MASTEC INC
10-K, 1999-04-01
WATER, SEWER, PIPELINE, COMM & POWER LINE CONSTRUCTION
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-K

                  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                   For the fiscal year ended December 31, 1998

                          Commission File Number 0-3797



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

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

3155 N.W. 77th Avenue, Miami, FL 33122-1205              (305) 599-1800
(Address of principal executive offices)          Registrant's telephone number,
                                                       including area code

           Securities registered pursuant to Section 12(b) of the Act:

                                                        Name of each exchange on
Title of each class                                        which registered

Common Stock, $.10 Par Value                           New York Stock Exchange

        Securities registered pursuant to Section 12(g) of the Act: None

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934 during the preceding 12 months (or for such period that the  registrant was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes X No .

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of  registrant's  knowledge in definitive  proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. __

     The number of shares of Common Stock  outstanding  as of March 26, 1999 was
27,341,385.   The   aggregate   market   value  of  the  voting  stock  held  by
non-affiliates  of the  registrant  based on the $22 5/8  closing  price for the
registrant's  Common Stock on the New York Stock  Exchange on March 26, 1999 was
approximately  $304,703,626.  Directors,  executive  officers and 10% or greater
shareholders  are  considered  affiliates for purposes of this  calculation  but
should not necessarily be deemed affiliates for any other purpose.

                       DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant's Proxy Statement relating to the 1999 Annual Meeting
of Shareholders to be held on May 25, 1999, are incorporated by reference.

<PAGE>

     The following  statement is made pursuant to the safe harbor provisions for
forward-looking statements described in the Private Securities Litigation Reform
Act of 1995. MasTec, Inc. and subsidiaries  ("MasTec" or the "Company") may make
certain statements in this Annual Report on Form 10-K that are  forward-looking,
such as statements  regarding MasTec's future growth and  profitability,  growth
strategy and anticipated  trends in the industries and economies in which MasTec
operates.  These  forward-looking  statements  are  based  on  MasTec's  current
expectations and are subject to a number of risks, uncertainties and assumptions
relating to MasTec's operations,  financial condition and results of operations,
competitive factors, shifts in market demand, and other risks and uncertainties,
including  risks  and  uncertainties  relating  to  MasTec's  dependence  on key
customers and the telecommunications industry, MasTec's growth strategy, foreign
operations,  restrictions  imposed by MasTec's credit agreements,  the impact of
competition,  MasTec's  dependence on the labor supply and on senior management,
the  ability of MasTec to  dispose of  non-core  assets and  seasonality,  among
others.  Should  one or more of these  risks or  uncertainties  materialize,  or
should the underlying  assumptions  prove  incorrect,  actual results may differ
significantly   from  results  expressed  or  implied  in  any   forward-looking
statements  made by MasTec.  These and other  risks are  detailed in this Annual
Report on Form 10-K and in other  documents  filed by MasTec with the Securities
and Exchange  Commission.  MasTec does not  undertake  any  obligation to revise
these forward-looking statements to reflect future events or circumstances.

                                    BUSINESS

General

     MasTec is one of the  preeminent  builders of internal and external  voice,
video, data, internet and other computer and communications networks for leading
telecommunications  service providers,  cable television operators,  Fortune 500
corporations  and power  companies.  MasTec  designs,  installs,  constructs and
maintains aerial,  underground and buried copper,  coaxial and fiber optic cable
networks as well as wireless antenna  networks  ("external  network  services").
Clients for  MasTec's  external  network  services  include  major  domestic and
international  telecommunication  service  providers,  incumbent and competitive
local exchange carriers, cable television operators,  long-distance carriers and
wireless phone companies.  MasTec also provides external network services to the
electric power  industry  ("power") that are similar to the services it provides
to  telecommunications  customers.  Additionally,  MasTec designs,  installs and
maintains   integrated  local  and  wide  area  networks  and  provides  systems
integration  and other value added services  ("internal  network  services") for
corporate customers and other organizations with multiple locations.

     MasTec was formed in March 1994 through the  combination  of two  companies
providing services to the  telecommunications  and other utility  infrastructure
construction industry since 1969 and 1929. MasTec has grown significantly in the
past five years  expanding its customer base and its geographic  presence across
the United States and Latin America.  Since March 1994,  MasTec has completed 31
domestic and seven foreign acquisitions.  Currently, MasTec is consolidating its
existing  domestic   acquisitions  and  emphasizing  domestic  internal  growth,
although it intends to continue to grow through  selected  acquisitions  to take
advantage of consolidation  opportunities  in the fragmented  telecommunications
and other  utilities  construction  industry  in the  United  States.  MasTec is
currently evaluating strategic alternatives for its international operations and
investments in order to maximize their value. On December 31, 1998,  MasTec sold
substantially all of its operations in Spain, Argentina,  Chile, Colombia, Peru,
Puerto Rico and Venezuela.

