Document:

<PAGE>
                                                                   Exhibit 10.22

           AMENDMENT NO. 7 TO REVOLVING CREDIT AND SECURITY AGREEMENT,
                               WAIVER AND CONSENT

         THIS AMENDMENT NO. 7 TO REVOLVING CREDIT AND SECURITY AGREEMENT, WAIVER
AND CONSENT (this "Amendment") is made and entered into as of July 22, 2004,
between MasTec, Inc., a Florida corporation ("MasTec"), the Subsidiaries of
MasTec identified on the signature pages hereto (together with MasTec,
hereinafter collectively referred to as the "Borrowers"), the financial
institutions party from time to time to the Loan Agreement (as hereinafter
defined) (the "Lenders") and Fleet Capital Corporation, a Rhode Island
corporation, as administrative agent (the "Administrative Agent") for the
Lenders.

                                    RECITALS:

         The Borrowers, the Lenders and the Administrative Agent are parties to
a Revolving Credit and Security Agreement dated as of January 22, 2002 (as
amended and in effect on the date hereof, the "Loan Agreement"), pursuant to
which the Lenders have made certain revolving credit loans and letter of credit
accommodations to or for the benefit of the Borrowers.

         The Borrowers have requested that the Lenders agree to amend the Loan
Agreement to, among other things, amend the financial covenants set forth in
Section 11.1 of the Loan Agreement.

         The Borrowers have informed the Administrative Agent and the Lenders
that certain Defaults exist under the Loan Agreement by reason of the following
(collectively, the "Designated Defaults"): (i) the Borrowers' failure to deliver
timely to the Administrative Agent and the Lenders the Borrowers' unaudited
financial statements for the fiscal month and the Fiscal Year ended December 31,
2003, the Borrowers' audited financial statements for the Fiscal Year ended
December 31, 2003, and the Borrowers' unaudited financial statements for the
fiscal months ended January 31, 2004, February 29, 2004, March 31, 2004, April
30, 2004 and May 31, 2004, in each case as required by Section 10.1 of the Loan
Agreement (collectively, the "Financial Statement Defaults"); and (ii) the
dissolution of GMR Telecom, L.L.C., a Virginia limited liability company. The
Borrowers have further requested that the Lenders waive the Designated Defaults.

         The Borrowers have further requested that the Lenders (a) consent to
the filing of a petition in bankruptcy in Brazil by, and the resulting
liquidation in bankruptcy of, MasTec Brasil, S.A. and (b) evidence in writing
the Lenders' consent to the prepayment in full by one or both of the Canadian
Entities of the entire unpaid principal balance of and all accrued and unpaid
interest on the Debt owing by the Canadian Entities to The Bank of Nova Scotia
("ScotiaBank") under those certain loan agreements entered into between
ScotiaBank and the Canadian Entities, which prepayments were made in April,
2004, as disclosed in advance to the Administrative Agent and the Lenders, in an
aggregate amount not in excess of $2,200,000 (the "Requested Consents").

          Upon the terms and subject to the conditions hereinafter set forth,
the Lenders have agreed so to amend the Loan Agreement, to waive the Designated
Defaults and to grant the Requested Consents.

<PAGE>

         NOW, THEREFORE, for TEN DOLLARS ($10.00) in hand paid and other good
and valuable consideration, the receipt and sufficiency of which are hereby
severally acknowledged, the parties hereto, intending to be legally bound
hereby, agree as follows:

         1. DEFINITIONS. All capitalized terms used in this Amendment, unless
otherwise defined herein, shall have the meaning ascribed to such terms in the
Loan Agreement.

         2. AMENDMENTS TO LOAN AGREEMENT. Subject to the provisions of Section 5
of this Amendment, the Loan Agreement is hereby amended as follows:

          (a) By deleting the definition of "DirecTV Concentration Percentage"
set forth in Section 1.1 of the Loan Agreement and by substituting the following
new definition in lieu thereof:

                 "DIRECTV CONCENTRATION PERCENTAGE" means 20%, or such lesser
         percentage as the Administrative Agent may in its reasonable credit
         judgment determine from time to time.

         (b) By deleting Section 8.7(a) of the Loan Agreement and by
substituting the following new Section 8.7(a) in lieu thereof:

         Section 8.7 OWNERSHIP AND DEFENSE OF TITLE.

                  (a) Except for Permitted Liens, the Borrowers shall be or
         shall cause another Loan Party to be at all times the sole owners or
         lessees of each and every item of Collateral and shall not create nor
         permit any other Loan Party to create any lien on, or sell, lease,
         exchange, assign, transfer, pledge, hypothecate, grant a security
         interest or security title in or otherwise dispose of, any of the
         Collateral or any interest therein, except for (i) sales of Inventory
         in the ordinary course of business, for cash or on open account or on
         terms of payment ordinarily extended to its customers, (ii) sales of
         the Real Estate described in column 3 on ANNEX D, (iii) sales of
         Inventory other than in the ordinary course of business and of
         Equipment and other capital assets (other than the Real Estate
         described in clause (ii) above) having an aggregate value (determined
         at the higher of net book value and fair market value) not to exceed
         $5,000,000 (or 100% of the capital stock of a Subsidiary, the value of
         all assets of which (determined at the higher of net book value and
         fair market value) does not exceed $5,000,000) in any Fiscal Year, (iv)
         sales during the period commencing on the Amendment No. 5 Effective
         Date and ending on June 30, 2004, of excess or obsolete Equipment no
         longer used or useful in the business of the Borrowers having an
         aggregate net book value not to exceed $7,000,000, (v) sales during
         Fiscal Year 2004 (in addition to sales of Equipment or other capital
         assets during Fiscal Year 2004 permitted under clauses (iii) and (iv)
         above) of excess or obsolete Equipment no longer used or useful in the
         business of the Borrowers having an aggregate value (determined at the
         higher of net book value and fair market value) not to exceed
         $1,000,000, and (v) dispositions that are otherwise expressly permitted
         under this Agreement, any Security Document, or any Subsidiary Security
         Agreement.

