  aggregate  enable  the  Employees  by
choosing  among  them to  achieve a  portfolio  with  aggregate  risk and return
characteristics at any point within the range

                                      -27-

<PAGE>



normally  appropriate  for the  Employees.  The portion of an Employee's  Salary
Reduction Account that is reinvested  pursuant to the preceding  sentence may be
invested in other  Designated  Funds as directed by the  Employee in  accordance
with the terms of the Plan.

                  (c) The  Committee  may at any time and from time to time,  in
the  Committee's  sole  discretion,   expand,  modify  or  otherwise  alter  the
Designated Funds selected by the Committee  pursuant to subsection (b) above and
may establish one or more pooled funds. The Committee shall also have the right,
in the Committee's sole discretion,  to delegate its  responsibility  under this
Section 5.8 to one or more other fiduciaries selected by the Committee.

                  (d) The Director of  Compensation  and Benefits of the Company
is the  fiduciary  responsible  for ensuring  that (i) adequate  procedures  are
established and followed to maintain  confidentiality with respect to Employee's
purchases,  holdings and sales of securities under the Aerial Common Stock Fund,
the TDS Common Stock Fund and the USCC Common Stock Fund and Employees' exercise
of  voting,  tender and  similar  rights  with  respect to such funds and (ii) a
fiduciary independent of the Employers is appointed to carry out activities with
respect to such funds that the  Director  of  Compensation  and  Benefits of the
Company  determines  involve a  potential  for  undue  Employer  influence  upon
Employees with regard to the direct or indirect exercise of shareholder  rights.
The Director of Compensation and Benefits of the Company can be contacted at the
Human Resources Department for the Company at the Company's corporate office.

         5.9      Employee Direction of Investments.
                  ---------------------------------
                  (a) Except as provided in subsection (b) below,  each Employee
shall have the opportunity to direct,  at the time and in the manner  prescribed
by the Company that,  his Rollover  Account,  that portion of the amount of each
Salary Reduction  Contribution  made on his behalf and that portion of his Prior
Plan  Account  that the Company  shall allow the  Employee to direct  investment
thereof  (together,  the  "Self-Directed  Amounts"),  is to be  invested in each
Designated  Fund;  provided  that the Employee may not elect to invest less than
five percent (5%) (or a whole number multiple  thereof) in any Designated  Fund.
The  opportunity  to direct  investment  of the  Self-Directed  Amounts shall be
offered in accordance with Section 404(c) of ERISA. Except as otherwise provided
in Section  404(c) of ERISA,  all  investment  directions  made pursuant to this
Section 5.9 and Section 5.11 hereof shall be followed.  The  fiduciaries for the
Plan will not be liable for any losses that are the direct and necessary  result
of an Employee's investment directions.

                  (b) Each  Employee  who,  immediately  prior to the  Effective
Date,  was a participant in the TDS Plan and had all or a portion of his account
under the TDS Plan  invested  in the TDS Common  Stock  Fund or the USCC  Common
Stock Fund shall be  permitted  to continue  such  investments  under this Plan.
Notwithstanding anything contained herein to the contrary,  however, no employee
(including an Employee described in the preceding sentence)

                                      -28-

<PAGE>



shall be  permitted  to direct any portion of his  Self-Directed  Amounts or any
other  portion of such  Employee's  current  Account to be  invested  in the TDS
Common  Stock Fund or the USCC Common Stock Fund.  An Employee  described in the
first sentence  above may direct,  at the time and in the manner that changes in
investment  elections may be made under this Plan, as prescribed by the Company,
that all or any portion of his account  invested in the TDS Common Stock Fund or
the USCC Common Stock Fund be invested in any other  Designated  Fund;  provided
that the Employee may not  thereafter  direct that any amounts be  reinvested in
the TDS Common Stock Fund or the USCC Common Stock Fund.

                  (c) In the event any Employee fails to so direct the manner of
investment of any contribution and deliver such direction in the time and manner
specified by the Company, such contribution shall be invested as directed by the
Committee in the Designated Fund with the least risk of loss of principal.

         5.10 Fund Allocations. Dividends, interest, gains, losses, expenses and
              ----------------
other  distributions  received by the Trustee with respect to a Designated  Fund
shall be allocated to that Designated Fund.

         5.11 Duration of  Investment  Election.  An investment  direction by an
              ---------------------------------
Employee shall continue in effect until changed by such Employee at the time and
in the manner  prescribed  by the Company.  An Employee's  investment  direction
applicable to future  Salary  Reduction  Contributions  may be changed as of the
first day of the next  payroll  period  administratively  practicable  after the
change in direction is received by the Company or its  designee.  An  Employee's
investment direction applicable to his current Account balance may be changed as
of the next Valuation  Date  administratively  practicable  after such change in
direction is received by the Company or its designee.


         ARTICLE 6.        PAYMENT OF BENEFITS.

         6.1  Retirement.  An Employee  who attains his Normal  Retirement  Date
              ----------
shall have a  nonforfeitable  right to the entire  balance  in his  Account.  An
Employee  whose  Service  terminates  due to  retirement  on or after his Normal
Retirement  Date shall be  entitled  to his  Account  determined  as of the next
Valuation  Date   administratively   practicable   following  the  date  of  his
retirement.  Such Account shall be distributed in accordance with the provisions
of this Article 6.

         6.2 Disability.  An Employee whose Service  terminates due to Total and
             ----------
Permanent  Disability  shall be  entitled  to the entire  balance in his Account
determined as of the next Valuation Date administratively  practicable following
the date of such  disability.  Such Account shall be  distributed  in accordance
with the provisions of this Article 6.


                                      -29-

<PAGE>



         6.3 Death. The Beneficiary of an Employee whose Service  terminates due
             -----
to his death shall be entitled to the entire balance in such Employee's  Account
determined as of the next Valuation Date administratively  practicable following
the date of his death.  Such Account shall be distributed in accordance with the
provisions of this Article 6.

         6.4 Other Termination of Service.
             ----------------------------
                  (a) An Employee whose Service  terminates for any reason other
than  Retirement,  Total and Permanent  Disability or death shall be entitled to
receive the entire  balance in his Salary  Reduction  Contributions  Account and
Rollover Account and, if any, the portion of his Prior Plan Account attributable
to Before-Tax  Contributions  and amounts rolled over from another plan, and the
following  percentage  of the  balance  in his  Employer  Account  and  Employer
Matching  Account and, if any, the remaining  balance in his Prior Plan Account,
determined as of the next Valuation Date administratively  practicable following
the date of such  termination  (such Account shall be  distributed in accordance
with the provisions of this Article 6):


                                                            Nonforfeitable
       Years of Vesting Service                               Percentage
       ------------------------                             --------------
Less than 1                                                       0%
At least 1, but less than 2                                      34%
At least 2, but less than 3                                      67%
3 years or more                                                 100%

                  (b)  Notwithstanding  subsection  (a)  above,  if an  Employee
participated in the TDS Plan or an Amended Plan, such Employee's non-forfeitable
percentage under subsection (a) above shall not be less than his non-forfeitable
percentage  determined under the TDS Plan or such Amended Plan. In addition,  in
the case of an Employee described in the preceding sentence who is credited with
3 or more years of Vesting Service under an Amended Plan, such Employee shall be
permitted  to  elect  to have  his  non-forfeitable  percentage  under  the Plan
determined in accordance with the vesting  schedule in effect under such Amended
Plan without regard to subsection (a) above.

                  (c) Any forfeitable balance remaining in the Employer Account,
Employer  Matching  Account or Prior Plan Account of an Employee who  terminates
Service shall be forfeited  and allocated in accordance  with Section 5.5 hereof
in the Plan Year in which such Employee's Service terminates.

                  (d) If an  Employee  who was not fully  vested in his  Account
when he  terminated  Service  and who  subsequently  returns  to  Service  after
receiving a distribution of the  nonforfeitable  balance in his Account,  he may
repay the full amount of such distribution to the

                                      -30-

<PAGE>



Plan on or before  the  earlier of (i) the  Annual  Valuation  Date on which the
Employee incurs 5 consecutive Breaks in Service following such distribution, and
(ii) the end of the 5-year period  beginning with the date the Employee  returns
to  Service.  Upon such  repayment,  the  Employee's  Account  shall be restored
without adjustment for any allocations provided under Article 5 hereof.

         6.5      Payment of Benefits.
                  -------------------
                  (a) An Employee who terminates  Service on or after his Normal
Retirement  Date shall  receive the  nonforfeitable  balance in his Account in a
single  lump sum not later  than 60 days after the  Annual  Valuation  Date next
following such termination of Service. An Employee who terminates Service before
his Normal  Retirement  Date shall  receive  the  nonforfeitable  balance in his
Account in a single lump sum as soon as  practicable  after the  Valuation  Date
next following the  Employee's  termination of Service or as soon as practicable
after the Valuation  Date next  following the date the Employee has provided all
required distribution information, if such balance does not exceed $5,000; or if
the nonforfeitable balance in his Account exceeds $5,000, the Employee may elect
to receive  the  nonforfeitable  balance in his Account in a single lump sum (i)
within 60 days after the Annual Valuation Date next following his termination of
Service,  (ii) not later  than 60 days  after  the  Annual  Valuation  Date next
following  his  Normal  Retirement  Date or  (iii)  as soon as  administratively
practicable  after the Valuation Date next following the later of the Employee's
termination  of Service and the date the  Employee has  properly  completed  and
delivered all required  distribution forms.  Notwithstanding  anything contained
herein to the contrary,  an Employee  whose Service  terminates due to Total and
Permanent  Disability  may elect to receive  the  nonforfeitable  balance in his
Account in a single  lump sum within 60 days  after any  Annual  Valuation  Date
following   such   Employee's   termination   of   Service,   or,   as  soon  as
administratively  practicable  after the Valuation Date next following the later
of the Employee's  termination of Service and the date the Employee has properly
completed and delivered all required  distribution  forms, but in no event later
than the  earlier of (i) the date on which he returns to work for an Employer or
Affiliate and (ii) 60 days after the Annual  Valuation  Date next  following his
Normal Retirement Date.

                  (b)  Notwithstanding  subsection (a) above,  an Employee whose
nonforfeitable  balance in his Account  exceeds  $5,000 may elect to receive the
distribution  of the  nonforfeitable  balance in his Account,  commencing at the
time a lump sum  distribution  would  commence under  subsection  (a) above,  in
substantially  equal  annual  or  more  frequent   installments  over  a  period
determined  by the  Employee  which  does not  exceed  the  joint  life and last
survivor  expectancy of the Employee and his designated  Beneficiary  (provided,
however, that the present value of the payments to be made to the Employee shall
be more than 50% of the  present  value of the total  payments to be made to the
Employee  and  his  designated  Beneficiary,  determined  as of  the  date  such
installments  commence).  Such  installments  shall  continue  until the  entire
nonforfeitable  balance in the Employee's Account has been distributed.  Further
notwithstanding  subsection  (a) above and this  subsection  (b), if an Employee
participated  in an Amended Plan,  such  Employee  shall be entitled to elect to
receive distribution of his Prior Plan Account, if any, in any manner

                                      -31-

<PAGE>



permitted  under such  Amended  Plan,  as set forth in an  Appendix to this Plan
which specifically names the Amended Plan in which such Employee participated.

                  (c) Any  nonforfeitable  balance in an Employee's  Account not
distributed  after the Valuation Date next following the Employee's  termination
of Service  shall remain in the Trust and, in  accordance  with Article 5, shall
continue,  until the next Valuation Date administratively  practicable following
the  date the  Employee  has  properly  completed  and  delivered  all  required
distribution  forms, to participate in the allocation of income,  gains,  losses
and  expenses,  but shall not  continue  to  participate  in the  allocation  of
contributions and forfeitures.

                  (d) If an Employee dies prior to receiving the  nonforfeitable
balance in his Account,  such balance shall be  distributed in a single lump sum
to his Beneficiary within 5 years after the date of his death.

