As filed with the Securities and Exchange Commission on July 31, 1998.
                                                       Registration No. 33-55327
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                 --------------
                        POST-EFFECTIVE AMENDMENT NO. 1 TO
                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                 --------------
                                  MASTEC, INC.
             (Exact name of registrant as specified in its charter)
                                 --------------

                  FLORIDA                                  65-0829355
      (State or other jurisdiction of                   (I.R.S. Employer
      incorporation or organization)                   Identification No.)

                              3155 N.W. 77TH AVENUE
                              MIAMI, FL 33122-1205
                                 (305) 599-1800
               (Address, including zip code, and telephone number,
        including area code, of registrant's principal executive offices)

                                 --------------

                                THE MASTEC, INC.
                         401(K) RETIREMENT SAVINGS PLAN
                                ---------------
                              (Full Title of Plans)

                              JOSE M. SARIEGO, ESQ.
                     SENIOR VICE PRESIDENT - GENERAL COUNSEL
                                  MASTEC, INC.
                              3155 N.W. 77TH AVENUE
                              MIAMI, FL 33122-1205
                                 (305) 599-2314
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   COPIES TO:
                              STEVEN D. RUBIN, ESQ.
                         STEARNS WEAVER MILLER WEISSLER
                           ALHADEFF & SITTERSON, P.A.
                       150 WEST FLAGLER STREET, SUITE 2200
                              MIAMI, FLORIDA 33130
                                 (305) 789-3517
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                                  MASTEC, INC.

         On March 29, 1998, MasTec, Inc. was reincorporated from a Delaware
corporation to a Florida corporation. This post-effective amendment is being
filed pursuant to Rule 414 under the Securities Act of 1933, as amended (the
"Act"), so that MasTec, Inc., a Florida corporation, may expressly adopt this
Registration Statement of MasTec, Inc., a Delaware corporation, its predecessor,
as its own registration statement for all purposes of the Act and the Securities
Exchange Act of 1934, as amended.




                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 6.           INDEMNIFICATION OF DIRECTORS AND OFFICERS.

                  Section 607.0831 of the Florida Business Corporation Act (the
"Florida Act") provides that a director is not personally liable for monetary
damages to the corporation or any person for any statement, vote, decision or
failure to act regarding corporate management or policy, by a director, unless:
(a) the director breached or failed to perform his duties as a director; and (b)
the director's breach of, or failure to perform, those duties constitutes: (i) a
violation of criminal law unless the director had reasonable cause to believe
his conduct was lawful or had no reasonable cause to believe his conduct was
unlawful; (ii) a transaction from which the director derived an improper
personal benefit, either directly or indirectly; (iii) a circumstance under
which the director is liable for an improper distribution; (iv) in a proceeding
by, or in the right of the corporation to procure a judgment in its favor or by
or in the right of a shareholder, conscious disregard for the best interests of
the corporation, or willful misconduct; or (v) in a proceeding by or in the
right of someone other than the corporation or a shareholder, recklessness or an
act or omission which was committed in bad faith or with malicious purpose or in
a manner exhibiting wanton and willful disregard of human rights, safety or
property.

                  Section 607.0850 of the Florida Act provides that a
corporation shall have the power to indemnify any person who was or is a party
to any proceeding (other than an action by, or in the right of, the
corporation), by reason of the fact that he is or was a director, officer or
employee or agent of the corporation, against liability incurred in connection
with such proceeding if he acted in good faith and in a manner he reasonably
believed to be in, or not opposed to, the best interests of the corporation and,
with respect to any criminal action or proceeding, had no reasonable cause to
believe his conduct was unlawful. Section 607.0850 also provides that a
corporation shall have the power to indemnify any person, who was or is a party
to any proceeding by, or in the right of, the corporation to procure a judgment
in its favor by reason of the fact that he is or was a director, officer,
employee or agent of the corporation, against expenses and amounts paid in
settlement not exceeding, in the judgment of the board of directors, the
estimated expense of litigating the proceeding to conclusion, actually and
reasonably incurred in connection with the defense or settlement of such
proceeding, including any appeal thereof. Section 607.0850 further provides that
such indemnification shall be authorized if such person acted in good faith and
in a manner he reasonably believed to be in, or not opposed to, the best
interests of the corporation, except that no indemnification shall be made under
this provision in respect of any claim, issue, or matter as to which such person
shall have been adjudged to be liable unless, and only to the extent that, the
court in which such proceeding was brought, or any other court of competent
jurisdiction, shall determine upon application that, despite the adjudication of
liability, but in view of all circumstances of the case, such person is fairly
and reasonably entitled to indemnity for such expenses which such court shall
deem proper. Section 607.0850 further provides that to the extent that a
director, officer, employee or agent has been successful on the merits or
otherwise in defense of any of the foregoing proceedings, or in defense of any
claim, issue or matter therein, he shall be indemnified against expenses
actually and

