LOAN AGREEMENT


This Loan Agreement is entered into on this 14th day of July,
1995, by and between Devono Company Limited, a British Virgin
Islands corporation (the "Borrower"), and MasTec, Inc. , a
Delaware corporation with its principal place of business located
at 8600 N.W. 36th Street, 8th Floor, Miami, Florida 33166 (the
"Lender")

                           WITNESSETH:

WHEREAS, the Borrower owns all of the issued and outstanding
capital stock of Cempresa, S.A., an Ecuadorian corporation
("Cempresa");

WHEREAS, Cempresa owns 13,157,942 shares or approximately fifty-
two and six-tenths percent (52.6%) of the issued and outstanding
shares of the common stock of Consorcio Ecuatoriano de
Telecomunicaciones S.A. ("Conecell"), an Ecuadorian corporation
licensed to operate a mobile cellular telecommunications system
and an international teleport system in the Republic of Ecuador;

WHEREAS, the Borrower wishes to obtain a loan from the Lender; and

WHEREAS, the Lender is willing to provide a loan to the Borrower,
subject to the terms and conditions set forth in this Agreement;

NOW, THEREFORE, for and in consideration of the above premises,
the mutual covenants and agreements contained herein and other
good and valuable consideration, the receipt of which is hereby
acknowledged by the parties, the Borrower and the Lender agree as
follows:

                                ARTICLE I

                      DEFINITIONS AND ACCOUNTING TERMS

     Section 1.1   Defined Terms.  As used in this Agreement, the
     following terms have the following meanings (terms defined in the
     singular shall have the same meaning when used in the plural and
     vice versa):

     "Agreement" means this Loan Agreement, as amended, supplemented,
      or modified from time to time.

     "Cempresa Shares" means two-thousand (2,000) shares representing
      forty percent (40%) of the issued and outstanding common stock 
      of Cempresa.

     "Conecell Shares" means thirteen million one hundred fifty
      seven thousand nine hundred forty-two (13,157,942) shares
      representing fifty-two and six tenths percent (52.6%) of the
      issued and outstanding common stock of Conecell.

      "Fideicomiso" means that certain trust  agreement to be
       entered into simultaneously herewith by and between the Borrower
       and the Lender, whereby the Borrower shall place the Cempresa
       Shares in an Ecuadorian trust for the benefit of Lender.
                                                            Page 1 of 9


       "Lender" means MasTec, Inc.
       
       "Loan" means the Twenty-Five Million Dollars ($25,000,000)
        being provided by Lender to Borrower under this Agreement.

        "Loan Documents" means this Loan Agreement, the Note, and
         all other documents evidencing this transaction.
        
        "Non-Recourse Promissory Note" shall have the meaning
         assigned to such term in Section 2.4.

        "Dollars" or "$" means the lawful currency of the United
         States of America.

        "Person" means an individual, partnership, corporation,
         business trust, joint stock company, trust, unincorporated
         association, joint venture, governmental authority, or other
         entity of whatever nature.


                                 ARTICLE II

                        AMOUNT AND TERMS OF THE LOAN

        Section 2.1   Loan; Funding.  The Lender agrees on the terms
        and conditions hereinafter set forth, to make a Loan to the
        Borrower on the date of this Agreement in the amount of Twenty-
        Five Million Dollars ($25,000,000). The funding of the Loan by
        the Lender shall occur upon the execution- of this Agreement in
        the following manner:

         (i)  delivery of a check or wire transfer payable to the Borrower
         in the amount of Five Million Dollars ($5,000,000); and

         (ii) delivery of a Letter of Credit issued by Shawmut Bank
         Connecticut, N.A. for the benefit of the Borrower in the
         amount of Twenty Million Dollars ($20,000,000) and in the
         form of Exhibit "All attached hereto and made a part hereof
         (the "Letter of Credit").

The Lender acknowledges and agrees that the amount payable under
Letter of Credit represents a portion of the Loan which has been 
funded as of the date of this Agreement and that the Lender shall
not have the right, under any circumstances, to interfere in any
way with the payment of the Letter of Credit pursuant to its
terms.  The Lender hereby waives and relinquishes any and all
rights of any kind to exercise set-off or pose counterclaims with
regard to the Letter of Credit and shall not obstruct the payment
under the Letter of Credit even if an Event of Default (as
defined below) were to occur under this Agreement.