                  (e) If,  after  the  Effective  Date,  an  Employee  fails  to
terminate  Service by the April 1  immediately  following  the calendar  year in
which he attains  age 70-1/2,  distribution  of such  Employee's  nonforfeitable
balance in his Account (i) shall  commence,  in the case of an Employee who is a
5-percent  owner as defined in Section 416(i) of the Code, or (ii) may commence,
upon any other  such  Employee's  election,  in either  case on the April 1 next
following the calendar year in which the Employee attains age 70-1/2.  If at the
time of the distribution such Employee's non-forfeitable balance exceeds $5,000,
the  nonforfeitable  balance in the  Employee's  Account shall be distributed in
substantially  equal annual or more  frequent  cash  installments  over a period
determined  by the  Employee  which  does not  exceed  the  joint  life and last
survivor  expectancy of the Employee and his designated  Beneficiary  (provided,
however, that the present value of the payments to be made to the Employee shall
be more than 50% of the  present  value of the total  payments to be made to the
Employee  and  his  designated  Beneficiary,  determined  as of  the  date  such
installments  commence).  Such  installments  shall  continue  until the  entire
nonforfeitable  balance in the Employee's  Account has been  distributed  or, if
earlier,  until the  Employee's  termination  of Service (at which time the then
nonforfeitable  balance in the Account shall be distributed  in accordance  with
subsection  (a) above).  Notwithstanding  the  preceding  sentence,  an Employee
(other than a 5 percent owner) who is in Service after he attains age 70-1/2 may
elect to stop such installments at any time. If such Employee's  non-forfeitable
balance at the time of distribution does not exceed $5,000,  notwithstanding any
provision to the  contrary,  the Company  shall direct the Trustee to distribute
the entire non-forfeitable  Account balance to the Employee in a single lump sum
no later than April 1 of the calendar year  following the calendar year in which
such Employee attains age 70-1/2.

                  (f) Payment of benefits hereunder shall be made in cash except
to the extent that the Employee's Account is invested in the Aerial Common Stock
Fund,  the TDS Common Stock Fund or the USCC Common Stock Fund in which case, to
the extent his Account is so  invested,  payment  shall be made in whole  Aerial
Common Shares, TDS Common Shares or

                                      -32-

<PAGE>



USCC  Common  Shares,  respectively  (plus cash in lieu of  fractional  shares),
unless the Employee elects to be paid entirely in cash.

                  (g) For  purposes  of  determining  the  minimum  amount to be
distributed  under any annuity form of benefit  during a calendar year, the life
expectancies of an Employee and such Employee's  Beneficiary shall be calculated
using the Employee's and the Beneficiary's attained ages in the calendar year in
which the Employee attains age 70-1/2.

                  (h)  Notwithstanding  anything herein to the contrary,  in the
case of a  distribution  from the Plan  (excluding any amount offset against the
Employee's Account to repay the outstanding balance of any unpaid loan) which is
an eligible rollover distribution within the meaning of Section 402 of the Code,
an  Employee  (or  surviving  spouse of an  Employee)  may elect that all or any
portion of such  distribution to which he is entitled which equals at least $200
shall be directly transferred as a rollover contribution from the Plan to one of
the following:  (i) an individual retirement account described in Section 408(a)
of the Code, (ii) an individual  retirement  annuity described in Section 408(b)
of the Code,  (iii) an annuity plan  described in Section 403(a) of the Code, or
(iv) another plan qualified under Section 401(a) of the Code (provided, however,
that a surviving spouse of an Employee may only elect to have such  distribution
transferred   directly  to  an  individual   retirement  account  or  individual
retirement  annuity).   Notwithstanding  the  foregoing,  an  Employee  (or  his
surviving  spouse) shall not be entitled to elect to have a portion which equals
less  than the total  amount  of such  distribution  transferred  as a  rollover
contribution  as described in the preceding  sentence unless such portion equals
at least  $500.  At least 30 days and no more than 90 days  prior to the date on
which an Employee is entitled to receive a  distribution  from the Plan (or such
other  time  as  prescribed  by  law),  the  Company  shall  provide  a  written
explanation to the Employee (or his surviving spouse) of the availability of the
direct  rollover  option,  the rules  that  require  income tax  withholding  on
distributions,  the rules under which the Employee (or his surviving spouse) may
roll over the distribution  within 60 days of receipt and, if applicable,  other
special tax rules that may apply to the distribution.

                  (i)  Notwithstanding  anything herein to the contrary,  in the
event that the recordkeeper for the Plan is changed,  distributions  may be made
at such time as prescribed by the Company in order to  accommodate  the transfer
of records to the new recordkeeper.

         6.6      Designation of Beneficiary.
                  --------------------------
                  (a) Each Employee who has an unpaid balance in his Account may
file with the Company from time to time a written  designation  of  Beneficiary,
and any payments  required under the Plan to be made upon the  Employee's  death
shall be made to such Beneficiary. Notwithstanding any prior designation, if the
Employee has a Surviving Spouse at the time of his death, the Trustee shall make
any  required  payments to the  Surviving  Spouse  unless the  Employee  and his
Surviving Spouse shall have designated an alternate beneficiary in the manner

                                      -33-

<PAGE>



described in subsection (b) below.  If an Employee fails to validly  designate a
Beneficiary, or if no designated Beneficiary survives the Employee, any payments
required  hereunder  shall  be made by the  Trustee  in the  following  order of
priority:

                  (i)      to the Employee's Surviving Spouse; or if none,

             (ii) to the Employee's descendants, per stirpes; or if none,

            (iii) to the executor or administrator of the Employee's  estate; or
         if no  executor or  administrator  shall have been  appointed  for such
         Employee's  estate  within  six  months  following  the  date  of  such
         Employee's death,

             (iv) to the  person  or  persons  who would be  entitled  under the
         intestate  succession  laws of the state of the Employee's  domicile to
         receive the Employee's  personal estate in the proportions  provided in
         such laws.

                  (b) At any time prior to the Employee's  death,  the Employee,
with the consent of his Surviving Spouse, may designate a Beneficiary other than
his Surviving  Spouse.  The Surviving  Spouse's  consent shall  acknowledge  the
effect of the Employee's designation and shall be witnessed by a Notary Public.

                  (c) Any  designation  made by an  Employee  and his  Surviving
Spouse  described in subsection (b) above may be revoked in writing  without the
Surviving  Spouse's  consent and a new designation made at any time prior to the
Employee's  death. Any new  designations  must again satisfy the requirements of
subsection (b) above.

                  (d) For purposes of this Section 6.6,  Surviving  Spouse means
the person to whom the  Employee  has been  married  during the entire  12-month
period ending on the date of his death.

         6.7  Location  of  Employee  or  Beneficiary  Unknown.  If any  benefit
              ------------------------------------------------
attributable  to an Employee's  Account  remains  unpaid for a period of 5 years
solely  because the location of such  Employee or  Beneficiary  is unknown,  the
Employee's  Account  shall be  forfeited  and shall be  applied  to  reduce  his
Employer's  contributions  under  Article 4 hereof.  The  Company  shall use due
diligence to notify an Employee or Beneficiary including registered mail, return
receipt requested,  at his last known address.  If an Employee or Beneficiary is
located after his Account has been so  forfeited,  such Account will be restored
without adjustment for any allocations provided under Article 5, hereof.

         6.8  Distribution   After  Age  59-1/2.   Any  Employee  may  direct  a
              ---------------------------------
distribution of all or any portion of his Salary Reduction Contributions Account
at anytime after he attains age 59-1/2 upon written request to the Company.

                                      -34-

<PAGE>



         6.9      Hardship Withdrawal.
                  -------------------
                  (a) If an  Employee  establishes  to the  satisfaction  of the
Company his need for funds because of a hardship resulting from (i) the purchase
(excluding  mortgage  payments)  of a primary  residence,  (ii) the  payment  of
tuition for the next twelve months of post-secondary education for the Employee,
his spouse or his  children,  or (iii) a  demonstrable  financial  emergency  as
determined by the Company in a uniform and non-discriminatory manner arising out
of a medical  condition,  accidental  injury  or other  calamity  affecting  the
Employee,  his spouse or children, he shall be entitled to a hardship withdrawal
from his Salary Reduction  Contributions Account and, if any, the portion of his
Prior Plan Account  attributable to Before- Tax Contributions in accordance with
subsection (d) below.

                  (b) The amount of such hardship withdrawal shall be determined
by the Company, in its sole discretion,  but shall not exceed the lesser of: (i)
the Employee's need for funds, which need shall include any amounts necessary to
pay  any  federal,   state,  or  local  income  taxes  or  penalties  reasonably
anticipated  to result from the  distribution,  (ii) the aggregate of his Salary
Reduction Contributions and, if any, Before-Tax  Contributions,  in either case,
for the current and all previous Plan Years  (reduced by the amount of all prior
hardship  withdrawals  under  the  Plan),  and  (iii)  the  amount  that  is not
reasonably  available from other resources of the Employee (including Plan loans
pursuant  to Section  6.10  hereof).  For  purposes  of this  Section  6.9,  the
aggregate  of  an  Employee's  Salary  Reduction   Contributions  and,  if  any,
Before-Tax  Contributions  shall be  determined  as of the next  Valuation  Date
administratively  practicable  following  his  request  without  regard  to  the
allocations of income, expense or gain thereon.

                  (c)  Such  amount  shall  be  distributed  in  cash as soon as
practicable  after  determination  by the Company that such  withdrawal is to be
made,  and such  withdrawal  shall involve no  forfeiture  by the  Employee,  no
suspension  of  participation  for the  Employee and shall not affect his rights
under other provisions of the Plan, except as provided in subsection (d) below.

                  (d) An Employee must request a hardship  withdrawal by written
notice to the  Company.  If such  request is  approved  in  accordance  with the
provisions of this Section 6.9 by the Company,  the Employee may make a hardship
withdrawal  from his Salary  Reduction  Contributions  Account  and, if any, the
portion of his Prior Plan  Account  attributable  to Before-  Tax  Contributions
subject to the following restrictions:

                  (i) if an Employee makes a hardship withdrawal from his Salary
         Reduction  Contributions  Account or, if any,  the portion of his Prior
         Plan Account attributable to Before-Tax  Contributions,  further Salary
         Reduction  Contributions  under  Section 4.2 hereof shall be prohibited
         for 1 year from the date of such withdrawal;


                                      -35-

<PAGE>



             (ii) no hardship  withdrawal  in an amount of less than $500.00 (or
         the aggregate of the Employee's Salary Reduction  Contributions Account
         and, if any,  the  portion of his Prior Plan  Account  attributable  to
         Before-Tax Contributions, if less than $500) shall be permitted; and

            (iii)  hardship  withdrawals  shall not be allowed more than once in
         any 24-month period commencing on the date of each such withdrawal.

         6.10     Plan Loans.
                  ----------
                  (a)  Notwithstanding  anything  herein to the  contrary,  upon
application of an Employee,  the Company may permit the Committee to provide for
a loan  from  the  Plan to such  Employee,  in  accordance  with a  uniform  and
nondiscriminatory policy established by the Committee.

                  (b) The  terms  of any  such  loan  shall  be set  forth  in a
promissory  note made by the Employee and made payable to the order of the Plan.
Loans  from  the  Plan  to  any  Employee   shall  be  secured  by  50%  of  the
nonforfeitable  balance in the borrowing  Employee's  Account and may be further
secured in whole or in part by such  additional  security as the  Committee  may
require.  The amount of any loan to an Employee  (when added to the  outstanding
balance of all other loans to such Employee from the Plan or any other qualified
plan of the Company,  an Affiliate or a Related Entity,  including any principal
amount thereof repaid within the period  beginning 1 year before the date of the
loan  and  ending  on  the  date  of  the  loan)  shall  not  exceed  50% of the
nonforfeitable   balance  in  the  Employee's   Salary  Reduction  and  Rollover
Contributions  Accounts  and,  if any,  the  portion of his Prior  Plan  Account
attributable to Before- Tax  Contributions  and amounts rolled over from another
plan (limited to $50,000).

                  (c) Loans from the Plan  shall be repaid by payroll  deduction
within a period  determined  by mutual  agreement  between the Committee and the
Employee. Such repayment period shall not exceed 5 years.

                  (d)  Loans  from  the Plan  shall  bear a  reasonable  rate of
interest as determined by the Committee.

                  (e) For purposes of Section 5.8 hereof, loans from the Plan to
an Employee shall be treated as an investment in a Designated  Fund and interest
thereon shall be allocated in accordance with Section 5.3(b) hereof.

                  (f) No loan  shall be  permitted  in an  amount  of less  than
$1,000.00.