                                      II-1



reasonably incurred by him in connection therewith. Under Section 607.0850, any
indemnification under the foregoing provisions, unless pursuant to a
determination by a court, shall be made by the corporation only as authorized in
the specific case upon a determination that the indemnification of the director,
officer, employee or agent is proper under the circumstances because he has met
the applicable standard of conduct. Notwithstanding the failure of a corporation
to provide such indemnification, and despite any contrary determination by the
corporation in a specific case, a director, officer, employee or agent of the
corporation who is or was a party to a proceeding may apply for indemnification
to the appropriate court and such court may order indemnification if it
determines that such person is entitled to indemnification under the applicable
standard.

                  Section 607.0850 also provides that a corporation shall have
the power to purchase and maintain insurance on behalf of any person who is or
was a director, officer, employee or agent of the corporation against any
liability asserted against him and incurred by him in any such capacity or
arising out of his status as such, whether or not the corporation would have the
power to indemnify him against such liability under the provisions of Section
607.0850.

                  The Registrant's Amended and Restated Certificate of
Incorporation provides that the Registrant shall indemnify to the fullest extent
authorized by the Florida Act, each person who is involved in any litigation or
other proceeding because such person is or was a director or officer of the
Registrant, against all expense, loss or liability reasonably incurred or
suffered in connection therewith. The Registrant's Bylaws provide that a
director or officer may be paid expenses incurred in defending any proceeding in
advance of its final disposition upon receipt by the Registrant of an
undertaking, by or on behalf of the director or officer, to repay all amounts so
advanced if it is ultimately determined that such director or officer is not
entitled to indemnification.

                  The Registrant has obtained primary and excess insurance
policies insuring the directors and officers of the Registrant and its
subsidiaries against certain liabilities they may incur in their capacity as
directors and officers. Under such policies, the insurer, on behalf of the
Registrant, may also pay amounts for which the Registrant has granted
indemnification to the directors or officers.

Item 8.           EXHIBITS.

                  The following exhibits are either filed herewith or have been
previously filed as indicated below:

EXHIBIT
NUMBER      DESCRIPTION

5.1         Opinion of Stearns Weaver Miller Weissler Alhadeff & Sitterson P.A.

23.1        Consent of Coopers & Lybrand L.L.P.*


                                      II-2



23.2        Consent of Arthur Andersen L.L.P.*

23.3        Consent of Stearns Weaver Miller Weissler Alhadeff & Sitterson P.A.
            (included in Exhibit 5.1 above)

24.1        Power of Attorney*

27.1        Financial Data Schedule*
- -------------------
*Previously filed

                                      II-3



                                   SIGNATURES

                Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has duly caused this Amendment to its Registration
Statement on Form S-8 to be signed on its behalf by the undersigned, thereunto
duly authorized in the City of Miami, State of Florida on the 31st day of July,
1998.

                        MASTEC, INC.