        Section 2.2 Payment.  The Loan and all accrued and unpaid
        interest thereon shall be due and payable in full upon the
        expiration of the Term, as defined herein in Section 2.2;
        provided however, that the Loan and all accrued and unpaid
        interest thereon (i) shall be due and payable in full upon the
        Sale of the Conecell Shares as described in Section 2.7; and (ii)
                                                                Page 2 of 9 
        
        shall be deemed paid in full upon the transfer to the Lender of
        the Cempresa Shares.  Provided that the Sale has not commenced as
        contemplated in Section 2.7 herein, the Lender shall have the
        option to accept the Cempresa Shares in satisfaction of the Loan
        instead of payment in dollars in the amount set forth herein.

        Section 2.3  No Prepayment.  The Borrower shall not have the
        right to prepay the Loan.

        Section 2.4 Interest.  The Lender shall be entitled to interest
        on the unpaid principal amount of the Loan outstanding during the
        initial Term of this Agreement and any extensions thereof, as
        follows:

         (i)  During the initial Term, the first one hundred and eighty
         (180) days of this Agreement, the Loan shall bear interest
         at the annual rate of fifteen percent (15%).
 
         (ii) In the event that this Agreement is extended for an
         additional period of ninety (90) days by the Borrower, as
         provided herein, the Loan shall bear interest at the annual
         rate of seventeen and one half percent (17.5%)

         (iii)  In the event that this Agreement is extended for the
         second period of ninety (90) days and the final period of
         forty five (45) days by the Borrower, as provided herein,
         the Loan shall bear interest at the annual rate of seventeen
         and one half percent (17.5%).
         
Interest shall be calculated on the basis of a year of three
hundred sixty five (365) days for the actual number of days
elapsed.  Interest shall be due and payable on the Maturity Date
(as defined in Section 2.5 below).

In no contingency or event whatsoever, whether by reason of
advancement of the Loan or otherwise, shall the amount paid or
agreed to be paid to Lender for the use, forbearance or detention
of money advanced hereunder exceed the highest lawful rate
permissible under any law which a court of competent jurisdiction
may deem applicable hereto.  In the event that such a court
determines that Lender has charged or received interest hereunder
in excess of the highest applicable rate, such rate shall
automatically be reduced to the maximum rate permitted by law and
Lender shall promptly refund to Borrower any interest received by
it in excess of the maximum lawful rate.  It is the intent hereof
that Borrower not pay or contract to pay, and that Lender not
receive or contract to receive, directly or indirectly in any
manner whatsoever, interest in excess of that which may be paid
by Borrower under applicable law.

        Section 2.5 Term.  This Agreement shall be for an initial
        term of six (6) months; provided, however, that the initial term
        may be extended by the Borrower for two (2) separate ninety (90)
        day-periods by providing the Lender with five (5) days written
        notice prior to the expiration of an applicable term; provided,
        however, that the Borrower may extend this Agreement for an
        additional forty five (45) days in the event that Cempresa shall
        have entered into an agreement with a purchaser to sell the
                                                                Page 3 of 9    
          
        Conecell Shares prior to July 14, 1996 (collectively, the
        "Term").  As used in this Agreement, the "Maturity Date" means
        the last day of the Term.

        Section 2.6 Note.  The Loan made by the Lender under this
        Agreement shall be evidenced by a Non-Recourse Promissory Note of
        the Borrower (the "Note") in the principal amount of Twenty Five
        Million Dollars ($25,000,000), dated as of the date of this
        Agreement.  As described in the Note, in the event of any default
        by Borrower under this Agreement or the Note, the Lender's sole
        recourse shall be the Cempresa Shares.
        
        Section 2.7 Sale of Conecell Shares.  The Lender
        acknowledges and agrees that the Borrower, in its sole and
        absolute discretion, may authorize and cause Cempresa to sell the
        Conecell Shares, subject only to the conditions set forth in
        Section 2.8 below.  In the event that the Borrower decides to
        sell the Conecell Shares, the Lender agrees to cooperate with
        regard to such sale and to execute any documents reasonably
        deemed necessary or appropriate by the Borrower to effectuate the
        sale.  If the Borrower sells the Conecell Shares during the Term
        (the "Sale") , at the closing of the Sale the Borrower shall pay
        the Lender, in satisfaction of any and all amounts owed by
        Borrower under this Agreement, the following sum: (a) the
        outstanding principal amount of the Loan plus accrued and unpaid
        interest thereon; and (b) the net proceeds of the Sale
        attributable to the Cempresa Shares after deducting (i) the
        amount payable in (a) above, and (ii) fifty percent (50%) of the
        difference between the amount payable in (a) above and the net
        proceeds of the Sale attributable to the Cempresa Shares.  As
        used  in this Agreement, "net proceeds" means the gross proceeds
        received by Cempresa from the Sale of the Conecell Shares, less
        all applicable fees, taxes, commissions and expenses relating to
        the Sale.