                  (g)  Repayments of any loan made  pursuant to  subsection  (a)
above shall be suspended  during any period in which an Employee is in qualified
military service (as defined in

                                      -36-

<PAGE>



Section  414(u)(5) of the Code).  Repayments  shall  recommence  at such time as
prescribed by the Committee.  Any such suspension  shall not require the loan to
be treated as a distribution for purposes of Section 72(p) of the Code and shall
not be taken into account for purposes of Sections  401(a) and 4975(d)(1) of the
Code.


         ARTICLE 7.        TRANSFER OF BENEFITS.

         7.1 Transfer of Benefits.  If an Employee  entitled to receive benefits
             --------------------
under the Plan is subsequently  employed by another employer having a pension or
profit  sharing  plan  qualified  under  Sections  401 and 501 of the Code,  the
Company may transfer the Employee's benefits,  in cash or in kind, from the Plan
directly to the trustee or custodian of the plan of the Employee's new employer,
under  uniform  procedures  established  by  the  Company,  and  subject  to the
following conditions:

                  (a) the trustee or custodian of such plan shall be authorized
to accept assets from the Plan;

                  (b) the assets so transferred shall be maintained in a
separate account in such plan; and

                  (c) the  assets so  transferred  shall not be  forfeitable  or
reduce in any way the obligation of the new employer under such plan.

         7.2  Acceptance  of  Transferred  Benefits.  The Company may direct the
              -------------------------------------
Trustee to accept  benefits  from an Employee  (whether  or not the  Employee is
eligible to immediately  participate  herein) who has received benefits from, or
directly from the trustee or custodian of, a qualified pension or profit sharing
plan or an  individual  retirement  account  defined in Section 408 of the Code,
provided  such  benefits are treated as either  "rollover  contributions"  under
Section  408(d)(3) of the Code or "rollover  amounts" under Section 402(a)(5) of
the Code, on behalf of an Employee  entitled to receive such benefits,  upon the
same terms and  conditions  set forth in Section  7.1  hereof.  The  benefits so
accepted shall be maintained in the Rollover Account.  Any benefits delivered by
an Employee must be delivered to the Trustee on or before the 60th day after the
day on which the Employee  receives the  distribution or on or before such later
date as may be prescribed by law.


         ARTICLE 8.        ADMINISTRATION OF THE PLAN.

         8.1  Plan  Administrator.  The  Company  shall be  responsible  for the
              -------------------
administration  of the Plan, in accordance  with the terms hereof and shall have
full power and  authority,  according  to the terms and within the limits of the
Plan:

                                      -37-

<PAGE>



                  (a) to determine all questions  arising in  administration  of
the Plan,  including  the  power to  determine  the  rights  or  eligibility  of
Employees and Beneficiaries and the amounts of their respective interests;

                  (b) to adopt such rules and  regulations  and to exercise such
powers,  rights or  privileges  as the Company  deems  desirable  for the Plan's
administration that are consistent with the purposes of the Plan;

                  (c) to employ such agents, attorneys, actuaries,  accountants,
or other persons (who may also be employees of the Company) as the Company deems
desirable for administration of the Plan, to delegate to such persons duties and
obligations for its administration, and to pay them reasonable compensation;

                  (d) to  determine  all matters with respect to the maturity of
benefits, distributions from the Trust, and the identity of distributes; and

                  (e)      to maintain the Account records of all Employees.

         8.2      Claim for Benefits.
                  ------------------
                  (a)  In  the  event   any  claim  is  made  by  an   Employee,
Beneficiary, or any other person, with respect to the amount of any distribution
under the Plan,  such claimant shall file his claim in writing with the Benefits
Department.

                  (b) The Benefits Department shall review the claim and, unless
special circumstances require an extension of time, within 90 days after receipt
of the  claim,  give  written  notice by  registered  or  certified  mail to the
claimant of its decision regarding the claim. If special  circumstances  require
an extension of time,  the  claimant  shall be so advised in writing  within the
initial 90-day period and in no event shall such an extension exceed 90 days. If
the claim is wholly or  partially  denied,  the notice of the  decision  that is
furnished to any claimant  hereunder  shall  contain the  following  information
written in a manner calculated to be understood by the claimant:

                  (i)     a specific reference to the Plan provisions applicable
                to such claim;

             (ii) the specific reason or reasons for disposition of such claim;

            (iii) if applicable,  a description  of any  additional  material or
         information  necessary  for the  claimant  to perfect  the claim and an
         explanation of why such material or information is necessary; and


                                      -38-

<PAGE>



             (iv) an explanation of the Plan's claim review  procedure set forth
         in subsections (c) and (d) below.

                  (c) Any  claimant  whose  claim has been denied in whole or in
part may request the Committee to review such denial. Any request for the review
of the denial of any such claim  shall be made in  writing to the  Committee  no
later than 60 days after the date the notice  described in subsection  (b) above
is received by such claimant.  In connection  with the review of any such claim,
the  claimant  or his duly  authorized  representative  shall  have the right to
review all  pertinent  documents and submit issues and comments to the Committee
in writing within such 60-day period.

                  (d) The Committee shall promptly review the prior  disposition
of such claim,  and shall notify such claimant of its decision,  in writing,  no
later than 60 days after its  receipt of such  request for such  review,  unless
special  circumstances  require an extension of time.  If special  circumstances
require an extension of time, the claimant shall be so advised in writing within
the  initial  60-day  period and in no event shall such an  extension  exceed 60
days.  The notice of the  Committee's  final  decision  shall  include  specific
reasons for the decision and the specific  references to the Plan  provisions on
which the  decision is based and shall be written in a manner  calculated  to be
understood by the claimant.


         ARTICLE 9.        ADMINISTRATION OF THE TRUST.

                  A Trust shall be created by the execution of a Trust agreement
between the Company and the  Trustee.  The Company and the Trustee  will execute
the Aerial Operating Company,  Inc.  Tax-Deferred  Savings Trust to serve as the
Trust under the Plan. All  contributions  made under this Plan by an Employer or
an Employee shall be paid to the Trustee.  The Trustee shall hold all monies and
other  property  received by it and invest and reinvest the same,  together with
the income therefrom, on behalf of the Employees collectively in accordance with
the provisions of the Trust agreement and, to the extent directed, in accordance
with  Employees'  investment  directions  pursuant to Section  5.9  hereof.  The
Trustee  shall make  distributions  from the Trust Fund at such time or times to
such  person or persons  and in such  amounts  as the  Company  shall  direct in
accordance  with this Plan. The Trust may provide for the collective  investment
of assets of this Plan and assets of such other plans that are  qualified  under
Section  401(a)  of the  Code  and that are  maintained  by the  Company  or any
Affiliate,  provided that such collective investment does not result in the Plan
and such other plans being deemed one plan under Section 414(l) of the Code.



                                      -39-

<PAGE>



         ARTICLE 10.       AMENDMENT OR TERMINATION OF THE PLAN AND
         ADOPTION OF THE PLAN BY OTHER EMPLOYERS.

         10.1 Right to Amend or Terminate.  The Company  intends to continue the
              ---------------------------
Plan and  contributions  hereunder  indefinitely,  but such  continuance  is not
assumed  as  a  contractual  obligation.  The  Company  expressly  reserves  the
exclusive  right,  retroactively  to the extent  permitted  by law,  to amend or
terminate the Plan and to reduce, suspend or discontinue contributions hereunder
at any time and without the consent of any other party,  including any Affiliate
or Related Entity that adopts the Plan,  provided that no such amendment  (other
than an amendment  required to obtain or retain  qualification of the Plan under
the Code) shall operate to deprive any person without his written consent of any
accrued  benefit  hereunder.  Copies  of any  amendment  to the  Plan  shall  be
communicated  to any  Affiliate  or Related  Entity  that  adopts  the Plan.  No
amendment  affecting  the  rights or duties of the  Trustee  shall be  effective
without the written consent of the Trustee. Any amendment to or a termination of
the  Plan  or any  reduction,  suspension  or  discontinuance  of  contributions
hereunder shall be effected by the Board of Directors of the Company.

         10.2 Effect of  Termination.  The Plan may be terminated in whole or in
              ----------------------
part and the  termination  of the Plan by the board of directors of one Employer
with respect to such Employer shall not  automatically  constitute a termination
of the Plan with respect to any other Employers. With respect to that portion of
the Plan that has  terminated,  the Company  shall,  in its  discretion,  either
terminate that portion of the Trust relating to the portion of the Plan that has
terminated  and direct the Trustee to distribute  the assets or hold such assets
in  further  trust  under the  provisions  hereof;  provided,  however,  that no
distribution  of assets  shall be made to an  affected  Employee  if a successor
plan,  as  defined  in  applicable  rules and  regulations,  is  established  or
maintained by such Employee's Employer.  In either such event or in the event of
the complete  discontinuance  of  contributions to the Plan, the Account of each
Employee  with respect to the portion of the Plan that has  terminated  (or with
respect to which there has been a complete  discontinuance  of  contributions to
the Plan) shall become nonforfeitable.


         10.3     Adoption of the Plan by Affiliate or Related Entity.
                  ---------------------------------------------------
                  (a) Any  Affiliate  or Related  Entity may adopt the Plan with
respect to its employees with the written  consent of the Company's  Chairman or
President  by  executing  an  Adoption  Agreement  substantially  in the form of
Appendix B. Each  Affiliate or Related  Entity that adopts the Plan delegates to
the Company the right to act on the  Affiliate's or Related  Entity's  behalf in
all  matters  pertaining  to  the  Plan,   including  but  not  limited  to  the
administration,  amendment and  termination  of the Plan, as may be necessary or
desirable from time to time in the sole judgment of the Company.


                                      -40-

<PAGE>



                  (b) The adoption of the Plan by an Affiliate or Related Entity
shall not be considered  the adoption of a new plan by such Affiliate or Related
Entity  for  purposes  of  Section  414(l)  of the  Code  and any  contributions
(including  the income  earned  thereon)  by such  Affiliate  or Related  Entity
thereto shall be made  available to pay benefits to any employee or  beneficiary
of the Company or any other Affiliate or Related Entity that adopts the Plan.

                  (c) An  Affiliate  or Related  Entity  shall not be treated as
adopting the Plan (under  subsection (b) above) solely because employees of such
Affiliate or Related  Entity are included in the  definition  of  Employees,  as
defined in Article 2 hereof.

                  (d) The Company has  consented  to the adoption of the Plan by
the Affiliates and Related Entities listed in Appendix A.

         10.4  Adoption of the Plan by  Successor.  The Plan shall not be deemed
               ----------------------------------
terminated  by reason of the  transfer  of the  business  of the  Company  or an
Affiliate  or Related  Entity to a successor or  successors  by means of merger,
acquisition  of the Company's or an Affiliate's  or Related  Entity's  assets or
stock,  or  otherwise,  at any time or times,  if such  successor or  successors
adopts the Plan with the  intention of continuing it and notifies the Trustee in
writing of such adoption.


         ARTICLE 11.       GENERAL PROVISIONS.

         11.1 Merger or  Consolidation  with Another  Plan.  In the event of any
              --------------------------------------------
merger or consolidation of the assets of the Plan with, or transfer of assets or
liabilities  to, any other plan,  trust or fund  established and qualified under
Sections 401 and 501 of the Code,  each Employee in this Plan at the time of any
such event shall, after the merger, consolidation or transfer, have the right to
receive an accrued benefit which is equal to or greater than the accrued benefit
he  would  have  been  entitled  to  receive  immediately  before  such  merger,
consolidation, or transfer (if the Plan had then terminated).

         11.2     Nonreversion.
                  ------------
                  (a) It shall be  impossible  for any  assets of the Plan to be
used for or  diverted  to  purposes  other  than for the  exclusive  benefit  of
Employees or Beneficiaries  (including the payment of the expenses of the Trust)
or for any funds to revert to any Employer, except as otherwise provided in this
Section 11.2.

                  (b) If the  establishment  of the  Plan  and  Trust  fails  to
qualify  under  Sections 401 and 501 of the Code  because the  Internal  Revenue
Service  issues an adverse  determination  letter,  and if the  application  for
determination  was submitted to the Internal Revenue Service before the due date
of the Employer's federal income tax return for the taxable year of the Employer
in which the Plan was adopted (or such later time as may be permitted under

                                      -41-

<PAGE>



applicable rules and  regulations),  the Trustee shall,  upon written request of
the Company,  return to the Employer the portion of the Trust Fund applicable to
Employees and former  Employees of such Employer  within one year after the date
the Internal Revenue Service issues such adverse determination letter.