         (c) By deleting Section 8.12(g) of the Loan Agreement and by
substituting the following new Section 8.12(g) in lieu thereof:

                  (g) ADDITIONAL INFORMATION. If, at any time, the
         Administrative Agent requests that the Borrowers deliver the schedules
         and certificates described in SECTIONS 8.12(A),

                                       2
<PAGE>

         (B), (C), (D) and (F) more or less often, on different schedules or in
         greater or less detail than specified in such Sections, the Borrowers
         will comply with such requests. The Borrowers will also furnish to the
         Administrative Agent and each Lender such other information with
         respect to the Collateral or any Borrower's financial condition or
         results of operations as the Administrative Agent or any Lender may
         from time to time reasonably request.

         (d) By adding the following proviso immediately before the period at
the end of Section 9.1 of the Loan Agreement:

                  ; PROVIDED, that any Foreign Subsidiary (other than a Canadian
         Entity) may be dissolved, liquidated or wound up pursuant to the
         applicable provisions of the laws of such Foreign Subsidiary's
         jurisdiction of organization so long as (a) the Administrative Agent
         shall have received, not less than 10 Business Days prior to the
         effective date of any such dissolution, liquidation or winding up, each
         document prepared by or on behalf of any Loan Party relating to such
         dissolution, liquidation or winding up, together with such other
         documents as may be reasonably requested by the Administrative Agent
         (including, without limitation, legal opinions of counsel to such
         Foreign Subsidiary or the Loan Parties), and (b) the Administrative
         Agent shall be satisfied, in its sole discretion, that, and shall have
         received a certificate of the chief executive officer of MasTec or of a
         Financial Officer to the effect that, any such dissolution, liquidation
         or winding up could not reasonably be expected to (i) have an adverse
         effect upon the business, assets, properties, liabilities, condition
         (financial or otherwise), results of operations or business prospects
         of any Loan Party, (ii) have an adverse effect upon the value of the
         whole or any material part of the Collateral, the Liens of the
         Administrative Agent with respect to the Collateral or the priority of
         any such Liens, (iii) materially impair the ability of any Loan Party
         to perform its obligations under this Agreement or any of the other
         Loan Documents, including repayment of any of the Secured Obligations
         when due, or (iv) materially impair the ability of the Administrative
         Agent or any Lender to enforce or collect the Secured Obligations or
         realize upon any of the Collateral in accordance with the Loan
         Documents and Applicable Law, in each case prior to the effective date
         of such dissolution, liquidation or winding up.

         (e) By deleting Sections 10.1(a) and (b) and by substituting the
following new Sections 10.1(a) and (b) in lieu thereof:

                  (a) AUDITED YEAR-END STATEMENTS. As soon as available, but in
         any event within 90 days after the end of each Fiscal Year (or, in the
         case of the Fiscal Year ending December 31, 2003, not later than July
         29, 2004), copies of the consolidated balance sheet of MasTec and its
         Consolidated Subsidiaries as at the end of such Fiscal Year and the
         related consolidated statements of income, shareholders' equity and
         cash flows of MasTec and its Consolidated Subsidiaries for such Fiscal
         Year, and the consolidating balance sheets and related consolidating
         statements of income and cash flows for MasTec's NAOperations (in the
         aggregate) and, for so long as such Persons exist, for MasTec Brasil
         and all other Subsidiaries taken together, in each case setting forth
         in comparative form the figures for the previous Fiscal Year, and, as
         to such consolidated financial statements, reported on, without
         qualification, by Ernst & Young LLP or other "Big Four" independent
         certified public accountants;

                                       3
<PAGE>

                   (b) MONTHLY FINANCIAL STATEMENTS. As soon as available after
         the end of each fiscal month, but in any event within 45 days after the
         end of each month ending on or prior to September 30, 2004 (or, in the
         case of the fiscal months ending December 31, 2003, January 31, 2004,
         February 29, 2004, March 31, 2004 and April 30, 2004, not later than
         July 15, 2004, and of the fiscal month ending May 31, 2004, no later
         than July 27, 2004) and thereafter within 30 days after the end of each
         month (or 45 days after the end of any such month that is the last
         month of a Fiscal Quarter), copies of the unaudited consolidated
         balance sheet of MasTec and its Consolidated Subsidiaries as at the end
         of such month and the related unaudited consolidated statements of
         income and cash flows for MasTec and its Consolidated Subsidiaries and
         the consolidating balance sheets and related consolidating statements
         of income and cash flows for MasTec's NAOperations (in the aggregate)
         and, for so long as such Persons exist, for MasTec Brasil and all other
         Subsidiaries taken together, for such month and for the portion of the
         Fiscal Year through such month, certified by a Financial Officer as
         presenting fairly the financial condition and results of operations of
         MasTec and its Consolidated Subsidiaries and MasTec's NAOperations
         (subject to normal year-end audit adjustments) for the applicable
         period(s); all such financial statements to be complete and correct in
         all material respects and prepared in accordance with GAAP (except,
         with respect to interim financial statements, for the omission of notes
         and for the effect of normal year-end audit adjustments and all audit
         adjustments for the Fiscal Year ended December 31, 2003, that affect
         the fiscal months ending January 31, 2004, February 29, 2004 and March
         31, 2004 shall be reflected in the March 31, 2004 financial statements)
         applied consistently throughout the periods reflected therein; and

         (f) By deleting Sections 11.1 (a) and (b) and by substituting the
following new Sections 11.1(a) and (b) in lieu thereof:

                  (a) TANGIBLE NET WORTH. Permit consolidated Tangible Net Worth
         of MasTec's NAOperations at any time on or after April 1, 2004, to be
         less than the sum of (i) $62,000,000, PLUS (ii) an amount equal to 50%
         of consolidated Net Income (but without deduction for any Net Loss) of
         MasTec's NAOperations for the period from April 1, 2004, through the
         date of determination, treated as a single accounting period.