     Customers.  MasTec  provides a full range of  infrastructure  services to a
diverse customer base.  Domestically,  MasTec provides external network services
to   incumbent   local   exchange   customers   ("ILEC's")   such  as  BellSouth
Telecommunications,  Inc.  ("BellSouth"),  US West  Communications,  Inc.,  Bell
Atlantic  Corp.,  SBC  Communications,  Inc.  and GTE  Corporation.  MasTec also
provides  external  network  services to  competitive  local  exchange  carriers
("CLEC's") such as Qwest  Communications,  Inc. and MFS Communications  Company,
Inc.,  cable  television  operators  ("CATV's")  such as  Charter  Cable,  Inc.,
Cablevision Systems, Inc., Time Warner Inc., Tele-Communications,  Inc., Comcast
Corporation,  and Cox Communications,  Inc., long distance carriers such as AT&T
Corporation  and Sprint Corp.  and  wireless  communications  providers  such as
Sprint Spectrum, L.P. Internationally, MasTec provides external network services
to the local, long distance and wireless telephone  companies formed as a result
of the  privatization of  Telecomunicacoes  Brasileiras S.A.  ("Telebras"),  the
Brazilian  telecommunications  system,  primarily in Sao Paulo,  Rio de Janeiro,
Parana and other states in the southern region of Brazil.

                                       1
<PAGE>

     MasTec  provides  external  network  services  to power  companies  such as
Carolina  Power and Light  Co.,  Florida  Power and Light Co.,  Texas  Utilities
Company, Virginia Power Co., the City of Austin Electric Department, City Public
Service of San Antonio,  Georgia Power Co., and a number of regional  electrical
cooperatives.  MasTec  provides  internal  network  services to large  corporate
customers with multiple locations such as First Union National Bank,  Montgomery
Wards and Co., other major retailers, universities and health care providers.

     MasTec  believes  that its  customer  base allows it to take  advantage  of
technological advances and other market developments that may favor one class of
customer over another. MasTec also believes that its diverse customer base makes
it less susceptible to downturns in any particular geographic region or industry
sector. For the year ended December 31, 1998, MasTec derived  approximately 6.7%
of its revenue (or 10.6% of its North American revenue) from services  performed
for BellSouth,  its largest customer;  no other on going customer  accounted for
more than 5% of total  revenue.  See Note 9 of Notes to  Consolidated  Financial
Statements.

     Turn-key  Capabilities.  MasTec  believes it is one of the few  contractors
capable  of  providing  all  of  the  design,  construction,   installation  and
maintenance  services  necessary for a cable or wireless network starting from a
transmission  point,  such  as  a  central  office  or  head-end,   and  running
continuously  through aerial,  underground and buried cables or through wireless
transmission  to the ultimate end users' voice and data ports,  cable outlets or
cellular  stations.  MasTec can also install the switching  devices at a central
office or set up local and wide area voice, video, data and internet networks to
expand a  business'  telecommunications  infrastructure  both  inside a specific
structure or between multiple structures.

     MasTec believes that its customers  increasingly are seeking  comprehensive
solutions  to  their   infrastructure   needs  by  turning  to  fewer  qualified
contractors who have the size,  financial  capability and technical expertise to
provide a full range of infrastructure services. MasTec believes that this trend
will accelerate as industry  consolidations  increase and as these  consolidated
entities begin to provide bundled services to end users.  MasTec believes it has
positioned  itself as a full service  provider of external and internal  network
services to take advantage of this trend.

     Nationwide  Presence.  MasTec believes it is capable of servicing customers
across the United  States.  MasTec has  significantly  broadened its  geographic
presence in recent years beyond its historical base in the  Southeastern  United
States. Currently, MasTec has external network operations in more than 40 states
in the Southeast,  Northeast,  mid-Atlantic,  Southwest,  West and upper Midwest
regions of the country.  MasTec provides internal network services for corporate
customers and external  network  services for wireless  communication  companies
nationwide.  MasTec  believes that its customers are looking for contractors who
can  provide  services  nationwide  on a  consistent  and timely  basis and that
MasTec's  broad  geographic  presence  is a  competitive  advantage  with  these
customers.  MasTec is  developing  the brand  name  "MasTec"  across  all of its
operating  units  nationwide to further  position  itself as a single,  national
company.