                  (c) If an Employer  contribution under Section 4.1 hereof or a
Matching  Employer  Contribution  under  Section 4.3 hereof is  disallowed  as a
deduction  under  Section 404 of the Code,  then, to the extent the deduction is
disallowed,  the Trustee shall, upon the written request of the Employer, return
the contribution to the contributing  Employer within 1 year after the date that
the deduction is disallowed.

                  (d) If a contribution  under Section 4.1 hereof or Section 4.3
hereof or any portion  thereof is made by an  Employer  under a mistake of fact,
the Trustee shall, upon written request of the Employer, return the contribution
or such portion to the  Employer  within 1 year after the date of payment to the
Trustee.

                  (e) If, after all liabilities of the Plan have been satisfied,
any residual  assets  remain when the Plan is  terminated,  such assets shall be
returned to participating Employers in such portions as the Company determines.

                  (f) Any  contribution  to be  returned  to an  Employer  under
subsections (c) or (d) above shall be (i) the amount contributed,  less (ii) the
amount  that  would  have   otherwise  been   contributed,   less  (iii)  losses
attributable thereto.

         11.3     Nonalienation.
                  -------------
                  (a) To the  fullest  extent  permitted  by law,  no  right  or
interest of any  Employee or  Beneficiary  arising out of or created by the Plan
either  before or after  termination  of Service  shall be subject to execution,
attachment,  garnishment  or other legal or judicial  process  whatsoever by any
person, whether as a creditor or otherwise. Except as provided in subsection (b)
below, no Employee or Beneficiary shall have any right to alienate,  encumber or
assign any of the payments or proceeds or any other  interest  arising out of or
created by the Plan, and any action to do so shall be void.

                  (b)  Subsection  (a) above  shall  not  apply to any  domestic
relations order which is determined to be a qualified  domestic relations order,
as  defined in Section  414(p) of the Code.  The  Company  shall  adopt  written
procedures to determine the qualified status of domestic relations orders and to
administer distributions under such qualified orders. A domestic relations order
determined  to be a  qualified  domestic  relations  order shall not require the
payment of benefits to any  alternate  payee  before the earlier to occur of (i)
the earliest  date as of which payment of the  nonforfeitable  percentage of the
Employee's  Account could  commence (i) if he terminated  employment on his 50th
birthday or (II) following his termination of employment,

                                      -42-

<PAGE>



whichever shall occur first,  and (ii) as soon as  administratively  practicable
after the date such  order is  determined  by the  Benefits  Department  to be a
qualified domestic relations order.

         11.4  Facility of Payment.  If at any time any person to whom  benefits
               -------------------
are payable  hereunder is under a legal  disability  or is in the opinion of the
Company incapable of properly managing his affairs,  the Company may expend such
benefits for the benefit of such person,  or may pay such  benefits  over to the
parent,  guardian or custodian under any Uniform  Transfers (or Gifts) to Minors
Act or to any person with whom the person is residing without responsibility for
its expenditure.

         11.5  Indemnification.  The Company  shall  indemnify  its officers and
               ----------------
employees  from and against any and all claims,  losses,  damages,  expenses and
liability,  including  attorney's  fees,  that arise out of an alleged breach of
fiduciary duty, other than claims, costs, losses, damages,  expenses,  liability
and  attorney's  fees  incurred  as a result  of  gross  negligence  or  willful
misconduct  of such a person.  The  Company  shall have the  right,  but not the
obligation,  to conduct the defense of any officer or employee in a suit brought
alleging a breach of fiduciary duty.

         11.6 Limitation of Rights.  An Employee and his Beneficiary  shall have
              --------------------
no right,  title or claim in or to any  specific  asset of the Trust,  but shall
have the  right  only to  distributions  from the  Trust  Fund on the  terms and
conditions herein provided.

         11.7 Employment  Non-Contractual.  The Plan is purely  voluntary on the
              ---------------------------
part of the  Employers.  Neither the  establishment  of the Plan nor any changes
therein, shall be construed as giving any Employee or any other person any legal
or equitable right against any Employer or the Trustee, unless the same shall be
specifically  provided  for herein,  or as giving any  Employee  the right to be
retained  in an  Employer's  employ.  All  Employees  shall  remain  subject  to
discharge  from  employment  to the same  extent as if the Plan had  never  been
established.

         11.8 Governing Laws. The Plan shall be construed and enforced according
              --------------
to the laws of the State of Illinois and,  where  applicable,  the provisions of
ERISA.  In the event of any  conflict  between the  provisions  of ERISA and the
provisions  hereof,  the former shall apply and the Plan shall be interpreted to
the extent  necessary to eliminate any such  conflicts.  Each  provision  hereof
shall be treated as separable,  so that if any one or more  provisions  shall be
adjudged  or  declared  illegal,  invalid or  unenforceable,  this Plan shall be
interpreted, and shall remain in full force and effect, as though such provision
or provisions had never been contained herein.



                                      -43-

<PAGE>



         ARTICLE 12.       TOP-HEAVY PROVISIONS.

         12.1     Determination of Top-Heaviness.
                  ------------------------------
                  (a) The Plan  shall be  "Top-Heavy"  for any Plan  Year if the
Accounts  of  Key  Employees  exceed  60%  of the  Accounts  of  all  Employees,
determined as of the Annual Valuation Date  immediately  preceding the Plan Year
for which Top-Heaviness is being determined.

                  (b) For purposes of determining  Top-Heaviness,  (i) all other
qualified plans of the Employers in which a Key Employee participates,  (ii) all
other qualified  plans that enable the Plan to meet the  requirements of Section
401(a)(4) or 410 of the Code,  and (iii) in the  discretion of the Company,  all
other qualified  plans  maintained by the Employers shall be aggregated with the
Plan.

                  (c) For purposes of determining Top-Heaviness,  the Account of
any Employee shall be increased by (i) any contribution  that was due but unpaid
as of the applicable  Annual  Valuation  Date, and (ii) any  distribution of the
Employee's Account during the 5-Plan Year period ending on the applicable Annual
Valuation  Date,  and (iii) any rollovers  and transfers to the extent  required
under Section 416(g)(4) of the Code.

                  (d) For purposes of determining Top-Heaviness,  the Account of
any Employee  shall be disregarded if (i) the Employee is not a Key Employee for
the Plan  Year but was a Key  Employee  for any  prior  Plan  Year,  or (ii) the
Employee had not  performed  any services for an Employer at any time during the
5-Plan Year period ending on the Annual Valuation Date.

                  (e) For purposes of this  Article 12, Key  Employee  means any
Employee  who, at any time  during the 5-Plan  Year period  ending on the Annual
Valuation Date provided in subsection (a) above, is or was:

                  (i) an officer of the Company or Affiliate whose  Compensation
         exceeds 50% of the dollar amount  specified in Section  415(b)(1)(A) of
         the Code;  provided,  however,  that no more than the  lesser of (i) 50
         Employees, and (ii) the greater of 3 Employees and 10% of all Employees
         shall be treated as officers;

             (ii) 1 of the 10  Employees  who own the largest  interests  in the
         Company or  Affiliate  (which  ownership  interest is more than 1/2% in
         value in the Company or any Affiliate) and whose  Compensation  exceeds
         the dollar limit specified in Section 415(c)(1)(A) of the Code;

            (iii) a 5% owner of the Company or Affiliate; or

                                      -44-

<PAGE>



             (iv) a 1% owner of the  Company  or  Affiliate  whose  Compensation
exceeds $150,000.

         12.2 Minimum Allocation. For each Plan Year that the Plan is Top-Heavy,
              ------------------
the  allocation  of  Employer  contributions  (not  including  Salary  Reduction
Contributions  or  Matching  Employer  Contributions)  to the  Account  of  each
Employee who had not  terminated  Service  during the Plan Year and who is not a
Key  Employee  shall  not be less than the  lesser of (a) 3% of such  Employee's
Compensation,  or (b) the  largest  percentage  allocated  to any  Key  Employee
(determined   by  dividing   the   allocation   to  such  Key  Employee  by  his
Compensation). For purposes of satisfying the requirements of this Section 12.2,
all defined  contribution plans of the Employers (without regard to whether such
plans have been terminated) shall be aggregated.

         12.3  Minimum Vesting.
               ---------------
                  (a)  For  each  Plan  Year  that  the  Plan is  Top-Heavy,  an
Employee's  nonforfeitable  percentage  of the balance in his  Employer  Account
shall be determined under the following schedule,  if such schedule results in a
larger percentage than that determined under Section 6.4 hereof:


                                                             Nonforfeitable
      Years of Vesting Service                                 Percentage
      ------------------------                                -----------
Less than 2                                                        0%
At least 2, but less than 3                                       20%
At least 3, but less than 4                                       40%
At least 4, but less than 5                                       60%
At least 5, but less than 6                                       80%
6 or more                                                        100%

                  (b) For any  subsequent  Plan Year in which the Plan ceases to
be  Top-Heavy,  an  Employee's  nonforfeitable  percentage  shall be  determined
without regard to subsection (a) above;  provided,  however,  that an Employee's
nonforfeitable  percentage  shall  not be less  than the  applicable  percentage
determined under subsection (a) above in any Plan Year during which the Plan was
Top-Heavy.

                  (c)  Notwithstanding   subsection  (b)  above,  an  Employee's
nonforfeitable  percentage  shall continue to be determined under subsection (a)
above,  if such  Employee  has  completed  at least 3 Years of Service as of the
beginning of the Plan Year in which the Plan ceases to be Top-Heavy.

         12.4   Definitions.   For   purposes  of  this  Article  12,  the  term
                -----------
"Compensation"  shall mean  compensation  that is includible in gross income and
that is actually paid to the Employee during the Plan Year.

                                      -45-

<PAGE>



                  IN WITNESS WHEREOF,  the Company has caused this instrument to
be executed by its duly authorized officer this 22nd day of November, 1999.


                                               AERIAL OPERATING COMPANY, INC.



                                                By:      /s/ Donald W. Warkentin
                                                         -----------------------
                                                         President










<PAGE>



                                                                     EXHIBIT 4.4



                           Tax-Deferred Savings Trust




<PAGE>








                         AERIAL OPERATING COMPANY, INC.
                           TAX-DEFERRED SAVINGS TRUST



<PAGE>




                         AERIAL OPERATING COMPANY, INC.
                           TAX-DEFERRED SAVINGS TRUST


                                TABLE OF CONTENTS
                                -----------------
                                                                            Page
                                                                            ----

ARTICLE 1  TRUST, FUND AND TRUSTEE.............................................2
         Section 1.1.  Trust...................................................2
         Section 1.2.  Fund....................................................2
         Section 1.3.  Trustee and its Agents..................................2

ARTICLE 2  PLANS...............................................................3
         Section 2.1.  Delivery of Plan to Trustee.............................3
         Section 2.2.  Participating Employers.................................3

ARTICLE 3  AUTHORIZED EMPLOYER REPRESENTATIVES.................................3

ARTICLE 4  CONTRIBUTIONS.......................................................3

ARTICLE 5  DISTRIBUTIONS FROM FUND.............................................4
         Section 5.1.  Company to Direct Distributions.........................4
         Section 5.2.  Withholding of Taxes....................................4
         Section 5.3.  Participant Loans.......................................4
         Section 5.4.  Interests Non-Assignable................................5

ARTICLE 6  INVESTMENT OF FUND..................................................5
         Section 6.1.  Investments Authorized..................................5
         Section 6.2.  Individual Investment Direction.........................6
         Section 6.3.  Investment in Commingled Trust..........................7
         Section 6.4.  Registration of Company Securities......................8

ARTICLE 7  POWERS AND RIGHTS OF TRUSTEE........................................8
         Section 7.1.  Trustee's Powers........................................8
         Section 7.2.  Restrictions on Power to Vote and Related Rights.......10
         Section 7.3.  Valuation of the Fund..................................10
         Section 7.4.  Advice of Counsel......................................11
         Section 7.5.  Indemnification of Trustee and Affiliates..............11
         Section 7.6.  Indemnification of Successor Trustee...................12
         Section 7.7.  Compensation and Expenses..............................12

                                       -i-

<PAGE>


                                                                            Page
                                                                            ----