                  (b)   FIXED CHARGE COVERAGE RATIO. Permit the Fixed Charge
         Coverage Ratio to be less than the ratio set forth below for the period
         corresponding thereto:

                   Period                                      Ratio
                   ------                                      -----

                  The 2-calendar month period ending          1.00 to 1.00
                  on May 31, 2004

                  The 3-calendar month period ending          1.50 to 1.00
                  on June 30, 2004

                  The 4-calendar month period ending          1.75 to 1.00
                  on July 31, 2004

                  The 5-calendar month period ending          1.75 to 1.00
                  on August 31, 2004

                                       4
<PAGE>

                  The 6-calendar month period ending          1.75 to 1.00
                  on September 30, 2004

                  The 7-calendar month period ending          2.00 to 1.00
                  on October 31, 2004

                  The 8-calendar month period                 2.00 to 1.00
                  ending on November 30, 2004

                  The 9-calendar month period                 2.00 to 1.00
                  ending on December 31, 2004

                  The 10-calendar month period                2.00 to 1.00
                  ending on January 31, 2004

                  The 11-calendar month period                2.00 to 1.00
                  ending on February 28, 2005

                  The 12-month period ending                  2.00 to 1.00
                  on March 31, 2005, and each
                  12-month period ending on
                  the last day of each calendar month
                  thereafter

         3. LIMITED WAIVER OF DESIGNATED DEFAULTS. Subject to the provisions of
Section 5 of this Amendment, the Administrative Agent and the Lenders hereby
waive the Designated Defaults in effect on the date hereof. In no event shall
the foregoing waiver be deemed to constitute a waiver of (i) any Default or
Event of Default that may exist on the date of this Amendment (other than the
Designated Defaults) or (ii) the Borrowers' respective obligations to comply
with all of the terms and conditions of the Loan Agreement and the other Loan
Documents from and after the date hereof. Notwithstanding any prior, temporary
mutual disregard of the terms of any contracts between the parties, each
Borrower hereby agrees that it shall be required strictly to comply with all of
the terms of the Loan Agreement and the other Loan Documents on and after the
date hereof.

         4. LIMITED CONSENT. Subject to the provisions of Section 5 of this
Amendment, the Administrative Agent and the Lenders hereby grant the Requested
Consents.

         5. CONDITIONS TO EFFECTIVENESS. The provisions of paragraphs (b) and
(f) of Section 2 of this Amendment shall become effective as of December l,
2003, and the provisions of paragraphs (a), (c), (d) and (e) of Section 2 and of
Sections 3 and 4 of this Amendment shall become effective as of the date hereof,
in each case on the date (the "Amendment No. 7 Effective Date") on which the
Administrative Agent shall have received on or before July 29, 2004: (a) a fee
in the amount of $437,500 for the Ratable account of the Lenders, which fee is
earned on the date hereof and is not subject to refund or rebate of any kind
whatsoever, and (b) the following documents, each of which shall be satisfactory
in form and substance to the Administrative Agent and in sufficient copies for
each Lender:

                                       5
<PAGE>

                  (i) this Amendment duly executed and delivered by the
         Borrowers, the Required Lenders and the Administrative Agent;

                  (ii) a certificate of the secretary or assistant secretary of
         each Borrower having attached thereto the articles or certificate of
         incorporation and bylaws of such Borrower (or containing the
         certification of such secretary or assistant secretary that no
         amendment or modification of such articles or certificate of
         incorporation or bylaws has become effective since the last date on
         which such documents were last delivered to the Lenders), all corporate
         or company action, including shareholders' or members' approval, if
         necessary, has been taken by such Borrower and/or its shareholders or
         members to authorize the execution, delivery and performance of this
         Amendment and to the further effect that the incumbency certificate
         most recently delivered to the Lenders remains in effect, unchanged;

                  (iii) a certificate of the chief executive officer of MasTec
         stating that, to the best of his or her knowledge and based on an
         examination sufficient to enable him or her to make an informed
         statement, after giving effect to the Amendment and to the revised
         Schedules to the Loan Agreement delivered therewith,

                           (A) all of the representations and warranties made or
                  deemed to be made under the Loan Agreement are true and
                  correct on and as of the Amendment No. 7 Effective Date, and

                           (B) no Default or Event of Default exists;

                  and the Administrative Agent shall be satisfied as to the
                  truth and accuracy thereof;

                  (iv) MasTec's annual report on Form 10-K for its Fiscal Year
         ended December 31, 2003, as filed with the Securities and Exchange
         Commission, which annual report shall include financial statements for
         MasTec and its Consolidated Subsidiaries that are reported on, without
         qualification, by Ernst & Young LLP and are identical in all material
         respects to the financial statements most recently delivered to the
         Administrative Agent and the Lenders;

                  (v) evidence satisfactory to the Administrative Agent in its
         sole discretion of the payment in full of all of the Debt outstanding
         under the ScotiaBank Loan Agreements on or prior to the Amendment No. 7
         Effective Date; and

                  (vi) such other documents and instruments as any Lender
         through the Administrative Agent may reasonably request.

         6. ESTABLISHMENT OF ADDITIONAL RESERVE. The Borrowers hereby
acknowledge and agree that, in consideration of the modifications effected by
this Amendment, the Administrative Agent will establish an Additional Reserve
against the Borrowing Base in the amount of $3,225,000. Such new Additional
Reserve shall continue in effect during the period commencing on the date hereof
and ending on the date of the Administrative Agent's and the Lenders' receipt of
the Borrowers' unaudited financial statements and the related officer's
certificate for any fiscal month ending on the last day of a Fiscal Quarter on
or after September

                                       6
<PAGE>

30, 2004, that (i) satisfy the respective requirements of Sections 10.1(b) and
10.3 of the Loan Agreement, (ii) reflect the Borrowers' compliance with the
requirements of Sections 11.1 (as amended by this Amendment), 11.2, 11.4 and
11.5 of the Loan Agreement and the absence of any other Default or Event of
Default, in each case as at the end of such fiscal month, and (iii) reflect
Borrowers' maintenance of an Fixed Charge Coverage Ratio of not less than 2.00
to 1.00 during each of the 2 consecutive Fiscal Quarters ending on the last day
of such Fiscal Quarter. Nothing in the foregoing shall limit or restrict in any
way the right of the Administrative Agent to change the amount or the period of
effectiveness of such new Additional Reserve or to establish, change and
otherwise employ any other Additional Reserve or any other reserve from time to
time in the exercise of its reasonable credit judgment.