Growth Strategy

     Internal Expansion. MasTec believes that current industry trends, including
deregulation    and     demonopolization,     increased     competition    among
telecommunications  and other  utility  providers,  increased  outsourcing,  and
increased  use of more  powerful  computers  and the  Internet,  will  lead to a
significant increase in the demand for its services over the next several years.
During 1998,  MasTec  realigned its North American  operations along service and
customer   lines  to  focus  on  its  core   businesses   and   believes  it  is
well-positioned  to capitalize on this anticipated  growth as one of the leading
telecommunications  infrastructure  contractors  in the  United  States.  MasTec
believes  that its strong  customer  relationships,  reputation  for quality and
reliability,  operating  efficiency,  financial strengths,  technical expertise,
presence  in  key  geographic  areas  and  ability  to  offer  a full  range  of
construction  services  make it well  positioned  to compete for this  increased
business,  particularly  the larger,  more  technically  complex  infrastructure
projects.

     Strategic  Acquisitions.  MasTec  plans  to  continue  to  pursue  selected
acquisitions in the fragmented  telecommunications and utilities  infrastructure
industry that either expand its geographic coverage and customer base or broaden
the range of services it can offer to clients.  MasTec  focuses its  acquisition
efforts  primarily on  profitable  companies  with good  reputations  and strong
management. MasTec has acquired 38 companies, domestic and international,  since
March  1994  and has  significant  experience  in  identifying,  purchasing  and
integrating  telecommunications  infrastructure businesses. MasTec believes that
it is able to improve the acquired companies' operating performance by providing
strategic  guidance,  administrative  support,  greater  access to  capital  and
savings in the cost of capital, purchasing and insurance costs.

                                       2
<PAGE>

North American Service Lines

     MasTec's  principal  business  is  providing  telecommunications  and other
utilities infrastructure  construction services,  consisting of external network
services for telecommunications service providers, external network services for
power companies, and internal network services. For the years ended December 31,
1996, 1997 and 1998, revenue expressed as a percentage of North American revenue
generated by external network services for telecommunications  service providers
was 77.1%, 74.6% and 68.1%, respectively, by external network services for power
companies  was 1.3%,  5.2% and  18.0%,  respectively,  and by  internal  network
services was 12.5%, 12.5% and 13.4%, respectively.

External Networks - Telecommunications

     MasTec's  principal domestic business consists of external network services
for telecommunications  providers such as ILEC's, CLEC's, CATV's,  long-distance
carriers  and  wireless  communications  providers.  External  network  services
consist of all of the  services  necessary  to design,  install,  construct  and
maintain the physical facilities used to provide telecommunications service from
the  provider's  central  office,  switching  center  or cable  head-end  to the
ultimate  consumer's home or business.  These services include designing conduit
networks and fiber rings; placing and splicing of cable;  excavating trenches in
which to place the cable;  fabricating  and placing  related  structures such as
poles, anchors,  conduits,  manholes,  cabinets and closures; placing drop lines
from  the  main  distribution  terminals  to the  customer's  home or  business;
maintaining,   removing  and  replacing   these   facilities;   and   installing
transmission  and central office  equipment.  MasTec has developed  expertise in
directional  boring,  a highly  specialized  and  increasingly  common method of
placing underground and buried cable networks.

     MasTec provides a full range of external network services to its
telecommunications  company  customers,  although certain of MasTec's  customers
handle certain of these services in-house.  MasTec's customers  generally supply
materials such as cable,  conduit and telephone  equipment,  and MasTec provides
the expertise,  personnel, tools and equipment necessary to perform the required
installation, construction and maintenance services.

     Services rendered to ILEC's,  including BellSouth,  are performed primarily
under  master  service   agreements,   which  typically  are  exclusive  service
agreements to provide all of the carrier's external network requirements up to a
specified dollar amount per job within certain geographic areas. These contracts
generate  revenue  ranging  from  $3.0  million  to  $30.0  million  over  their
respective  contract  terms,  generally two to three years.  Such  contracts are
typically subject to termination at any time upon 90 to 180 days prior notice to
MasTec.  Each master  services  agreement  contemplates  hundreds of  individual
construction  and maintenance  projects  generally  valued at less than $100,000
each. These master services agreement are typically awarded on a competitive bid
basis, although customers are sometimes willing to negotiate contract extensions
beyond their original terms without opening them up to bid. MasTec currently has
43 master service agreements with telecommunications and other utility customers
covering defined regions within the United States, including 10 with BellSouth.

