NEWS
For Immediate Release                  From MasTec, Inc.
August 27, 1997                                 3155 N.W. 77th Avenue, Suite 110
                                                Miami, Florida 33122-1205
                                                Tel :    (305) 599-1800
                                                Fax :    (305) 406-1908
                                                For more information contact:
                                                Edwin D. Johnson,
                                                Chief Financial Officer
                                                ejohnson@mastec.com


                        MASTEC PARTNERS WITH MACRI GROUP

MIAMI, FL - MasTec,  Inc. (NYSE:  MTZ) announced today that the Macri Group, one
of the largest commercial groups in Argentina, has agreed to be MasTec's new 50%
partner in Sintelar, S.A., MasTec's Argentinean telecommunications  construction
subsidiary.  Iecsa S.A., a subsidiary of SOCMA-Sociedad  Macri, will acquire the
50% interest  for cash and Iecsa's  existing  telecommunications  infrastructure
business,  which will be merged into Sintelar.  The agreement between MasTec and
the Macri Group also  provides  that the two  companies  will pursue  additional
opportunities throughout South America.

SOCMA-Sociedad  Macri  is  one  of  the  leading  construction  and  engineering
conglomerates  in South  America,  with more than $3.5  billion in  revenue  and
25,000  employees.  The group has built more than 3,000  kilometers of roads and
highways, 12 dams, various hydroelectric,  thermal and nuclear energy plants and
extensive telecommunications and natural gas distribution networks. The group is
currently the largest toll road and highway concessionaire in Argentina. Through
other  subsidiaries,  SOCMA-Sociedad  Macri also  manufactures  automobiles  for
Peugeot  and  Fiat,  provides  systems  integration  services,   cellular  phone
services,  and  produces  and  distributes  frozen  foods.  The Macri  Group was
recently  awarded a thirty year contract to operate the National Postal services
in Argentina,  assuming responsibility for 20,000 postal employees in over 6,500
locations throughout the country.

Jorge  Mas,  President  and Chief  Executive  Officer of  MasTec,  stated:  "The
restructuring  of our strategic  alliances in Argentina brings us a powerful new
partner  in the  pursuit  of the  tremendous  expansion  opportunities  that  we
continue to see in Latin America.  The Macri Group and Inepar, our joint venture
partner in Brazil, are two of the preeminent companies strategically  positioned
to capitalize on the opportunities being presented in the Mercosur countries."

Opening the Lines of  Communication(R)  worldwide,  MasTec is one of the world's
leading telecommunications and related infrastructure service providers, serving
clients  throughout  the  United  States,  Latin  America  and  Spain.  For more
information on MasTec, please see our web page at http://www.mastec.com.


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NEWS
For Immediate Release                  From MasTec, Inc.
September 3, 1997                               3155 N.W. 77th Avenue, Suite 135
                                                Miami, Florida 33122-1205
                                                Tel :    (305) 599-1800
                                                Fax :    (305) 406-1908
                                                For more information contact:
                                                Edwin D. Johnson,
                                                Chief Financial Officer
                                                ejohnson@mastec.com


                      MASTEC FILES LABOR PETITION IN SPAIN

         MIAMI,  FLORIDA - MasTec,  Inc.  (NYSE:MTZ)  announced  today  that its
Spanish subsidiary,  Sintel,  S.A., has petitioned the Spanish labor authorities
to approve a restructuring  of Sintel's work force.  The proposed  restructuring
would  result in  approximately  1,400 of Sintel's  workers  being  removed from
payroll  and  approximately   1,200  being  rehired  at  lower  cost  either  as
independent  contractors or as employees of other Sintel  non-union  affiliates.
The petition only involves union workers  principally in Sintel's  outside plant
division  servicing  Telefonica de Espana,  which workers  currently account for
less than fifty percent of that division's revenue.

         The  proposed  restructuring  is modeled  after a  tentative  agreement
reached by Sintel and its labor unions in October 1996. The tentative  agreement
was not  implemented  because one of Sintel's  three  unions  failed to sign the
definitive  contract.  Sintel and its labor unions are currently operating under
the terms of a 1993  labor  agreement.  Since  acquiring  Sintel in April  1996,
MasTec  has  reduced  Sintel's  labor  force,   principally   through  voluntary
terminations,  by approximately  200 workers.  The Company expects a response to
the petition within the next 45 days.

         Jorge Mas, President and Chief Executive Officer,  said: "This petition
continues  our  efforts to enhance  shareholder  value by  improving  margins on
outside plant  services to  Telefonica.  The petition  does not affect  Sintel's
other  divisions or our strategy to diversify our customer base in Spain,  which
is being pursued by non-union affiliates."

         Opening the Lines of Communication(C)  worldwide,  MasTec is one of the
world's leading telecommunications and related infrastructure service providers,
serving clients throughout the United States,  Latin America and Spain. For more
information on MasTec, please see our Web page at http://www.mastec.com.

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NEWS
For Immediate Release                 From MasTec, Inc.
September 10, 1997                             3155 N.W. 77th Avenue, Suite 135
                                               Miami, Florida 33122-1205
                                               Tel :    (305) 599-1800
                                               Fax :    (305) 406-1908
                                               For more information contact:
                                               Edwin D. Johnson,
                                               Chief Financial Officer
                                               ejohnson@mastec.com


                   MASTEC ANNOUNCES ACQUISITION OF AIDCO, INC.

MIAMI, FL - MasTec,  Inc. (NYSE:  MTZ) announced today the acquisition of AIDCO,
Inc. of Chino, California, a company engaged in the installation and maintenance
of voice,  data and video  local-area  and wide-area  networks.  AIDCO  operates
primarily  in the  Western  and  Midwestern  states  and  is  one of two  master
resellers of Sumitomo  Electric  Lightwave  FutureFlex(R)  air-blown fiber optic
cabling systems, providing technical support and product delivery throughout the
United States,  Canada, and Mexico. For more information on AIDCO,  please visit
the AIDCO web site at http://www.aidco.com.

Opening the Lines of  Communication(R)  worldwide,  MasTec is one of the world's
leading telecommunications and related infrastructure service providers, serving
clients  throughout  the  United  States,  Latin  America  and  Spain.  For more
information on MasTec, please see our Web page at http://www.mastec.com.

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