         7. REPRESENTATIONS AND WARRANTIES. To induce the Administrative Agent
and the Lenders to enter into this Amendment, each Borrower hereby makes the
following representations and warranties to the Administrative Agent and the
Lenders, which representations and warranties shall survive the delivery of this
Amendment and the making of additional Loans under the Loan Agreement as amended
hereby:

                  (a) AUTHORIZATION OF AGREEMENTS. Each Borrower has the right
         and power, and has taken all necessary action to authorize it, to
         execute, deliver and perform this Amendment and each other agreement
         contemplated hereby to which it is a party in accordance with their
         respective terms. This Amendment and each other such agreement
         contemplated hereby to which it is a party has been duly executed and
         delivered by the duly authorized officers of such Borrower and each is,
         or each when executed and delivered in accordance with this Amendment
         will be, a legal, valid and binding obligation of such Borrower,
         enforceable in accordance with its terms.

                  (b) COMPLIANCE OF AGREEMENTS WITH LAWS. The execution,
         delivery and performance of this Amendment in accordance with their
         respective terms do not and will not, by the passage of time, the
         giving of notice or otherwise,

                           (i) require any Governmental Approval that has not
                  been obtained or violate any Applicable Law relating to such
                  Borrower or any of its Subsidiaries,

                           (ii) conflict with, result in a breach of or
                  constitute a default under the articles or certificate of
                  incorporation or by-laws or other constituent documents or any
                  shareholders' or members' agreement of such Borrower or any of
                  its Subsidiaries, any material provisions of any indenture,
                  agreement or other instrument to which such Borrower, any of
                  its Subsidiaries or any of such Borrower's or such
                  Subsidiaries' property may be bound or any Governmental
                  Approval relating to such Borrower or any of its Subsidiaries,
                  or

                           (iii) result in or require the creation or imposition
                  of any Lien upon or with respect to any property now owned or
                  hereafter acquired by such Borrower other than the Security
                  Interest.

         8. EFFECT OF AMENDMENT. From and after the Amendment No. 7 Effective
Date, all references in the Loan Agreement and in any other Loan Document to
"this Agreement," "the Loan Agreement," "hereunder," "hereof" and words of like
import referring to the Loan Agreement, shall mean and at any time of
determination be references to the Loan Agreement as

                                       7
<PAGE>

amended by this Amendment. Except as expressly amended hereby, the Loan
Agreement and all terms, conditions and provisions thereof remain in full force
and effect and are hereby ratified and confirmed. The execution, delivery and
effectiveness of this Amendment shall not, except as expressly provided herein,
operate as a waiver of any right, power or remedy of the Administrative Agent or
any Lender under any of the Loan Documents, nor constitute a waiver of any
provision of any of the Loan Documents.

         9. BREACH OF AMENDMENT. Any breach by the Borrowers of any
representation, warranty or covenant contained herein shall constitute an Event
of Default.

         10. COUNTERPART EXECUTION; FACSIMILE SIGNATURES. This Amendment may be
executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed and delivered shall be
deemed to be an original and all of which taken together shall constitute but
one and the same agreement. Any signature delivered by a party by facsimile
transmission shall be deemed to be an original signature hereto.

         11. GOVERNING LAW. This Amendment shall be governed by and construed in
accordance with the laws of the State of Georgia without giving effect to
conflicts of law principles thereof.

         12. SUCCESSORS AND ASSIGNS. This Amendment shall be binding upon and
inure to the benefit of the parties hereto and their respective successors and
assigns.

         13. FURTHER ASSURANCES. The Borrowers agree to take such further
actions as any Lender through the Administrative Agent shall reasonably request
from time to time in connection herewith to evidence or give effect to the
amendments set forth herein or any of the transactions contemplated hereby.

         14. SECTION TITLES. Section titles and references used in this
Amendment shall be without substantive meaning or content of any kind whatsoever
and are not a part of the agreement among the parties hereto.

         15. WAIVER OF JURY TRIAL. TO THE FULLEST EXTENT PERMITTED BY APPLICABLE
LAW, EACH OF THE PARTIES HERETO HEREBY WAIVES THE RIGHT TO TRIAL BY JURY IN ANY
ACTION, SUIT, COUNTERCLAIM OR PROCEEDING ARISING OUT OF OR RELATED TO THIS
AMENDMENT.

         16. RELEASE OF CLAIMS. TO INDUCE THE ADMINISTRATIVE AGENT AND THE
LENDERS TO ENTER INTO THIS AMENDMENT, EACH BORROWER HEREBY RELEASES, ACQUITS AND
FOREVER DISCHARGES THE ADMINISTRATIVE AGENT AND THE LENDERS, AND ALL OFFICERS,
DIRECTORS, AGENTS, EMPLOYEES, SUCCESSORS AND ASSIGNS OF THE ADMINISTRATIVE AGENT
AND THE LENDERS, FROM ANY AND ALL LIABILITIES, CLAIMS, DEMANDS, ACTIONS OR
CAUSES OF ACTION OF ANY KIND OR NATURE (IF THERE BE ANY), WHETHER ABSOLUTE OR
CONTINGENT, DISPUTED OR UNDISPUTED, AT LAW OR IN EQUITY, OR KNOWN OR UNKNOWN,
THAT SUCH BORROWER NOW HAS OR EVER HAD AGAINST AGENT OR ANY LENDER ARISING UNDER
OR IN CONNECTION WITH ANY OF THE LOAN DOCUMENTS OR OTHERWISE. EACH BORROWER
REPRESENTS AND WARRANTS TO THE ADMINISTRATIVE AGENT AND THE LENDERS THAT SUCH
BORROWER HAS NOT TRANSFERRED OR ASSIGNED TO ANY PERSON ANY CLAIM THAT SUCH
BORROWER EVER HAD OR CLAIMED TO HAVE AGAINST THE ADMINISTRATIVE AGENT OR ANY
LENDER.

         17. EXPENSES OF ADMINISTRATIVE AGENT. The Borrowers agree to pay, ON
DEMAND, all costs and expenses reasonably incurred by the Administrative Agent
in connection with the

                                       8
<PAGE>

preparation, negotiation and execution of this Amendment and any other Loan
Documents executed pursuant hereto and any and all amendments, modifications,
and supplements thereto, including, without limitation, the reasonable costs and
fees of the Administrative Agent's legal counsel and any taxes or expenses
associated with or incurred in connection with any instrument or agreement
referred to herein or contemplated hereby.