ARTICLE 8  ACCOUNTS AND REPORTS OF THE TRUSTEE................................13
         Section 8.1.  Records and Accounts of the Trustee....................13
         Section 8.2.  Accrual Basis for Accounts.............................13
         Section 8.3.  Fiscal Year............................................13
         Section 8.4.  Annual Report..........................................13
         Section 8.5.  Approval of Reports....................................13

ARTICLE 9  REMOVAL, RESIGNATION AND SUCCESSION OF THE TRUSTEE.................14
         Section 9.1.  Removal................................................14
         Section 9.2.  Resignation............................................14
         Section 9.3.  Appointment, Qualifications and Powers of Successor
                         Trustee..............................................14
         Section 9.4.  Changes in Organization of Corporate Trustee...........14

ARTICLE 10  AMENDMENT OR TERMINATION..........................................15
         Section 10.1.  Authority to Amend or Terminate.......................15
         Section 10.2.  Method of Making Amendment............................15
         Section 10.3.  Termination of Trust..................................15
         Section 10.4.  Diversion of Fund Prohibited..........................15

ARTICLE 11  CONTINUANCE BY A SUCCESSOR........................................16

ARTICLE 12  PARTICIPATING EMPLOYERS...........................................16
         Section 12.1.  Participating Employers Become Parties to Trust.......16
         Section 12.2.  Company Appointed Agent by Participating Employers....16
         Section 12.3.  Segregation of Fund...................................16

ARTICLE 13  CONTROLLING LAW AND LEGAL ACTIONS.................................17
         Section 13.1.  Controlling Law.......................................17
         Section 13.2.  Legal Actions.........................................17

ARTICLE 14  MISCELLANEOUS.....................................................17
         Section 14.1.  Protection of Persons Dealing with Trustee............17
         Section 14.2.  Tax Exemption of Trust................................17
         Section 14.3.  No Interest in Participating Employer Given by Trust..17
         Section 14.4.  Gender and Plurals....................................18

ARTICLE 15  EXECUTION.........................................................18



                                      -ii-

<PAGE>



                         AERIAL OPERATING COMPANY, INC.

                           TAX-DEFERRED SAVINGS TRUST


                  THIS  AGREEMENT  made as of November 22, 1999,  between Aerial
Operating Company,  Inc., a corporation organized under the laws of the State of
Delaware (the "Company"),  CTC Illinois Trust Company,  a corporation  organized
under the laws of the State of  Illinois  and  authorized  to accept and execute
trusts (the "Trustee") and The Bank of New York, a New York Banking  Corporation
("BNY").

                  WHEREAS,  the Company has  adopted  and  maintains  the Aerial
Operating Company,  Inc.  Tax-Deferred Savings Plan (the "Plan") for the benefit
of certain  of its  employees  and their  beneficiaries  and for the  benefit of
certain employees of other employers and the beneficiaries of such employees;

                  WHEREAS,  the Plan is intended to satisfy the  requirements of
Sections 401(a) and 401(k) of the Internal Revenue Code of 1986, as amended (the
"Code"),  and to meet  all  other  applicable  requirements  of the Code and all
applicable  requirements of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA");

                  WHEREAS,  the Company  desires to enter into a trust agreement
pursuant  to  which a trust  will be  established  and  maintained  for the sole
purpose of the Company and participating employers funding the benefits provided
under the terms of the Plan;

                  WHEREAS,  the Company  desires that the assets of the trust be
held in trust  pursuant to the terms of this trust  agreement for the benefit of
the  participants  and  beneficiaries  under the Plan,  effective as of the date
hereof;

                  WHEREAS,  the Company  desires to appoint CTC  Illinois  Trust
Company as Trustee, effective as of the date hereof; and

                  WHEREAS,  CTC  Illinois  Trust  Company  desires  to  serve as
Trustee pursuant to the terms of this trust agreement,  effective as of the date
hereof.

                  NOW,  THEREFORE,  in  consideration of the premises and of the
mutual covenants herein  contained,  the Company and the Trustee do hereby agree
as follows:


                                       -1-

<PAGE>



                                    ARTICLE 1
                                    ---------
                             TRUST, FUND AND TRUSTEE
                             -----------------------
                  Section 1.1.  Trust.  This instrument and the trust evidenced
hereby, as amended from time to time, shall be known as the Aerial Operating
Company, Inc. Tax-Deferred Savings Trust (the "Trust").

                  Section  1.2.  Fund.  The  assets  held under the Trust by the
Trustee  are  herein  referred  to as the  "Fund."  Except as  herein  otherwise
provided,  title to  assets  of the Fund  shall at all  times be  vested  in the
Trustee,  subject to the right of the Trustee to hold title in bearer form or in
the name of a nominee or  nominees,  and the interest of others in the assets of
the Fund shall be only the right to have such assets received,  held,  invested,
administered and distributed in accordance with the provisions of the Trust.

                  Section 1.3.  Trustee and its Agents.  (a) The Trustee and its
duly appointed  agents,  including but not limited to BNY, shall receive,  hold,
invest,  administer and distribute the Fund in accordance with the provisions of
the Trust and for the exclusive purpose of providing benefits to participants in
the  Plan  and  their   beneficiaries  and  defraying   reasonable  expenses  of
administering the Plan.

                  (b) Without limiting the generality of the foregoing paragraph
1.3(a) or any other power of the Trustee,  BNY or any other agent of the Trustee
as  provided  for in this  trust  agreement,  the  Company  hereby  specifically
authorizes  that  any  of  the  Trustee's   powers,   duties,   obligations  and
responsibilities  under this trust agreement may be performed or assumed, to the
extent determined by the Trustee in its sole and absolute discretion and without
any further notice to the Company, by BNY or any successor thereto.  The Company
agrees  to be  bound  by all  actions  taken by BNY  pursuant  to the  preceding
sentence  to the same extent as if they were taken by the  Trustee.  The Company
further agrees that BNY shall be entitled to all of the protections  accorded to
the Trustee under this trust agreement, including but not limited to any and all
releases  from  liability  and  indemnities   contained  herein,  and  that  the
performance of any action by BNY shall not enlarge the  responsibilities  of BNY
under this trust agreement beyond the  responsibilities of the Trustee.  Without
limiting the generality of the foregoing, BNY may perform investment management,
custodial  functions,  settlement of  securities  transactions,  valuations  and
accountings.  If so  advised  in  writing  by  the  Trustee,  the  Company,  the
Investment  Management  Committee,  any Participating  Company or any investment
manager shall provide  investment  directions and other directions to BNY rather
than to the Trustee.


                                       -2-

<PAGE>



                                    ARTICLE 2
                                    ---------
                                      PLANS
                                      -----
                  Section 2.1.  Delivery of Plan to Trustee.  The Company  shall
deliver  to the  Trustee  a  certified  copy of the Plan  and of each  amendment
thereto for convenience of reference, but the rights, powers, titles, duties and
discretions  of the  Trustee  shall be  governed  solely  by the  Trust  without
reference to the Plan.

                  Section 2.2. Participating  Employers. The term "Participating
Employers" wherever used herein shall mean the Company and any other corporation
which  has  adopted  the Plan and has  become a party to the Trust  pursuant  to
Section 12.1.

                                    ARTICLE 3
                                    ---------
                       AUTHORIZED EMPLOYER REPRESENTATIVES
                       -----------------------------------
                  The   Company  on  its  own  behalf  and  as  agent  for  each
Participating  Employer  shall  furnish  the  Trustee  the  names  and  specimen
signatures  of each person upon whose  statement of the decision or direction of
the  Company  or  the  Participating  Employers  or  the  Investment  Management
Committee  (as  defined  in Section  6.2) the  Trustee  is  authorized  to rely.
Specifically,  the Company  shall  certify to the Trustee the name of any agent,
including without limitation any third party  administrator (an  "Administrative
Agent"),   appointed  by  the  Company  to  receive,  cumulate  and  communicate
investment, distribution and administration directions for the Plan, and to whom
the Company has delegated such responsibility and authority as the Company shall
communicate  to the Trustee.  The Trustee shall be fully  protected in acting in
accordance  with any such  statement,  decision or direction which it reasonably
believes to be genuine, and which reasonably purports to be signed in accordance
with this Section. Until notified of a change in the identity of such persons or
agents the Trustee shall act upon the assumption that there has been no change.

                                    ARTICLE 4
                                    ---------
                                  CONTRIBUTIONS
                                  -------------
                  All  contributions  made under the Plan shall be  delivered to
the Trustee. The Trustee shall be accountable for all contributions  received by
it but shall have no duty to require  any  contributions  to be made to it or to
determine  that  the  contributions  received  comply  with the Plan or with the
resolutions of the board of directors of the Participating  Employers  providing
therefor  or to  ensure  that the Fund is  adequate  to meet and  discharge  any
liabilities under the Plan.


                                       -3-

<PAGE>



                                    ARTICLE 5
                                    ---------
                             DISTRIBUTIONS FROM FUND
                             -----------------------
                  Section 5.1. Company to Direct Distributions. Distributions in
cash or in kind shall be made from the Fund by the  Trustee  to such  persons or
other  entities  in such  manner,  at such times,  in such  amounts and for such
purposes  as the  Company  shall  direct in  writing,  and upon  receiving  such
directions,  the Trustee shall be  authorized  and empowered to sell or purchase
property held in the Fund as appropriate to effectuate such  distributions.  The
Trustee shall also  discontinue  distributions  from the Fund in accordance with
the  directions  of the Company.  The Trustee  shall have no  responsibility  as
Trustee  to see to the  application  of  distributions  so made or to  ascertain
whether the directions of the Company comply with the Plan.

                  The Trustee may maintain one or more interest bearing accounts
for the purpose of making distributions and such other purposes,  if any, as may
reasonably be required for the convenient  administration  of the Plan or of the
Trust. The Trustee is hereby directed to maintain any such account at BNY or one
of its  affiliates.  Distributions  of the Trust shall be made by wire transfer,
checks,  vouchers  or warrants  of the  Trustee or an  affiliate  of the Trustee
acting as agent of the Trustee. The parties acknowledge and agree that the Trust
shall  not be  credited  with  any  earnings  on the  amount  required  to  make
distributions until the check,  voucher or warrant is presented for payment. Any
such earnings  shall be retained by and constitute  compensation  to the Trustee
and its affiliates in addition to that listed in Exhibit A.

                  Section 5.2.  Withholding of Taxes.  The Trustee may withhold,
or require the withholding,  from any distribution  which it is directed to make
such sum as the Trustee may reasonably  estimate is necessary to cover any taxes
for which the Trustee may be liable which are, or may be,  assessed  with regard
to such  distribution.  Upon  discharge or  settlement of such tax liability the
Trustee  shall  distribute  the balance of such sum, if any, to the  distributee
from  whose  distribution  it was  withheld,  or if  such  distributee  is  then
deceased,  to such other person as the Company shall direct. Prior to making any
distribution  hereunder the Trustee may require such releases or other documents
from any taxing authority, or may require such indemnity and surety bond, as the
Trustee shall reasonably deem necessary for its protection.

                  Section  5.3.  Participant  Loans.  The  Company  as the named
fiduciary of the participant loan program, and any Administrative Agent shall be
exclusively  responsible for the administration of any participant loan program,
including responsibility for issuing and maintaining custody of promissory notes
and other  documentation  pertaining  to such loans,  and for all  related  loan
disclosure and record keeping matters. The Trustee shall make loan disbursements
to  participants  from the Fund pursuant to the directions of the Company or the
Administrative  Agent.  Loan repayments shall be collected by the Company or the
Administrative  Agent and  remitted  to the  Trustee,  which  shall  invest such
repayments among the available  investment funds in the proportions  directed by
the Company or the Administrative

                                       -4-

<PAGE>



Agent. The Company or the Administrative  Agent shall maintain and submit to the
Trustee the records, accounts and reports otherwise required of the Trustee with
respect to the  portion of the Trust held by the  Company or the  Administrative
Agent as promissory  notes,  and the Trustee shall  include the  information  so
provided in its  reports  and  accounts  furnished  by the  Trustee  pursuant to
Article 8 hereof.  The  Company or the  Administrative  Agent will  provide  the
Trustee  with  such  information  as may from time to time be  required  for the
Trustee to  exercise  its rights  under the  documents  relating  to Plan loans,
including   without   limitation,   the  occurrence  of  events  of  default  by
participants.  The  Trustee  shall not be liable  for any  actions  taken by the
Company or the Administrative Agent under this Section 5.3.