     In addition to services  rendered  pursuant to master  services  agreement,
MasTec provides  external network  services on individual  projects awarded on a
competitive bid basis or through individual negotiation. While such projects are
generally  substantially  larger than the individual  projects covered by master
contracts,  they typically  require  services  identical to those rendered under
master services agreement. Most of MasTec's external network contracts,  whether
master services  agreement or individual  projects,  are based either on a fixed
price  for the  entire  project  or on a unit  price  basis  for  units  of work
performed.  MasTec also  performs  work under  cost-plus  contracts  under which
MasTec is reimbursed  for certain costs plus a fee in a fixed amount or equal to
a  percentage  of  reimbursable   costs.  Many  of  MasTec's  contracts  require
performance and payment bonds.  Contracts  generally include payment  provisions
under which 5% to 10% is withheld  from payment until the contract work has been
completed.  MasTec typically  agrees to indemnify its customers  against certain
claims and  warrants the quality of its services  for  specified  time  periods,
usually one year.

     MasTec also provides turn-key design, installation and maintenance
services  to  the  wireless  communications  industry,   including  project  and
construction   management,   site  acquisition  and   development,   design  and
construction  of  communications  towers,  placement of antennas and  associated
wiring, construction of equipment huts, and site maintenance.

                                       3
<PAGE>

     Technology  convergence  has led to the  development  of "smart  highways,"
which employ video cameras, remote controlled traffic signals, "talking" message
signs,  road sensors and other  similar  devices  interconnected  by fiber optic
cable to a central  computer that monitors and controls  traffic flow  remotely.
MasTec provides infrastructure  construction services to the traffic control and
highway safety industry,  including the design,  construction and maintenance of
"smart highway" equipment and networks. These services consist of installing and
maintaining traffic signals and their associated  supporting mechanisms (such as
mast-arm  poles,  conduit,  electrical  wiring  and  sensors),   installing  and
maintaining traffic  controllers,  connecting signals and controllers with fiber
optic  cables,  and  erecting  signs on  highways  and  expressways.  The labor,
equipment and expertise  required for traffic control and highway safety systems
construction  are similar to those  required for external  network  services for
telecommunications service providers, such as the installation of fiber optic or
coaxial  cable and  conduit  for  electronically  controlled  signage  and other
traffic  control  systems.  These  services  primarily  are rendered on specific
projects   awarded  on  a  competitive  bid  basis.   Customers   include  state
transportation departments, cities and counties, highway contractors and private
developers,  principally in the Southeast. MasTec conducts this business both as
a prime  contractor and as a  subcontractor.  MasTec  currently has three master
service agreements to provide these services.

External Networks - Power

     MasTec provides  external network  services to power  companies,  including
investor-owned  utilities  and rural  cooperatives.  These  services,  which are
substantially   similar  to  the   external   network   services   provided   to
telecommunications  companies, include overhead and underground construction and
maintenance  of electrical and other  utilities  transmission  and  distribution
networks, substation construction and maintenance,  right-of-way maintenance and
restoration  of asphalt  and  concrete  surfaces.  The work often  involves  the
installation and splicing of high-voltage  transmission and distribution  lines.
Services  to many  of  these  customers  are  provided  under  exclusive  master
contracts with 2 to 3 year initial terms  expiring at various dates,  as well as
on a project by project basis awarded under  competitive  bidding and individual
negotiations.  MasTec  currently  has 42 master  service  agreements  with power
companies.

Internal Network Services

     MasTec provides design,  installation and maintenance of internal  networks
linking  the  customers'   voice,   video,   data  and  internet   computer  and
communications  networks at multiple  locations.  MasTec also  provides  systems
integration services, which involve the selection,  configuration,  installation
and  maintenance  of software,  hardware,  other  computing  and  communications
equipment  and cabling to provide an  integrated  computing  and  communications
system.  Internal  network  services is less  capital  intensive  than  external
network  construction  but requires a more  technically  proficient  work force.
MasTec  provides  these services to its customers  nationwide,  primarily on the
east and west coasts of the United States.