                      [SIGNATURES BEGIN ON FOLLOWING PAGE]

                                       9
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed under seal and delivered by their respective duly authorized
officers as of the date first written above.

                                 FLEET CAPITAL CORPORATION,
                                 as the Administrative Agent and as a Lender

                                 By: /s/ Dennis S. Losin
                                     -------------------------------------------
                                     Name: Dennis S. Losin
                                           -------------------------------------
                                     Title: Senior Vice President
                                            ------------------------------------

                                 WACHOVIA BANK, NATIONAL ASSOCIATION,
                                 as a Lender

                                 By: /s/ Dan Denton
                                     -------------------------------------------
                                     Name: Dan Denton
                                           -------------------------------------
                                     Title: Director
                                            ------------------------------------

                                 LASALLE BUSINESS CREDIT, LLC,
                                 SUCCESSOR IN INTEREST TO LASALLE BUSINESS
                                 CREDIT, INC., as a Lender

                                 By: /s/ Douglas Colletti
                                     -------------------------------------------
                                     Name: Douglas Colletti
                                           -------------------------------------
                                     Title: Senior Vice President
                                            ------------------------------------

                                 JPMORGAN CHASE BANK, as a Lender

                                 By: /s/ Jeffrey S. Ackerman
                                     -------------------------------------------
                                     Name: Jeffrey S. Ackerman
                                           -------------------------------------
                                     Title: Vice President
                                            ------------------------------------

                                 PNC BANK, NATIONAL ASSOCIATION, as a Lender

                                 By: /s/ Alex M. Council
                                     -------------------------------------------
                                     Name: Alex M. Council
                                           -------------------------------------
                                     Title: Vice President
                                            ------------------------------------

                                       10
<PAGE>
                                 BORROWERS:

                                 MASTEC, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 CHURCH & TOWER, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 CHURCH & TOWER  ENVIRONMENTAL, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 CRUZ-CELL, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 DRESSER/AREIA CONSTRUCTION, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                       11
<PAGE>

                                 FLAIRE INCORPORATED

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC INTEGRATION SYSTEMS, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC NETWORK SERVICES, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC NORTH AMERICA, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC TELCOM & ELECTRICAL SERVICES, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 PHASECOM AMERICA, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                       12
<PAGE>

                                 PROTEL IND., INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 RENEGADE OF IDAHO, INC.

                                 By:    /s/ Austin Shanfelter
                                      --------------------------------
                                       Austin Shanfelter
                                       President and Chief Executive Officer

                                 S.S.S. CONSTRUCTION, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 UPPER VALLEY UTILITIES CORP.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 WILDE HOLDING CO., INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 WILDE ACQUISITION CO., INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                       13
<PAGE>

                                 NORTHLAND CONTRACTING, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 WILDE OPTICAL SERVICE, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC REAL ESTATE HOLDINGS, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC OF TEXAS, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC CONTRACTING COMPANY, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                       14
<PAGE>

                                 MASTEC MINNESOTA, SW, LLC

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer
                                     of MasTec Services Company, Inc.,
                                     Sole Member

                                 MASTEC SERVICES COMPANY, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC ASSET MANAGEMENT COMPANY, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC TC, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                 MASTEC FC, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                       15
<PAGE>

                                 STACKHOUSE REAL ESTATE
                                       HOLDINGS, INC.

                                 By: /s/ Austin Shanfelter
                                     -------------------------------------------
                                     Austin Shanfelter
                                     President and Chief Executive Officer

                                       16<PAGE>
                                                                   EXHIBIT 10.23

                              SEPARATION AGREEMENT
                               AND GENERAL RELEASE

         This Separation Agreement and General Release (the "Agreement") is
entered into as of March [22], 2004 ("Effective Date") between Eric Tveter
("Employee") and MasTec, Inc. ("MasTec" or "Employer") who agree as follows:

         1. Employees' employment shall terminate upon the execution of this
Agreement. The date of Employee's termination shall be referred to as the
Separation Date. The Parties agree the Employee is being terminated "without
cause" as such term is defined in that certain Employment Agreement entered into
between MasTec and Employee dated July 15, 2002 (the "Employment Agreement").

         2. MasTec shall pay Employee the following ("Severance Benefits"):

                  (a) Those benefits set forth in Sections 11(f) and 11(g) of
the Employment Agreement including (a) his New Base Salary from the Separation
Date through July 14, 2004, subject to mitigation, (b) his bonus for senior
management for calendar year 2003, if the Compensation Committee of the Board of
Directors of MasTec, in its sole and absolute discretion, elects to award such
bonus; and (c) all benefits set forth in Section 4(b) of the Employment
Agreement;

                  (b) The Parties acknowledge that in accordance with Section
4(a)(ii) of the Employment Agreement, Employee's New Base Salary for the period
commencing July 15, 2003, is $306,837.00;

                  (c) The Company acknowledges Employee voluntarily forfeited
$33,133.63 of his compensation during 2003 as part of a Company cost cutting
measure. In addition, the Company acknowledges that it failed to increase
Employee's salary to the New Base Salary level as of January 1, 2004, and will
make retroactive payment on the difference from January 1, 2004 through the
Separation Date. The Company agrees to pay said amounts to Employee prior to
March [31], 2004; and

                  (d) Subject to the limitations set forth in Section 4(d) of
the Employment Agreement, all previously issued options (i.e., the 50,000
options awarded to Employee under his Employment Agreement and the 35,000
options awarded to Employee during the term of his employment) will vest in
accordance with the incentive stock option plan and their respective vesting
schedules provided, however, subject to the approval of the Compensation
Committee of the Board of Directors of MasTec (the "Compensation Committee"),
the vesting schedule for that portion of the Retained Options which have not
vested prior to March [22], 2006, shall be extended until May 2, 2006 (the
previously issued options, the "Retained Options"). The Retained Options shall
remain exercisable for a period of six (6) months after vesting, provided
however, that any Retained Options that vested prior to the Separation Date
shall remain exercisable for a period of six (6) months after the Separation
Date. MasTec shall submit such request for the extension of the vesting schedule
to the Compensation Committee for approval within fifteen (15) days of the
execution of this Agreement. The Retained Options will be converted to
non-qualified stock options and thus subject to the non-qualified stock option
plan upon the expiration of three (3) months following the Separation Date,
however the conversion of the Retained Options shall not affect the vesting or
exercising of the Retained Options. Employee's eligibility (i) to purchase stock
under MasTec, Inc.'s Non-Qualified Employee Stock Purchase Plan, (ii) to
participate in Employer incentive compensation or other compensation plans and
(iii) to participate in any other benefit plan of