                  Section 5.4. Interests Non-Assignable. No right or interest of
any participant or distributee to receive  distributions  from the Fund shall be
assignable or transferable in whole or in part,  either directly or by operation
of law or otherwise,  including, but not by way of limitation,  execution, levy,
garnishment, attachment, pledge or bankruptcy, but excluding devolution by death
or mental incompetency,  and no right or interest of any participant of the Plan
or other distributee to receive distributions from the Fund shall be liable for,
or subject to, any obligation or liability of such  participant or  distributee,
including  claims for alimony or the support of any spouse  other than as may be
required by a qualified  domestic  relations  order which is  determined to be a
qualified  domestic relations order by the Company within the meaning of Section
414(p) of the Code.

                                    ARTICLE 6
                                    ---------
                               INVESTMENT OF FUND
                               ------------------
                  Section 6.1.  Investments  Authorized.  Except as otherwise in
the Trust provided,  the net income of the Fund shall be  accumulated,  added to
the  principal  of the Fund and invested  and  reinvested  therewith as a single
Fund.  Subject to the  provisions  of Section 6.2, the Trustee is  authorized to
invest the Fund in such preferred or common stocks, bonds, notes, and debentures
(including  convertible  stocks  and  securities),  mortgages,  equipment  trust
certificates,  investment trust certificates, shares of investment companies and
mutual funds  (irrespective of whether the Trustee or BNY is performing services
therefor),   interests  in  partnerships  and  trusts,   insurance  policies  or
contracts,  certificates of deposit and savings accounts which bear a reasonable
rate of interest,  including  certificates  and  accounts  issued by or with the
Trustee's or BNY's  banking  department,  and common,  collective  or commingled
trust funds maintained by the Trustee,  BNY or any affiliate thereof,  or a duly
appointed  investment  manager for the investment of assets of employee  benefit
plans  qualified  under section 401(a) of the Code  (whereupon  the  instruments
establishing  such funds,  as amended,  shall be deemed a part of this Agreement
and  incorporated  by  reference  herein),  or in such other  property,  real or
personal, either within or without the United States, as the Trustee may deem to
be in the  interest  of the  participants  and  beneficiaries  of the Plan.  The
Trustee  in its  discretion  may hold  any  portion  of the Fund in an  interest
bearing  account  pending  investment or payment of expenses or  distribution of
benefits.


                                       -5-

<PAGE>



                  Section  6.2.  Individual  Investment  Direction.  The Company
shall  appoint a committee  consisting  of two or more members (the  "Investment
Management  Committee") to direct the Trustee with respect to the investment and
reinvestment  of all or any  designated  portion,  as solely  determined  by the
Company,  of the Fund. The  Investment  Management  Committee  shall be a "named
fiduciary"  of the  Plan  within  the  meaning  of such  term as used in  ERISA.
Pursuant to Section 5.8 of the Plan, the Investment Management Committee and the
Trustee shall  establish and maintain for the  investment  and  reinvestment  of
contributions  made on behalf of participants in the Plan ("Plan  Participants")
separate  investment  funds,  as may be designated by the Investment  Management
Committee from time to time ("Designated  Funds"),  having different  investment
characteristics  and  objectives  in order to provide Plan  Participants  with a
variety of investment  alternatives  in accordance  with Section 404(c) of ERISA
and the regulations  thereunder.  Such Designated Funds may be invested in whole
or in part in common stock of a  Participating  Employer or common or collective
investment  funds  maintained  by the Trustee or others  (such as, for  example,
common  or  collective  funds  maintained  by  banks  and  trust  companies  for
investment of the assets of employee benefit trusts, mutual funds and the like).
The net income and proceeds of each Designated Fund shall be accumulated,  added
to the principal of such Designated  Fund, and reinvested  therewith as a single
fund. Each Plan Participant  shall give the Investment  Management  Committee or
the  Administrative  Agent  directions in the manner required by the Company and
the Plan as to the amount, if any, of each contribution to the Fund which should
be invested in each Designated Fund and as to the amount to be transferred  from
time to time from one such  Designated  Fund to  another.  Pursuant to each Plan
Participant's   directions,   the   Investment   Management   Committee  or  the
Administrative  Agent shall direct the Trustee with respect to the allocation of
assets to Designated Funds and with respect to the transfer of assets among such
Designated  Funds  and upon  receiving  such  direction,  the  Trustee  shall be
authorized  and  empowered  to  sell  or  purchase  any  property  held  in such
Designated  Funds as appropriate to effectuate  such transfers  pursuant to this
Section. To the extent so directed, the Company, Investment Management Committee
and the Trustee are relieved of their fiduciary  responsibilities as provided in
Section 404(c) of ERISA. In the event any Plan  Participant  fails to direct the
investment of any contribution as provided herein, the Trustee shall invest such
contribution  in accordance with the  instructions of the Investment  Management
Committee.  The Investment  Management  Committee shall direct the investment of
cash balances held in the Fund from time to time in short-term cash  equivalents
including,  but not  limited  to,  units in the  Trustee's  or BNY's  short term
collective  investment  fund if  otherwise  permitted by the terms of the Trust,
U.S. Treasury Bills,  commercial paper (including such forms of commercial paper
as  may  be  available  through  the  Trustee's  or  BNY's  Trust   Department),
certificates  of deposit,  and similar type  securities,  with a maturity not to
exceed  one year.  Notwithstanding  the  foregoing,  the  Investment  Management
Committee  may by  separate  written  agreement  delegate  to  BNY or any  other
investment  manager  authority  to  direct  the  investment,  in the  investment
manager's sole discretion,  of all or a portion of the cash balances held in the
Fund in any of the short term cash equivalents listed in the prior sentence. The
Trustee shall sell any such short-term  investments as may be necessary to carry
out the  instructions  of the Investment  Management  Committee or an investment
manager regarding investments and

                                       -6-

<PAGE>



directed  distributions.  It shall be the duty of the Trustee to act strictly in
accordance  with any direction  given by the  Administrative  Agent,  Investment
Management Committee or investment manager pursuant to this Section. The Trustee
shall be under no duty to question any such direction,  to review any securities
or other  property held in the Fund pursuant to any such  direction,  or to make
suggestions to the  Administrative  Agent,  Investment  Management  Committee or
investment  manager  in  connection  therewith.  The  Trustee  shall be under no
liability  for any loss of any kind  which may result by reason of any action by
it in accordance with any direction of an  Administrative  Agent, the Investment
Management  Committee  or an  investment  manager or by reason of the  Trustee's
failure  to take any  investment  action in the  absence of  directions  from an
Administrative  Agent,  the  Investment  Management  Committee or an  investment
manager with respect to such portion of the Trust. Notwithstanding any provision
of the  Trust to the  contrary,  the  Trustee  shall be  indemnified  and  saved
harmless by the  Participating  Employers  from and against any and all personal
liability to which the Trustee may be  subjected by carrying out any  directions
of an Administrative Agent, the Investment Management Committee or an investment
manager issued  pursuant to this Section or for failure to act in the absence of
directions of an Administrative Agent, the Investment Management Committee or an
investment manager including all expenses  reasonably incurred in its defense in
the event the  Participating  Employers fail to provide such defense;  provided,
however,  the Trustee shall not be so indemnified if it  participates  knowingly
in, or knowingly  undertakes to conceal, an act or omission of an Administrative
Agent,  the Investment  Management  Committee or an investment  manager,  having
actual  knowledge that such act or omission is a breach of a fiduciary duty; and
further  provided,  however,  that  the  Trustee  shall  not be  deemed  to have
knowingly  participated in or knowingly undertaken to conceal an act or omission
of an Administrative Agent, the Investment Management Committee or an investment
manager with  knowledge that such act or omission was a breach of fiduciary duty
by merely complying with directions of an  Administrative  Agent, the Investment
Management  Committee  or an  investment  manager,  or for failure to act in the
absence of any such directions,  or by reason of maintaining accounting records.
The Trustee may rely upon any order,  certificate,  notice,  direction  or other
documentary confirmation reasonably purporting to be issued by an Administrative
Agent, the Investment  Management  Committee or an investment  manager which the
Trustee  reasonably  believes  to be  genuine  and to have  been  issued by such
Administrative Agent, Investment Management Committee or investment manager.

                  Section 6.3.  Investment in Commingled Trust.  Notwithstanding
any other provision of the Trust, the Trustee at the direction of the Investment
Management  Committee  may cause any part or all of such assets to be commingled
with the assets of other trusts by  investment  as a part of any group trust and
as a part of any one or more of the Funds into  which such group  trust may from
time to time be divided,  and the assets so invested  shall be subject to all of
the  provisions of such group trust,  as it may be amended from time to time. To
the extent that  property of the Fund is invested in any such group  trust,  the
declaration of trust pertaining  thereto,  as amended from time to time, and the
trust thereby  created,  shall be a part of this  Agreement and of the Plan. The
Trustee shall have, with respect to the interest of the Fund in

                                       -7-

<PAGE>



such group trust, the powers conferred by this Agreement to the extent that such
powers are not  inconsistent  with the provisions of such  declaration of trust.
The  Trustee  shall have no  responsibility  for the custody or  safekeeping  of
assets transferred to a group trust pursuant to this Section.

                  Section 6.4. Registration of Company Securities.  In the event
that the property  initially  delivered to the Trustee hereunder includes shares
of stock or other securities of a Participating  Employer,  or any subsidiary or
affiliate thereof,  or the Investment  Management  Committee or a duly appointed
investment  manager  directs the purchase of any such  securities and thereafter
directs the Trustee to dispose of any such securities, it shall be the Company's
ultimate  responsibility to ensure that such securities are properly  registered
under the  Securities  Act of 1933 and are qualified  under the Blue Sky laws of
any state or states.  The  Trustee  shall be fully  protected  in relying on the
Company's representation that (a) any such registration and/or qualification has
been  effected  and (b) with respect to such  securities,  the Company has fully
complied  with all  relevant  federal  and  state  securities  laws,  rules  and
regulations.

                                    ARTICLE 7
                                    ---------
                          POWERS AND RIGHTS OF TRUSTEE
                          ----------------------------
                  Section 7.1.  Trustee's  Powers.  Subject to the provisions of
Articles 6 and 7, the Trustee shall have the following powers, rights and duties
in addition to those vested in them elsewhere in the Trust or by law:

                  (A) to retain,  manage,  improve,  repair, operate and control
         any asset of the Fund;

                  (B) to sell, convey, transfer,  exchange,  partition, grant or
         acquire  options  with respect to, lease for any term (even though such
         term  extends  beyond the  duration of this Trust or  commences  in the
         future),  mortgage,  pledge,  or otherwise  deal with or dispose of any
         asset of the Fund in such manner,  for such consideration and upon such
         terms  and  conditions  as  the  Trustee,  in  its  discretion,   shall
         determine;

                  (C) to employ such counsel,  agents, including but not limited
         to BNY and  auditors,  as may be  reasonably  necessary in  collecting,
         managing,  administering,  investing,  distributing  and protecting the
         Fund or the assets thereof and to pay them reasonable compensation;

                  (D) to settle, compromise or abandon all claims and demands in
         favor of or against the Fund;


                                       -8-

<PAGE>



                  (E) to organize,  incorporate or create (or participate in the
         organization,  incorporation  or  creation  of),  under the laws of any
         state,  a corporation or trust for the purpose of acquiring and holding
         title to any property  which the Trustee is  authorized  to acquire for
         the Fund and to exercise with respect thereto any of the powers, rights
         and duties it has with respect to other assets of the Fund;

                  (F) to  cause  any  asset of the  Fund to be  issued,  held or
         registered in the name of its nominee,  or in such form that title will
         pass by delivery,  provided the records of the Trustee  shall  indicate
         the true  ownership  of such asset (and the Company  agrees to hold the
         Trustee and BNY, individually and as agent for the Trustee, and each of
         their directors,  officers and employees, and any such nominee harmless
         from any liability as the holder of record);

                  (G) to  purchase,  sell  and/or  hold  shares  of stock of any
         Participating Employer;  provided,  however, that shares purchased from
         or sold to a  Participating  Employer  shall be  purchased  or sold for
         adequate  consideration  within the  meaning of section  3(18) of ERISA
         (which  shall  mean the  closing  price for such  shares on the AMEX or
         Nasdaq  National  Market,  whichever  is  applicable  for the  last day
         preceding  the date of purchase or sale),  and no  commission  shall be
         charged  or  paid  with  respect  to  purchases  from  or  sales  to  a
         Participating Employer;

                  (H) to make,  execute,  acknowledge  and  deliver  any and all
         documents of transfer and conveyance and any and all other  instruments
         that may be necessary or  appropriate  to carry out the powers  granted
         herein;

                  (I) to  collect  all  interest,  dividends  and  other  income
         payable  with  respect  to  property  in the  Fund,  and  to  surrender
         securities  at  maturity  or  when  advised  of  an  earlier  call  for
         redemption,  provided  that the Trustee shall not be liable for failure
         to  surrender  any  security  for  redemption  prior to maturity if the
         Trustee did not have actual notice of such redemption;

                  (J) to exchange securities in temporary form for securities in
         definitive  form,  and to effect an  exchange  of shares  where the par
         value of stock is changed;

                  (K) to hold property in its vaults, in  non-certificated  form
         with the issuer,  on Federal Book Entry at the Federal  Reserve Bank of
         New York, with a custodian  appointed  pursuant to clause (L) below, or
         at any other location approved by the Investment Management Committee;

                  (L) to appoint BNY to act as custodian with respect to any
         portion of the Fund;


                                       -9-

<PAGE>



                  (M) to delegate to any of the Trustee's affiliates such powers
         and  duties as the  Trustee  considers  desirable,  provided  that such
         delegation, and the acceptance thereof by such affiliates,  shall be in
         writing; and

                  (N) to exercise any of the powers and rights of an  individual
         owner with respect to any property of the Fund and to do all other acts
         which  in its  judgment  are  necessary  or  desirable  for the  proper
         administration of the Fund,  although such powers,  rights and acts are
         not specifically enumerated in the Trust.