        Section 2.8 Lender's Rights Regarding Sale.  If the purchase
        price offered to Cempresa (the "Offer") for the Conecell Shares
        shall be less than Ninety Million Dollars ($90,000, 000), the
        Lender shall have the right to either (i) match the Offer and
        acquire the Conecell Shares on the exact terms and conditions of
        the Offer; or (ii) veto the proposed Sale of the Conecell Shares;
        provided, however, that Borrower shall have the right, in its
        sole and absolute discretion, to accept the Offer and sell the
        Conecell Shares, notwithstanding Lender' s veto rights, if the
        Borrower shall agree to pay Lender Five Million Dollars ($5,000,000)
        plus the Loan and any accrued and unpaid interest thereon
        (the "Veto Payment").  The Veto Payment shall be in lieu of any
        other payments or sums due to the Lender under Section 2.7 above
        and the Lender shall have no rights to the Cempresa Shares after
        receipt of the Veto Payment.  The Veto Payment shall be due and
        payable by Borrower at the closing of the Sale of the Conecell
        Shares.  If Borrower intends to sell the Conecell Shares for less
        than Ninety Million Dollars ($90,000,000), Borrower agrees to
        provide prior written notice to Lender twenty (20) days prior to
        the proposed consummation of the Sale of the Conecell Shares. 
        Lender shall then have ten (10) days to either match the Offer
        and acquire the Conecell Shares, as provide in (i) above, or to
         
                                                                Page 4 of 9   
          
        exercise its veto as provided in (ii) above subject to Borrower's
        right to pay the Veto Payment. if Lender fails to notify Borrower
        in writing within the prescribed ten-day (10) period, Lender
        shall waive its rights to match the Offer, any veto over the
        Offer and the Veto Payment.

        Section 2.9 "Fideicomiso".  In connection with the execution
        and delivery of this Agreement, the Borrower has executed and
        delivered to the Lender a Fideicomiso whereby the Borrower has
        placed all of the Cempresa Shares as security for its obligations
        under this Agreement and the Note.
        
                              ARTICLE III
            
                     CONDITIONS PRECEDENT TO THE LOAN

        Section 3.1 By executing this Agreement, the Lender
        acknowledges and agrees that the following conditions precedent
        have been satisfied:

         (i)  Lender has received the Note, duly executed and delivered by
         Borrower;

         (ii) Lender has received the Convenio de Fideicomiso executed by
         Borrower in favor of Lender, and such other documents, stock
         powers and stock certificates that Lender has required in
         connection with the Fideicomiso; and

         (iii) Borrower  has  demonstrated that it is in good standing
         in  its place of incorporation and in any other jurisdiction
         where such qualification is necessary or desirable.

                                  ARTICLE IV

                       REPRESENTATIONS AND WARRANTIES

The Borrower represents and warrants to the Lender that:

        Section  4.1 Incorporation, Good Standing, and Due Qualific-
        cation.   The Borrower is a corporation duly incorporated, validly
        existing, and in good standing  under the laws of the British
        Virgin  Islands; has the corporate power and authority to own its
        assets and to transact the business in which it is now engaged or
        proposes to be engaged in; and is duly qualified as a foreign
        corporation and in good standing under the laws of such other
        jurisdiction in which such qualification is required.

        Section  4.2  Corporate Power and Authority.  The execution,
        delivery and performance by the Borrower of the Loan Documents
        have been duly authorized by all necessary corporate action and
        do not and  will not (i) require any consent or approval of the
        stockholders of such corporation;  (ii)  contravene  such
        corporation's charter or bylaws; (iii) violate any provision of
        any law, rule or regulation, order, writ, judgement, injunction,
        decree,  determination, or award presently in effect having
        applicability to such corporation; (iv) result in a breach of or
        violation of any other agreement, lease, or instrument to which
          
                                                            Page 5 of 9   
          
        such corporation may be a party or by which it or its properties
        may be bound or affected; (v) result in, or require the creation
        or imposition of any lien upon or with respect to any of the
        properties now owned or hereafter acquired by such corporation;
        or  (vi) cause such corporation to be in default under any such
        law, rule, regulation, order, writ, judgement, injunction,
        decree, determination, or award or any such indenture, agreement,
        lease or instrument.