<PAGE>

Employer or its subsidiaries or affiliates is terminated as of the Separation
Date other than those benefits you are entitled to under Section 4(b) of the
Employment Agreement through July 14, 2004 . In the event the Compensation
Committee fails to approve the request of the extension of the vesting schedule
prior to April [19], 2004, Employee may, by April [26], 2004, terminate this
Agreement. Such notice shall be given as provided in Section 12(f) of the
Employment Agreement except that MasTec's address is modified to be: 800 Douglas
Road, 12th Floor, Coral Gables, Florida 33134. If Employee fails to give such
written notice prior to April [26], 2004, Employee's right to terminate this
Agreement shall terminate.

         3. Employee acknowledges that the Severance Benefits under this
Agreement are compensation and will be included in either a W-2 earnings
statement or a 1099 statement, and are subject to applicable payroll withholding
taxes. Employee further acknowledges that all Life and disability coverage and
participation in the 401(k) Retirement Plan will end on the Separation Date.

         4. Employee agrees that the Severance Benefits constitute sufficient
consideration for this Agreement. Employee acknowledges and agrees that no
consideration other than the Severance Benefits as provided for by this
Agreement has been or will be paid or furnished by Employer. Employee
acknowledges that the Severance Benefits includes compensation for any right
Employee may have or have had to (a) vacation, holiday, sick or personal days or
pay in lieu thereof, and (b) bonus, profit sharing or other incentive
compensation.

         5. Employee agrees, as a condition precedent to receipt of the
Severance Benefits pursuant to this Agreement, that Employee will deliver or
cause to be delivered to Employer not later than the Separation Date, (a) all
keys, ID cards, company automobile or other vehicle, corporate credit card,
laptop computer or other hardware, computer software of any kind, electronic
address book, portable telephone, radio, electronic beeper or other electronic
devices, equipment and all other property belonging to Employer and (b) all
originals and copies of any drawings, books, manuals, letters, notes, notebooks,
reports, financial statements, business plans, projections, data base, or
documents, materials or information in Employee's possession or control
containing or describing any Confidential Information (as defined below) or
otherwise relating to Employer or any of its subsidiaries or affiliates.

         6. In exchange for the Severance Benefits, Employee and her heirs,
representatives, executors, successors and assigns (collectively, the
"Releasors"), acquit, release and forever discharge MasTec and its agents,
servants, officers, directors, shareholders, employees, predecessors,
subsidiaries, affiliates, successors, assigns and other representatives
(collectively, the "Released Parties") from all claims, demands, debts, damages,
liabilities, obligations, actions or causes of action, whether known or unknown,
foreseen and unforeseen, fixed, accrued or contingent, liquidated or
unliquidated, matured or unmatured, direct or derivative or consequential,
arising from contract, tort, statute, regulation or otherwise (collectively,
"Claims"), including, without limitation (a) Claims for fraud, intentional
misconduct, simple or gross negligence, criminal conduct, slander or libel, (b)
Claims in connection with Employee's employment (including wrongful termination,
breach of express or implied contract, unpaid wages, accrued vacation, holidays
or sick days, employee benefits, or under any federal, state, or local
employment laws, regulations, or executive orders prohibiting discrimination of
any kind, including discrimination on the basis of age, race, sex, sexual
preference, marital status, national origin, religion, handicap, and disability
discrimination, such as the Age Discrimination in Employment Act, Title VII of
the Civil Rights Act of 1964, the Civil Rights Act of 1866, the Employee
Retirement Income Security Act of 1974, the Americans with Disabilities Act of
1990, the Family and Medical Leave Act, and Florida's Civil Rights Act, and (c)
any other Claim of any kind whatsoever, arising out of, resulting from or in any
way connected with any act, omission, fact, event, occurrence, matter,
agreement, happening, representation, warranty, promise or transaction of any
kind that the Releasors ever had or may now have against the Released Parties,
from the beginning of time to the date of this Agreement. Employee is not
releasing any right or claims he may have personally against Carolyn Kaba or to
any

                                      -2-
<PAGE>

Director and Officer Liability protection to which he may be entitled as a
result of his employment as a corporate officer of MasTec..

         7. In exchange for the Severance Benefits:

                  (a) Employee acknowledges and agrees that the Company's and
its subsidiary and affiliated companies' (collectively, the "COMPANIES")
telecommunications infrastructure services businesses (the "BUSINESS") are
conducted throughout the United States of America and the Commonwealth of
Canada. Until two (2) years following the Separation Date and within the United
States of America and the Commonwealth of Canada (including their possessions,
protectorates and territories, the "Territory"), Employee will not (whether or
not then employed by the Company for any reason), without the Company's prior
written consent:

                           (i) directly or indirectly own, manage, operate,
control, be employed by, act as agent, consultant or advisor for, or participate
in the ownership, management, operation or control of, or be connected in any
manner through the investment of capital, lending of money or property,
rendering of services or otherwise, with, any business of the type and character
engaged in and competitive with the Business. For these purposes, ownership of
securities of one percent (1%) or less of any class of securities of a public
company will not be considered to be competition with the Business;

                           (ii) solicit, persuade or attempt to solicit or
persuade or cause or authorize directly or indirectly to be solicited or
persuaded any existing customer or client, or potential customer or client to
which the Companies have made a presentation or with which the Companies have
been having discussions, to cease doing business with or decrease the amount of
business done with or not to hire the Companies, or to commence doing Business
with or increase the amount of Business done with or hire another company;

                           (iii) solicit, persuade or attempt to solicit or
persuade or cause or authorize directly or indirectly to be solicited or
persuaded the business of any person or entity that is a customer or client of
the Companies, or was their customer or client within two (2) years prior to
cessation of Employee's employment by any of the Companies or any of their
subsidiaries, for the purpose of competing with the Business; or

                           (iv) solicit, persuade or attempt to solicit or
persuade, or cause or authorize directly or indirectly to be solicited or
persuaded for employment, or employ or cause or authorize directly or indirectly
to be employed, on behalf of Employee or any other person or entity, any
individual who is or was at any time within six (6) months prior to cessation of
Employee's employment by the Companies, an employee of any of the Companies.