                  The Trustee shall  discharge its duties solely in the interest
of participants of the Plan and their  beneficiaries  and with the care,  skill,
prudence,  and diligence under the circumstances  then prevailing that a prudent
man acting in a like  capacity and familiar  with such matters  would use in the
conduct of an enterprise of a like character with like aims.

                  Section 7.2. Restrictions on Power to Vote and Related Rights.
Pursuant to, and only with, the specific direction of the Investment  Management
Committee,  the Trustee shall (i) vote any corporate stock or mutual fund shares
either in person or by proxy for any  purposes;  (ii)  exercise  any  conversion
privilege,  subscription right or any other right or option given to the Trustee
as the owner of record of any  security  owned by the Fund and make any payments
incidental  thereto;  and (iii) consent to, take any action in connection  with,
and  receive  and  retain  any  securities  resulting  from any  reorganization,
consolidation,  merger,  readjustment of the financial structure, sale, lease or
other  disposition of the assets of any corporation or other  organization,  the
securities of which may be an asset of the Fund.  Notwithstanding  the foregoing
provisions  of this  Section  7.2,  the Trustee  shall pass through to each Plan
Participant  by proxy or  otherwise,  the right to vote and  exercise all of the
other powers and rights described in the preceding  sentence with respect to (A)
the Common Shares, par value $1.00 per share, of Aerial Communications, Inc. (B)
the Common  Shares,  par value $1.00 per share,  of Telephone  and Data Systems,
Inc.,  and (c) the Common  Shares,  par value $1.00 per share,  of United States
Cellular Corporation,  (all of such Common Shares being collectively referred to
herein as "Employer  Common  Shares")  represented  in or allocated to such Plan
Participant's  Salary  Reduction  Contributions  Account  or  Rollover  Account;
provided however,  that if any Plan Participant does not instruct the Trustee or
otherwise  exercise his right to vote and other  related  rights and powers in a
timely manner,  the Trustee shall exercise such rights and powers as directed by
the Investment Management Committee, which shall act in the best interest of the
Plan Participant.  In any event, the right to vote and exercise all of the other
powers and rights  described  in this  Section 7.2 with  respect to the Employer
Common Shares represented in or allocated to the Employer Matching Account shall
be exercised by the Trustee pursuant to, and only with the specific direction of
the Investment Management Committee.

                  Section 7.3. Valuation of the Fund. As of the inception of the
Fund  and at such  other  times as may be  agreed  upon by the  Trustee  and the
Investment  Management  Committee  (the  "Valuation  Date"),  the Trustee  shall
determine the market value of the Fund and of the

                                      -10-

<PAGE>



interests of the various  Participating Plans therein. Such determination may be
made either by the Trustee  itself or by such person or persons  believed by the
Trustee to be  competent to make such  determination  as the Trustee may select,
but in accordance with a method consistently followed and uniformly applied. The
Trustee's  determination  of the value of the Fund and of the  interest  of each
Participating   Plan  therein   shall  be   conclusive   and  binding  upon  all
Participating Plans and all participating  Employers,  the Investment Management
Committee and the Participants in such Plans and their beneficiaries;  provided,
however,  that in the event  the  Company  or  Investment  Management  Committee
objects  to the  Trustee's  determination  of the  value  of the Fund and of the
interest of each  Participating Plan therein,  such  determination  shall not be
conclusive and binding until the Trustee,  in good faith,  has fully  considered
and  evaluated  the Company's or  Investment  Management  Committee's  objection
thereto and any reasons for or evidence supporting such objection.

                  The interest of each  Participating  Plan shall be represented
by whole and  fractional  units which shall be undivided  interests in such Fund
without  priority  or  preference  one  over the  other.  The  original  unit of
participation  upon  establishment of this Trust shall be $1,000,  or such other
amount as the Trustee may determine at that time. As of any Valuation  Date, the
Trustee may make a uniform  change in the size of all  outstanding  units of the
Fund, by creating  either a larger number of small units or a smaller  number of
large units. As of each Valuation Date the Trustee shall determine the value per
unit in the Fund by dividing the value of the Fund as  determined  in accordance
with this Section by the number of existing units in the Fund. Transfers of cash
and/or  property to or from the separate  accounts of the various  Participating
Plans  shall be made only as of a  Valuation  Date and  shall be based  upon the
value of a unit as of such Date,  and the number of units charged or credited to
the accounts of such Plans shall be adjusted accordingly.

                  To the extent that the Trustee  shall be required to value the
assets of the Fund for any purpose,  including without  limitation any valuation
pursuant  to  this  Section,  for  accounting  pursuant  to  Article  8 and  any
segregation of assets pursuant to Section 12.3 hereof,  the Trustee may rely for
all purposes of this  Agreement  upon any  certified  appraisal or other form of
valuation submitted to it by any investment manager,  the Investment  Management
Committee and, with respect to an interest in any venture capital  organization,
the manager of such organization.

                  Section 7.4.  Advice of Counsel.  The Trustee may consult with
legal counsel, who may be counsel for any Participating Employer, in respect of
any of its rights, duties or obligations hereunder.

                  Section 7.5.  Indemnification  of Trustee and Affiliates.  The
Trustee,  individually  and as trustee under this  Agreement,  and the Trustee's
directors,  officers and  employees,  and those  affiliates  (including  but not
limited to BNY) to whom the Trustee has delegated any  responsibility  hereunder
shall be indemnified and saved harmless by the Participating Employers

                                      -11-

<PAGE>



from and against any and all claims,  loss,  damages,  expenses and liability to
which they may be subjected by reason of any act reasonably  taken or omitted in
good faith with respect to the Fund,  including all expenses reasonably incurred
in their  defense  in case the  Participating  Employers  fail to  provide  such
defense, provided such action or omission does not constitute a violation of the
fiduciary  responsibilities under part 4 of Title I of ERISA of the Trustee, the
Trustee's  directors,  officers or  employees  or those  affiliates  to whom the
Trustee has delegated any responsibility.

                  Notwithstanding  the  foregoing,  nothing in this Agreement is
intended to or shall be  construed  to relieve  the  Trustee  and the  Trustee's
directors,  officers and employees, and those affiliates to whom the Trustee has
delegated any responsibility hereunder from any responsibility or liability they
may have under  part 4 of Title I of ERISA,  or from any  liability  of any kind
arising as a result of their  negligence  or willful  misconduct.  Additionally,
except as may be  required  under  ERISA,  in no event  shall the Trustee or BNY
individually,  as  trustee  or as  agent  for  the  Trustee,  nor  any of  their
respective directors,  officers,  employees or affiliates to whom the Trustee or
BNY has delegated any responsibilities  under this trust agreement be liable for
any claim, loss, damages,  expenses or liability caused by circumstances  beyond
its or their control, or for special, punitive or consequential damages.

                  Section  7.6.  Indemnification  of Successor  Trustee.  If the
Trustee is acting as a successor trustee,  the Company hereby agrees to hold the
Trustee and any  affiliates to which it has delegated  responsibility  hereunder
harmless from and against any tax, claim,  liability,  loss,  damage, or expense
incurred by or  assessed  against it as such  successor  as a direct or indirect
result of any act or  omission  of a  predecessor  trustee  or any other  person
charged under any agreement affecting Fund assets with investment responsibility
with respect to such assets.

                  Section 7.7.  Compensation and Expenses.  The Trustee shall be
entitled to the compensation  set forth in Exhibit A attached hereto,  which may
be amended from time to time by the Trustee by written notice of amendment. Such
an amendment  shall become  effective on the 60th day after the Trustee mails it
to the Company  unless the Company  shall have provided the Trustee with written
notice of objection thereto.  The Trustee is authorized and directed to pay from
the Fund all costs and expenses approved by the Company (which approval must not
be unreasonably  delayed or withheld) and incurred in administering the Plan and
the Fund,  including  without  limitation the  compensation  and expenses of the
Trustee,  the fees of counsel for the Trustee,  all brokerage costs and transfer
taxes incurred in connection  with the investment and  reinvestment of the Fund,
all income taxes or other taxes of any kind which may be levied or assessed upon
or in respect of the Fund and any other  administrative  expenses  to the extent
such  expenses  are not paid by the  Participating  Employers.  The  Trustee  is
authorized,  when so directed by the Company, to pay from the Fund any specified
expenses of administration of the Plan.


                                      -12-

<PAGE>



                                    ARTICLE 8
                                    ---------
                       ACCOUNTS AND REPORTS OF THE TRUSTEE
                       -----------------------------------
                  Section 8.1. Records and Accounts of the Trustee.  The Trustee
shall  maintain   accurate  and  detailed  records  and  keep  accounts  of  all
transactions  of the Trust and make them available at all  reasonable  times for
inspection or audit by any person designated by the Company. At the direction of
the Company  the Trustee  shall  submit to the  auditors  for the Company and to
others  designated by the Company such valuations,  reports or other information
as they may reasonably require.

                  Section 8.2.  Accrual Basis for Accounts.  All accounts of the
Trustee shall be kept on an accrual basis.

                  Section 8.3.  Fiscal Year.  The fiscal year of the Trust shall
be the calendar year.

                  Section 8.4. Annual Report.  Within 45 days after the close of
each  fiscal  year of the Trust  (or such  other  date as may be agreed  upon in
writing  between  the  Company  and the  Trustee)  and  within 60 days after the
effective date of the removal or  resignation of any Trustee,  the Trustee shall
file with the  Company a written  report  setting  forth all  transactions  with
respect to the Fund  during such fiscal year or during the period from the close
of the last fiscal year to the date of such removal or  resignation  and listing
the  assets  of the Fund and the  market  value  thereof  as of the close of the
period covered by such report.

                  Section  8.5.  Approval  of  Reports.  Upon the receipt by the
Trustee  of the  Company's  written  approval  of any such  report,  or upon the
expiration  of three  months  after  delivery of any such report to the Company,
such report (as originally  stated if no objection has been theretofore filed by
the Company,  or as therefore adjusted pursuant to agreement between the Company
and the  Trustee)  shall be deemed to be approved  by the  Company  except as to
matters,  if any,  covered by written  objections  theretofore  delivered to the
Trustee by the Company  regarding which the Trustee has not given an explanation
or made  adjustments  satisfactory  to the  Company,  and the  Trustee  shall be
released and  discharged  as to all items,  matters and things set forth in such
report  which are not covered by such written  objections  as if such report has
been  settled and allowed by a decree of a court having  jurisdiction  regarding
such report and of the Trustee and the  Participating  Employers.  The  Trustee,
nevertheless,  shall have the right to have its accounts and reports  settled by
judicial proceedings if it so elects, in which event the Company and the Trustee
shall be the only  necessary  parties  (although  the Trustee may also join such
other parties as it may deem appropriate).