                        By: /S/ STEPHEN D. DANIELS
                            ----------------------------------------------------
                            Stephen D. Daniels
                            Senior Vice President - Chief Financial Officer
                            (Principal Financial and Accounting Officer)

         Pursuant to the requirements of the Securities Act of 1933, this
Amendment to the Registration Statement has been signed by the following persons
in the capacities and on the dates indicated.
SIGNATURE TITLE DATE /S/ Jorge Mas Chairman of the Board of Directors, July 31, 1998 - ---------------------------------- President and Chief Executive Officer Jorge Mas (Principal Executive Officer) * - ---------------------------------- Director July 31, 1998 Eliot C. Abbot * - ---------------------------------- Director July 31, 1998 Arthur B. Laffer * - ---------------------------------- Director July 31, 1998 Jose S. Sorzano *By: /s/ Jose M. Sariego - ---------------------------------- (Attorney-in-Fact pursuant to Power of Attorney)
II-4 EXHIBIT INDEX EXHIBIT NUMBER DESCRIPTION 5.1 Opinion of Stearns Weaver Miller Weissler Alhadeff & Sitterson, P.A. 23.3 Consent of Stearns Weaver Miller Weissler Alhadeff & Sitterson, P.A. (included in Exhibit 5.1 above). II-5
                                                                     EXHIBIT 5.1

                                  LAW OFFICES
           STEARNS WEAVER MILLER WEISSLER ALHADEFF & SITTERSON, P.A.
                            MUSEUM TOWER, SUITE 2200
                            150 WEST FLAGLER STREET
                              MIAMI, FLORIDA 33130
                                    --------
                   MIAMI (305) 789-3200 BROWARD (954) 462-9500
                               FAX (305) 789-3395



                                  July 31, 1998

Mr. Jose M. Sariego
Senior Vice President - General Counsel
MasTec, Inc.
3155 N.W. 77th Avenue
Miami, Florida 33122-1205

                  Re:      MasTec, Inc.
                           AMENDMENT NO.1 TO FORM S-8

Dear Mr. Sariego:

         As counsel to MasTec, Inc., a Florida corporation (the "Corporation"),
we have examined the Articles of Incorporation and Bylaws of the Corporation, as
well as such other documents and proceedings as we have considered necessary for
the purposes of this opinion. We have also examined and are familiar with the
(1) Corporation's Registration Statement on Form S-8 (the "Registration
Statement"), filed with the Securities and Exchange Commission under the
Securities Act of 1933, as amended, relating to 500,000 additional shares of the
Corporation's common stock, par value $.10 per share (the "Common Stock"),
issuable by the Corporation pursuant to The MasTec, Inc. 401(k) Retirement Plan
(the "Plan"), and (2) the Prospectus (the "Prospectus") relating to the
Registration Statement, providing, among other things, information concerning
the Plan.





Mr. Jose M. Sariego
July 31, 1998

Page 2

         In rendering this opinion, we have assumed, without independent
investigation: (i) the authenticity of all documents submitted to us as
originals; (ii) the conformity to original documents of all documents submitted
to us as certified or photostatic copies and (iii) the genuineness of all
signatures. In addition, as to questions of fact material to the opinions
expressed herein, we have relied upon such certificates of public officials,
corporate agents and officers of the Corporation and such other certificates as
we deemed relevant.

         Based upon the foregoing, and having regard to legal considerations
which we deem relevant, we are of the opinion that following the issuance and
delivery of the Common Stock by the Corporation under the Plan, against payment
of adequate consideration therefor to the Corporation in accordance with the
terms of the Plan and Prospectus, the Common Stock will be validly issued, fully
paid and non-assessable.

         This opinion is intended solely for the Corporation's use in connection
with the registration of the Common Stock and may not be relied upon for any
other purpose or by any other person. This opinion may not be quoted in whole or
in part or otherwise referred to or furnished to any other person except in
response to a valid subpoena. This opinion is limited to the matters expressly
stated herein, and no opinion is implied or may be inferred beyond the matters
expressly stated herein. This opinion is rendered as of the date hereof, and we
assume no obligation to update or supplement such opinion to reflect any facts
or circumstances that may hereafter come to our attention or any changes in
facts or law that may hereafter occur. We hereby consent to the inclusion of
this opinion letter as an exhibit to the Registration Statement.

                                            Very truly yours,

                                            STEARNS WEAVER MILLER WEISSLER
                                            ALHADEFF & SITTERSON, P.A.