         If Employee breaches or violates any of the provisions of this SECTION
7, the running of the Period of Non-Competition (but not of any of Employee's
obligations under this SECTION 7) will be tolled with respect to Employee during
the continuance of any actual breach or violation. In addition to any other
rights or remedies the Company may have under this Agreement or applicable law,
the Company will be entitled to receive from Employee reimbursement for all
attorneys' and paralegal fees and expenses and court costs incurred by the
Companies in enforcing this Agreement and will have the right and remedy to
require Employee to account for and pay over to the Company all

                                      -3-
<PAGE>

compensation, profits, monies, accruals or other benefits derived or received,
directly or indirectly, by Employee from the action constituting a breach or
violation of this SECTION 7.

                  b. Telecommunications operators (such as Sprint, MCI, AT&T)
cable companies and other non construction or installation customers of the
Company shall not be considered engaged in and competitive with the Business.

         8. Employee permanently, unequivocally and unconditionally waives any
and all rights Employee may have, may have had in the past, or may have in the
future to seek, obtain or resume employment with Employer. Employee further
understands that Employer is under no obligation, presently or at any time in
the future, to accept Employee as an employee and Employer may deny employment
to Employee solely based upon this Agreement.

         9. Employee represents and warrants that no person other than
signatories hereto had or has any interest in the matters referred to in this
Agreement, that Employee has the sole right and exclusive authority to execute
this Agreement, and that Employee has not sold, assigned, transferred, conveyed,
or otherwise disposed of any claim or demand relating to any matter covered by
this Agreement.

         10. Employee agrees to indemnify and hold Employer harmless from and
against any and all claims, including Employer's court costs and attorneys' fees
arising from or in connection with any claim, action, or other proceeding made,
brought, or prosecuted, or caused or permitted to be commenced or prosecuted, by
Employee, Employee's successor(s), or assign(s) contrary to the provisions of
the Agreement. It is further agreed that this Agreement will be deemed breached
and a cause of action accrued thereon immediately upon the commencement of any
action contrary to this Agreement, and in any such action this Agreement may be
pleaded by the Employer, or any of them, both as a defense and as a counterclaim
or cross-claim in such action. This paragraph shall not apply to actions brought
pursuant to the Age Discrimination in Employment Act ("ADEA") or the Older
Workers Benefit Protection Act ("OWBPA").

         11. Employee agrees that all matters relating to this Agreement are
strictly confidential and that Employee and/or Employee's attorney will not
disclose or disseminate any information concerning any term or terms hereof to
any third person or persons. Any disclosure or dissemination by Employee will be
regarded as a breach of this Agreement and a cause of action will immediately
accrue for damages, including, but not limited to, the amount paid to Employee
under this Agreement.

         12. Employee acknowledges that as a result of Employee's employment
with Employer, Employee has gained knowledge of, and access to, proprietary and
confidential information and trade secrets of Employer and its subsidiaries and
affiliates, including, without limitation, (1) the identity of customers,
suppliers, subcontractors and others with whom they do business; (2) their
marketing methods and strategies; (3) contract terms, pricing, margin, cost
information and other information regarding the relationship between them and
the persons and entities with which they have contracted; (4) their services,
products, software, technology, developments, improvements and methods of
operation; (5) their results of operations, financial condition, projected
financial performance, sales and profit performance and financial requirements;
(6) the identity of and compensation paid to their employees, including
Employee; (7) their business plans, models or strategies and the information
contained therein; (8) their sources, leads or methods of obtaining new
business; and (9) all other confidential information of, about or concerning the
business of Employer and its subsidiaries and affiliates (collectively, the
"Confidential Information"). Employee further acknowledges that such
information, even though it may be contributed, developed or acquired by
Employee, and whether or not the foregoing information is actually novel or
unique or is actually known by others, constitutes valuable assets of Employer
developed at great expense which are the

                                      -4-
<PAGE>

exclusive property of Employer or its subsidiaries and affiliates. Accordingly,
Employee will not, at any time, either during or subsequent to the Term, in any
fashion, form or manner, directly or indirectly, (i) use, divulge, disclose,
communicate, provide or permit access to any person or entity, any Confidential
Information of any kind, nature or description, or (ii) remove from Employer's
or its subsidiaries' or affiliates' premises any notes or records relating
thereto, or copies or facsimiles thereof (whether made by electronic,
electrical, magnetic, optical, laser acoustic or other means) except in the case
of both (i) and (ii), (A) as reasonably required in the performance of
Employee's services to Employer under this Agreement, (B) to responsible
officers and employees of Employer who are in a contractual or fiduciary
relationship with Employer and who have a need for such information for purposes
in the best interests of Employer, and (C) for such information which is or
becomes generally available to the public other than as a result of an
unauthorized disclosure by Employee. Employee acknowledges that Employer would
not enter into this Agreement without the assurance that all Confidential
Information will be used for the exclusive benefit of Employer.

         13. The prevailing party will be entitled to any attorneys' fees and
court costs incurred in enforcing this Agreement or in defending any claim
brought in violation hereof, except that this Paragraph shall not apply to
actions brought pursuant to the Age Discrimination in Employment Act ("ADEA") or
the Older Workers Benefit Protection Act ("OWBPA").

         14. Employee fully understands that if any fact with respect to which
this Agreement is executed is found hereafter to be other than or different from
the facts in that connection now believed by Employee to be true, he expressly
accepts and assumes the risk of such possible difference in fact and agrees that
this Agreement will be and remain effective notwithstanding such difference in
fact.

         15. Employee represents and agrees that he has not and will not make or
file or cause to be made or filed any claim, charge, allegation, or complaint,
whether formal, informal, or anonymous, with any governmental agency, department
or division, whether federal, state, or local, relating to Employer in any
manner, including without limitation, Employer's business or employment
practices.