        Section  4.3  Legally Enforceable Agreement.  This Agreement
        and each of the other Loan Documents when delivered will be,
        legal, valid, and binding obligations of the Borrower,
        enforceable against the Borrower in accordance with their
        respective terms.

        Section 4.4 Valid Title to Cempresa Shares.  Borrower has
        good and valid title to the Cempresa Shares, free and clear of
        any and all encumbrances, security interests and other adverse
        claims whatsoever.

        Section 4.5 Valid Title to Conecell Shares.  Cempresa has
        good and valid title to the Conecell Shares, free and clear of
        any and all encumbrances, security interests and other adverse
        claims whatsoever, including but not limited to applicable
        creditor's remedies, pursuant to fraudulent and preferential
        transfer laws.

        Section 4.6 Cellular License.  Conecell has a license to
        operate a cellular phone service and an international teleport
        system in the Republic of Ecuador.

                                 ARTICLE V

                                  CLOSING

The closing and funding of the Loan shall occur
simultaneously with the execution of this Agreement and the other
Loan Documents.


                                 ARTICLE VI

                             EVENTS OF DEFAULT

          Section 6.1 Events of Default.  The entire unpaid principal
          balance of the Loan, and all other sums owing under this
          Agreement or any other instrument or document executed by the
          Borrower in connection with the Loan, shall at the option of the
          Lender become immediately due and payable upon the occurrence of
          any one or more of the following events ("Events of Default") ,
          regardless of the cause thereof and whether within or beyond the
          control of the Borrower:

             (i)  If Borrower shall make any representations or warranties in
             any of the Loan Documents or in any certificate furnished at
             any time hereunder or in connection with any of the Loan
             Documents which proves to have been untrue or misleading in
             any material respect when made or furnished;
                                                                Page 6 of 9


             (ii) If Borrower shall default in the observance or performance
             of any agreement or covenant contained in this Agreement or
             any of other Loan Document, unless such default is cured
             within thirty (30) days thereafter;


             (iii)  If Borrower shall file a voluntary petition in
             bankruptcy or a voluntary petition or answer seeking
             liquidation, reorganization, arrangement, re-adjustment of
             its debts, or for any other relief under the Bankruptcy
             Code, or under any other act or law pertaining to
             insolvency or debtor relief, whether state, federal, or
             foreign, now or hereafter existing; Borrower shall enter
             into any agreement indicating its consent to, approval of,
             or acquiescence in, any such petition or proceeding;
             Borrower shall apply for or permit the appointment by
             consent or acquiescence of a receiver, custodian or trustee
             of Borrower for all or a substantial part of its property;
             Borrower shall make an assignment for the benefit of
             creditors; or Borrower shall be unable or shall fail to pay
             its debts generally as such debts become due, or Borrower
             shall admit, in writing, its inability or failure to pay its
             debts generally as such debts become due; or
             
             (iv) If the Borrower shall make an assignment for the benefit of
             creditors, file a petition in bankruptcy, apply to or
             petition any tribunal for the appointment of a custodian,
             receiver, intervenor or trustee for the Borrower or a
             substantial part of Borrower's assets; or if the Borrower
             shall commence any proceeding under any bankruptcy,
             arrangement, readjustment of debt, dissolution or
             liquidation law or statute of any jurisdiction, whether now
             or hereafter in effect; or if any such petition or
             application shall have been filed or proceeding commenced
             against the Borrower or if any such custodian, receiver,
             intervenor or trustee shall have been appointed and the same
             shall have not been dismissed within sixty (60) days after
             such filing, commencement or appointment.
             
                                  ARTICLE VII
               
                     REMEDIES AND WAIVER OF ANY OTHER RIGHTS

          Section  7.1  Remedies.  Upon the occurrence or existence of
          any Event of Default, Lender's sole and exclusive remedy shall be
          to  take possession of the Cempresa Shares pursuant to the
          Fideicomiso.  The Lender hereby acknowledges and agrees to waive
          any and all other rights or remedies that Lender may have under
          the laws of the Republic of Ecuador, the United States of America
          and  any other applicable jurisdiction to collect the proceeds of
          the Loan, including principal and accrued interest thereon, or to
          enforce  any claim whatsoever against the Borrower due to
          Borrower's  Default.  The parties hereto acknowledge and agree
          that  the foregoing waiver by Lender does not intend to limit any
          rights which the Lender may acquire as a shareholder in the event
          the  Lender becomes a shareholder of Cempresa, including the
          rights of first refusal described in Section 8.1.
                                                               Page 7 of 9