                                      -13-

<PAGE>



                                    ARTICLE 9
                                    ---------
               REMOVAL, RESIGNATION AND SUCCESSION OF THE TRUSTEE
               --------------------------------------------------
                  Section 9.1. Removal.  The Company, by resolution of its board
of directors, may remove a Trustee at any time, such removal to take effect upon
the later of the 60th day after the Trustee  receives notice from the Company of
such removal and the effective date of the appointment of a successor Trustee as
hereinafter provided.

                  Section 9.2. Resignation. Any Trustee may resign by delivering
to the Company a written  resignation to take effect upon the 60th day after the
delivery  thereof to the Company or upon such earlier date as may be  acceptable
to the Company.

                  Section  9.3.   Appointment,   Qualifications  and  Powers  of
Successor  Trustee.  The Company may appoint additional or successor Trustees at
any time by  resolution of its board of directors,  such  appointment  to become
effective  upon the  delivery  to any  Trustee  then in office of a copy of such
resolution certified by an officer of the Company and upon written acceptance of
the Trust by the  additional or successor  Trustee so  appointed,  or such other
date agreed to by the Company and the  additional  or  successor  Trustee.  Each
additional  or  successor  Trustee  shall have all the rights,  powers,  titles,
discretions,  duties and  immunities  given to, or  acquired  by,  the  original
Trustee. The legal title to the assets of the Fund shall be and remain vested in
the  Trustee  from  time  to time  acting  hereunder  without  any  transfer  or
conveyance  to, by, or from any  succeeding  or retiring  Trustee.  No successor
Trustee  shall be liable for the acts or omissions of any prior Trustee or shall
be  obliged to examine  the  accounts,  words,  acts or  omissions  of any prior
Trustee.

                  Section 9.4. Changes in Organization of Corporate Trustee.  In
the event that any  corporate  Trustee  at any time  acting  hereunder  shall be
converted  into,  shall  merge or  consolidate  with,  or shall sell or transfer
substantially all of its assets and business to, another  corporation,  state or
federal,   the   corporation   resulting   from  such   conversion,   merger  or
consolidation,  or the corporation to which such sale or transfer shall be made,
shall  thereupon  become and be a Trustee  of the Trust with the same  effect as
though specifically so named.


                                      -14-

<PAGE>



                                   ARTICLE 10
                                   ----------
                            AMENDMENT OR TERMINATION
                            ------------------------
                  Section 10.1. Authority to Amend or Terminate.  Subject to the
provisions  of Section  10.4,  the Company  shall have the right at any time and
from time to time to amend the Trust in any manner,  in whole or in part,  or to
terminate  the Trust,  provided  that no amendment  which  changes the duties or
liabilities of the Trustee shall be made without its written consent.

                  Section 10.2.  Method of Making  Amendment.  Each amendment of
the Trust  shall be made by  delivery  to the  Trustee  of a written  instrument
setting  forth such  amendment  duly  executed  by the Company  together  with a
certified  copy  of a  resolution  of the  board  of  directors  of the  Company
authorizing the execution of such written  instrument.  Such written  instrument
(with the consent of the Trustee endorsed thereon,  if its duties or liabilities
are changed thereby) shall constitute the instrument of amendment.

                  Section 10.3.  Termination of Trust.  Termination of the Trust
shall be  effected  by  resolution  of the board of  directors  of the  Company.
Written  notice of such  termination,  together  with a  certified  copy of such
resolution,  shall be delivered to the Trustee, and the Trustee shall dispose of
the Fund in the manner  directed in writing by the Company or, in the absence of
directions from the Company,  in such manner as may be directed by a judgment or
decree of a court of competent jurisdiction. The powers of the Trustee hereunder
shall continue as long as any assets of the Fund shall remain in its hands.

                  Section 10.4.  Diversion of Fund  Prohibited.  Subject only to
the  provisions  of  Sections  5.5(b),  5.7 and 11.2 of the  Plan and any  other
provisions of the Plan to the extent  similar in purpose,  at no time (either by
operation,  amendment or  termination  of the Plan or the Trust,  or  otherwise)
shall any part of the Fund (other than such part as is required to pay taxes and
administration  expenses) be used for, or diverted to,  purposes  other than for
the  exclusive  benefit of  employees  of the  Participating  Employers or their
beneficiaries;  provided,  however, that nothing herein contained shall preclude
the  return to a  Participating  Employer  of any  contribution  if the  Company
determines  that such  return is  permitted  by  Section  403(c) of ERISA or any
successor legislation.


                                      -15-

<PAGE>



                                   ARTICLE 11
                                   ----------
                           CONTINUANCE BY A SUCCESSOR
                           --------------------------
                  In  the  event  that  any  Participating   Employer  shall  be
reorganized by way of merger, consolidation, transfer of assets or otherwise, so
that another  corporation  other than a Participating  Employer shall succeed to
all or  substantially  all  of  such  Participating  Employer's  business,  such
successor  corporation may be substituted for such  Participating  Employer as a
party to the Trust by executing an appropriate  supplemental  agreement with the
Trustee.

                                   ARTICLE 12
                                   ----------
                             PARTICIPATING EMPLOYERS
                             -----------------------
                  Section 12.1. Participating Employers Become Parties to Trust.
Any  corporation  which shall adopt the Plan pursuant to the terms thereof shall
become a party to the Trust by filing  with the  Company  and the Trustee a duly
executed instrument in the form hereto annexed as "Exhibit B." Moneys thereafter
remitted to the Trustee by or on behalf of such  Participating  Employer and its
employees and the income therefrom shall be held by the Trustee as a part of the
Fund.

                  Section  12.2.   Company   Appointed  Agent  by  Participating
Employers.  Each Participating  Employer which shall become a party to the Trust
pursuant  to  Article  11 or  Section  12.1 by so doing  shall be deemed to have
appointed  the Company its agent to exercise on its behalf all of the powers and
authorities  hereby  conferred  upon the  Company  by the  terms  of the  Trust,
including,  but not by way of  limitation,  the power to amend or terminate  the
Trust.  Such  Participating  Employer  agrees  that it  shall  be  bound  by the
decisions,  actions and  directions of the Company,  the  Investment  Management
Committee or a duly appointed  investment manager. The Trustee and any affiliate
to whom it has delegated any  responsibility  hereunder shall be fully protected
in relying upon such directions and subject to Section 12.3 herein,  shall in no
event  be  required  to  give  notice  to  or  otherwise   deal  with  any  such
Participating  Employer  except by  dealing  with the  Company  as agent to such
Participating  Employer. The authority of the Company to act as such agent shall
continue  unless  and until the  portion  of the Fund  held for the  benefit  of
employees of the particular  Participating  Employer and their  beneficiaries is
set aside in a separate trust as provided in Section 12.3.

                  Section 12.3. Segregation of Fund. Each Participating Employer
reserves  the right to cause the Trustee to set aside from the Fund such portion
of the Fund as the  Company  shall  determine  to be held for the benefit of the
employees of such  Participating  Employer  (such  Participating  Employer being
hereinafter  referred to as the "withdrawing  employer") and their beneficiaries
under the Plan. Any portion which is so segregated shall thereafter constitute a
separate  trust fund and shall be held upon a separate  trust  identical to that
hereby  established,  except that with respect  thereto this agreement  shall be
construed as if the withdrawing  employer were the only  participating  employer
named herein. Thereafter with respect to such separate trust

                                      -16-

<PAGE>



fund all powers and authority  herein  conferred  upon the Company shall devolve
upon the withdrawing employer.  Upon the request of a withdrawing employer,  the
Company  shall give  written  directions  to the  Trustee  with  respect to such
segregation, a copy of which shall be given to each Participating Employer which
shall then be a party to this Trust.  Such directions shall specify not only the
amount to be  segregated  but the  particular  assets of the Fund which shall be
used to  constitute  such  separate  trust fund.  The Trustee  shall follow such
directions of the Company which shall constitute a conclusive determination that
the amount and the assets so segregated represent the share which should be held
upon a  separate  trust for the  benefit  of the  employees  of the  withdrawing
employer  and their  beneficiaries  under the  Plan,  unless  one or more of the
Participating  Employers  shall file with the  Trustee and the Company a written
protest within 30 days after such directions are given to the Trustee.

                                   ARTICLE 13
                                   ----------
                        CONTROLLING LAW AND LEGAL ACTIONS
                        ---------------------------------
                  Section 13.1.  Controlling Law. To the extent not preempted by
ERISA, the Trust shall be construed,  enforced and administered according to the
substantive  laws  (and  not the  choice  of law  provisions)  of the  State  of
Illinois.  Except as otherwise  required by ERISA,  all  proceedings  under this
trust  agreement  shall be brought in courts  located in the City of Chicago and
the company hereby submits to the jurisdiction of such courts for such purposes.

                  Section  13.2.  Legal  Actions.  The  Company  shall  have the
authority  to  enforce  the  Trust on behalf  of any and all  persons  having or
claiming any interest in the Fund.  In any legal action or equitable  proceeding
pertaining   to  the  Trust  or  the  Fund  or  any  interest   therein  or  the
administration  thereof, or for instructions to the Trustee, the Company and the
Trustee shall be the only necessary parties.

                                   ARTICLE 14
                                   ----------
                                  MISCELLANEOUS
                                  -------------
                  Section 14.1.  Protection of Persons Dealing with Trustee.  No
person  dealing  with the  Trustee  shall be  required or entitled to see to the
application  of any  money  paid or  property  delivered  to the  Trustee  or to
determine  whether or not the Trustee is acting pursuant to authority granted to
it hereunder or to authorizations or directions herein required.

                  Section  14.2.  Tax  Exemption  of Trust.  The Trust is hereby
designated  as  constituting  a part of  plans  intended  to  qualify  and to be
tax-exempt  under section 401(a) and section  501(a) of the Code,  respectively.
Until advised otherwise,  the Trustee may conclusively  assume that the Trust is
so tax-exempt.

                  Section 14.3.  No Interest in Participating Employer Given by
Trust.  Neither the creation of the Trust nor anything contained in the Trust
shall be construed as giving any person

                                      -17-

<PAGE>



or employee of any Participating  Employer any equity or interest in the assets,
business,  or affairs of any Participating  Employer or any right to continue in
the employ of any Participating Employer.

                  Section 14.4. Gender and Plurals.  In the Trust,  words in the
masculine  gender shall include  masculine or feminine  gender,  and, unless the
context otherwise  requires,  words in the singular shall include the plural and
words in the plural shall include the singular.

                                   ARTICLE 15
                                   ----------
                                    EXECUTION
                                    ---------
                  The Trust may be executed in any number of counterparts,  each
of which shall be  considered  an  original,  and no other  counterpart  need be
produced.


                                      -18-

<PAGE>



                  IN WITNESS WHEREOF,  the Company,  the Trustee and The Bank of
New York have caused the Trust to be signed by their authorized  officers on the
date provided at the beginning of this Trust.

                                                AERIAL OPERATING COMPANY, INC.


                                                By /s/ Donald W. Warkentin
                                                   -----------------------
                                                   Title: President
                                                          ----------------



                                                 CTC ILLINOIS TRUST COMPANY


                                                 By /s/ Greg Anderson
                                                    ------------------------
                                                    Title: Managing Director
                                                           -----------------



                                                  THE BANK OF NEW YORK


                                                  By /s/ Brian Jirak
                                                     ----------------------
                                                     Title: Agent
                                                            ---------------







                              SIGNATURE PAGE OF THE
            AERIAL OPERATING COMPANY, INC. TAX-DEFERRED SAVINGS TRUST











<PAGE>



                                                                    EXHIBIT 23.1





                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference  in this  Post-Effective  Amendment  No.  1 to Form  S-8  Registration
Statement of Aerial Communications,  Inc., of our reports dated January 27, 1999
(except with respect to the matter discussed in Note 10, as to which the date is
March  15,  1999),   included  or   incorporated  by  reference  in  the  Aerial
Communications,  Inc. Form 10-K for the year ended December 31, 1998, and to all
references to our Firm included in this  Post-Effective  Amendment No. 1 to Form
S-8 Registration Statement.



                                                            ARTHUR ANDERSEN LLP





Chicago, Illinois
December 22, 1999




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