         16. Employee agrees that he will not make any statements about or
relating to MasTec or its affiliates, its officers, directors, shareholders,
agents or independent contractors which are disparaging, critical or likely to
cause embarrassment. In the event Employee becomes employed by a customer of the
Company, Employee agrees not to directly or indirectly negatively impact the
Company's relationship with said customer. MasTec shall not make any statements
about or relating to Employee that are disparaging, critical or likely to cause
embarrassment.

         17. Employee acknowledges that violation of the Agreement may give rise
to irreparable injury to Employer, inadequately compensable in damages.
Accordingly, Employer may seek and obtain injunctive relief against the breach
or threatened breach of the foregoing, in addition to any other legal remedies
which may be available and which legal remedies are not waived by Employer's
seeking injunctive relief. Employer acknowledges and agrees that the covenants
contained herein are necessary for the protection of Employer's legitimate
business interests.

         18. Pursuant to the provisions of the Older Workers Benefit Protection
Act (OWBPA), which applies to Employee's waiver of rights under the Age
Discrimination in Employment Act, Employee has had a period of at least
twenty-one (21) days within which to consider whether to execute this Agreement
.. Also pursuant to the OWBPA, Employee may revoke the Agreement within seven (7)
days of its execution. It is specifically understood that this Agreement will
not become effective or enforceable until the seven-day revocation period has
expired. Consideration for this Agreement will not be paid until the end of the
seven-day revocation period or, if paid before the expiration of the seven-day
revocation period, must be refunded in full to revoke this Agreement.

                                      -5-
<PAGE>

         19. Employee acknowledges that, pursuant to the OWBPA, Employer advised
Employee, in writing, to consult with an attorney prior to executing this
Agreement.

         20. This Agreement does not constitute an admission of a violation of
any law, order, regulation, or enactment, or of wrongdoing of any kind by
Employer and is entered into by the parties solely to end any controversy
between them. This Agreement will be governed by and construed and enforced in
accordance with the laws of the State of Florida, without regard to its conflict
of laws rules. The parties agree to submit any claims arising from a breach of
this Agreement, other than those by MasTec claiming a breach of paragraph 7 for
which MasTec shall have the right to seek injunctive relief in state or federal
Court in Miami-Dade County, to binding arbitration with the American Arbitration
Association ("AAA") in Miami, Florida in accordance with the National Rules for
the Resolution of Employment Disputes in effect at the time of filing (the
"Employment Rules") as modified by the following:

         (a)      the parties agree to use one arbitrator.

         (b)      if the parties cannot agree on the choice of the sole
                  arbitrator within ten (10) calendar days of the service of a
                  demand for arbitration, the parties shall select the sole
                  arbitrator in accordance with the procedures set for in AAA's
                  Employment Rules.

         (c)      the parties agree that document production requests are an
                  appropriate form of discovery and that each side will be
                  entitled to take up to six (6) depositions (including
                  deposition of experts, if any). The parties specifically
                  modify the Employment Rules to eliminate all other forms of
                  discovery.

         (d)      the parties agree to limit the total number of witnesses to be
                  called at trial (including expert witnesses, if any) to a
                  total of seven (7) per side.

This provision is a material inducement for Employer to enter into this
Agreement with Employee.

         21. The waiver by Employer in writing of any provision of this
Agreement will in no manner affect the right to enforce the same, and will not
be construed to be a waiver by Employer of any succeeding breach of such
provision or a waiver of any breach of any other provision.

         22. This Agreement represents the entire understanding and agreement
between the parties hereto with respect to the subject matter hereof and there
are no promises, agreements, conditions, undertakings, warranties, or
representations, whether written or oral, express or implied, between the
parties other than as set forth herein. This Agreement cannot be amended,
supplemented, or modified except by an instrument in writing signed by the
parties against whom enforcement of such amendment, supplement or modification
is sought. Employee will make no claim and waives any right Employee may now
have or may hereafter have based upon any alleged oral alteration, amendment,
modification, or any other alleged change in this Agreement.

         23. Employee will respond to all reasonable requests for advice and
consultation regarding business matters on which Employee has knowledge or
information arising from Employee's employment with Employer and will be
reimbursed by MasTec for all reasonable expenses associated with any such
cooperation. In addition, Employee agrees to provide information and participate
in litigation or other proceedings involving Employer now or in the future, as
reasonably requested by Employer or its legal counsel. Prior to the Separation
Date such assistance and response will be without charge to MasTec. After the
Separation Date the Parties will agree to the compensation to be paid to
Employee.

         24. EMPLOYEE FURTHER STATES THAT HE HAS CAREFULLY READ THIS AGREEMENT,
IT HAS BEEN FULLY EXPLAINED TO HIM, THAT HE HAS HAD THE OPPORTUNITY TO HAVE IT
REVIEWED BY AN ATTORNEY, AND THAT HE FULLY UNDERSTANDS ITS FINAL AND BINDING
EFFECT, AND THAT THE ONLY PROMISES MADE TO HER TO SIGN THE AGREEMENT ARE THOSE
STATED IN THE AGREEMENT,

                                      -6-
<PAGE>

AND THAT EMPLOYEE IS SIGNING THIS AGREEMENT VOLUNTARILY WITH THE FULL INTENT OF
RELEASING EMPLOYER OF ALL CLAIMS.

25. EMPLOYEE KNOWINGLY, VOLUNTARILY, IRREVOCABLY, UNCONDITIONALLY AND
INTENTIONALLY WAIVES THE RIGHT TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION
BASED ON, ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS AGREEMENT OR ANY
CLAIMS COVERED BY THIS AGREEMENT, OR ANY COURSE OF CONDUCT, COURSE OF DEALINGS,
STATEMENTS (WHETHER VERBAL OR WRITTEN) OR ACTIONS OF ANY PERSON OR PARTY AND
RELATED TO THIS AGREEMENT OR ANY CLAIMS; THIS IRREVOCABLE WAIVER OF THE RIGHT TO
A JURY TRIAL BEING A MATERIAL INDUCEMENT FOR EMPLOYER TO ENTER INTO THIS
AGREEMENT.

         EXECUTED: as of March 22, 2004.

                                     /s/ Eric Tveter
                                     -------------------------------------------
                                     Eric Tveter

                                     MASTEC, INC.

                                     By: /s/ Austin J. Shanfelter
                                         ---------------------------------------
                                         Austin J. Shanfelter, President and CEO

                                      -7-

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