                                 
                                 ARTICLE VIII

                            RIGHT OF FIRST REFUSAL

          Section 8.1    Right of First Refusal.  In the event that
          the Lender shall become  a shareholder of Cempresa pursuant
          to Section 7.1 of this Agreement, the Borrower and the
          Lender shall grant to each other a right of first refusal
          with regard to their respective share interests in Cempresa. 
          The right of first refusal shall provide that either party
          must provide the other with written notice at least twenty
          (20) days prior to the sale of their respective shares to a
          third party.  The party receiving the notice shall have ten
          (10) days to purchase the other party's shares on the same
          terms as that being contemplated.

                                 ARTICLE IX

                                MISCELLANEOUS

          Section 9.1 Entirety.  This Agreement, including the other
          documents referred to herein, which form a part hereof, contains
          the entire understanding of the parties hereto with respect to
          the subject matter contained herein and therein.  This Agreement
          supersedes all prior oral or written agreements and
          understandings between the parties with respect to such subject
          matter.

          Section 9.2 Amendments, Etc.  No amendment, modification,
          termination, or waiver of any provision of any Loan Document to
          which the Borrower is a party, nor consent to any departure by
          the Borrower from any Loan Document to which it is a party, shall
          in any event be effective unless the same shall be in writing and
          signed by the Lender, and then such waiver or consent shall be
          effective only in the specific instance and for the specific
          purpose for which given.

          Section 9.3 Notices, Etc.  All notices and other communications
          provided for under this Agreement and under the other Loan
          Documents to which the Borrower is a party shall be in writing
          via telecopy with a confirmation by mail, or delivered, as to
          each party, at such address as contained herein.

          Section 9.4 Successors and Assigns.  This Agreement shall be
          binding upon and inure to the benefit of the Borrower and the
          Lender and shall not be assignable or transferred by either
          without the written consent of the other party hereto.

          Section 9.5  Governing Law; Jurisdiction.  This Agreement
          and the Note shall be governed by, and construed in accordance
          with, the laws of the State of Florida.  To the fullest extent
          permitted by law, the Borrower and the Lender submit to the
          jurisdiction of the state and federal courts in the State of
          Florida for the purposes of any action or proceeding relating to
          this Agreement or any other Loan Document, and agree that the
          venue of any such action or proceeding may be laid in Dade
          
                                                                Page 8 of 9   
          
          County, Florida, and waive any claim that the same is an
          inconvenient forum.  No provision of this Agreement shall limit
          the Lender's right to serve legal process in any other manner
          permitted by law or to bring any such action or proceeding in any
          other competent jurisdiction.

          Section 9.6 Service of Process.  The Borrower hereby
          irrevocably appoints C.T. Corporation (the "Process Agent"), with
          an off ice on the date hereof at 1200 South Pine Island Road,
          Plantation, Florida 33324, as its agent to receive on its behalf
          service of copies of any summons and complaint and any other
          process which may be served in any action or proceeding, provided
          that a copy of such process is also mailed, to the Borrower at
          its address specified herein.  Such service may be made by
          mailing or delivering a copy of such process to the Borrower in
          care of the Process Agent at the Process Agent's above address,
          and the Borrower hereby irrevocably authorizes and directs the
          Process Agent to accept such service on its behalf.

          Section 9.7     Severability of Provisions.  Any provision
          of any Loan Document which is prohibited or unenforceable in any
          jurisdiction shall, as to such jurisdiction, be ineffective to
          the extent of such prohibition or unenforceability without
          invalidating the remaining provisions of such Loan Document or
          affecting the validity or enforceability of such provision in any
          other jurisdiction.


              IN WITNESS WHEREOF, the parties hereto have caused this
          Agreement to be executed by their respective officers or legal
          representatives thereunto duly authorized, as of the date first
          above written.


          DEVONO COMPANY LIMITED, the
          Borrower.



          By:  /s/  Simon Parra
          ----------------------------------------------
          SIMON PARRA, Legal Representative
          Road Town
          Post Office Box No. 71
          Tortola, British Virgin Islands



          MASTEC, INC., the  Lender.


          By:    /s/   Jorge Mas
          ---------------------------------------------
          8600 N.W 36th Street
          8th Floor
          Miami, FL 33166


                                                                  Page 9 of 9