     MasTec provides internal network services to certain customers under master
service  agreements similar to those in the external network business that grant
MasTec the exclusive  right to provide  network  services to the customer within
certain  geographic  regions.  MasTec also provides  inside wiring on individual
projects  that are  awarded on a  competitive  bid basis or  through  individual
negotiation.  MasTec  currently  has two master  service  agreements  to provide
internal network services. MasTec intends to take advantage of the fragmentation
of the internal network  services  industry by marketing a full range of network
services to organizations  with multiple  locations  across the country.  MasTec
believes that these types of customers  increasingly are seeking a single vendor
to provide all of their network services needs.

International Operations and Investments

     MasTec operated in 1998 principally in North America (the United States and
Canada),  the Caribbean and Latin America  ("CALA") and in Spain (CALA and Spain
combined are also referred to as "International"). Combined revenue generated by
International  operations,  as a percentage  of total revenue was 39.8% in 1996,
42.8% in 1997 and 36.2% in 1998. See Note 9 of Notes to  Consolidated  Financial
Statements  for a description  of  operations by geographic  areas and segments.
MasTec provides external network construction outside of North America primarily
in Brazil  through  MasTec  Inepar S/A  Sistemas  de  Telecomunicacoes  ("MasTec
Inepar"),  a  Brazilian  company  owned  51% by  MasTec  and  49% by  Inepar  SA
Industrias e  Construcoes  ("Inepar"),  a leading  telecommunications  and power
infrastructure and equipment company in Brazil.  MasTec Inepar provides external
network services to the local,  long distance and wireless  telephone  companies
formed as a result of the privatization of Telebras, primarily in Sao Paulo, Rio
de Janeiro,  Parana and other states in the more populous and developed southern
region of Brazil.

                                       4
<PAGE>

     In December 1998, MasTec disposed of 87% of its Spanish  operations,  which
included  affiliates in  Argentina,  Chile,  Colombia,  Peru,  Puerto Rico,  and
Venezuela  to a group of  investors.  The  investor  group  included  the  chief
executive  officer  of Sintel  and a member of its  board of  directors.  MasTec
received $0.9 million (130.5 million  pesetas at an exchange rate of 142 pesetas
to the dollar) on the date of closing and  through  March 31, 1999 has  received
$10.2 million.  Payment terms are being re-negotiated not to extend beyond 1999.
The sale  included the  assumption of the  remaining  indebtedness  of MasTec to
Telefonica S.A. for the purchase of the Spanish operations of $25.0 million (3.6
billion  pesetas).  See  Notes  2  and  9 of  Notes  to  Consolidated  Financial
Statements for a description of the Spanish  operations and additional  terms of
the sale.

     MasTec has invested in certain telecommunications  businesses located in or
servicing Latin America. These include minority interests in Supercanal Holding,
S.A.  ("Supercanal")  and related  entities,  which  operate a cable  television
system in Argentina,  and in Consorcio Ecuatoriano de  Telecomunicaciones,  S.A.
("Conecel"),  an Ecuadorian cellular company. MasTec also has an investment in a
company with a license to construct and operate a personal  communication system
("PCS")  in  Paraguay.  MasTec  is  seeking  to  maximize  the  value  of  these
investments and has hired investment bankers to explore strategic alternatives.

Backlog

     At December  31,  1998,  MasTec had a backlog for  domestic  operations  of
approximately  $249.9 million consisting of the uncompleted  portion of services
to be performed  under  project-specific  contracts.  MasTec does not include as
backlog the estimated  amount of work under master services  agreements  because
the customer under these  contracts is not committed to order a specific  volume
of services from MasTec.  MasTec  expects to complete  substantially  all of its
backlog at December 31, 1998 during  calendar  years 1999 through 2002, of which
approximately  88.0% of the domestic  backlog is expected to be completed during
1999.  MasTec also has  international  backlog through its Brazilian  subsidiary
MasTec Inepar of approximately  R$148.2 million  denominated in Brazilian reais,
representing  approximately  $123.4  million in U.S.  dollars as of December 31,
1998,  of which 75% is expected to be completed  during 1999.  Due to the recent
devaluation of the Brazilian currency and the likelihood of further  devaluation
and  deteriorating  economic  conditions in Brazil it is uncertain the amount of
revenue that MasTec will recognize from its international backlog. See Note 1 of
Notes to Consolidated Financial Statements.

Marketing

     MasTec  has  developed  a  company-wide  marketing  plan to  emphasize  the
"MasTec" brand name to its customers.  Marketing efforts are principally carried
out by  management of MasTec's  service  lines.  Executives of MasTec's  service
lines  market to existing and  potential  telecommunications  and other  utility
customers in order to negotiate  new  contracts or be placed on lists of vendors
invited to submit bids for master services agreement and individual construction
projects.  External and internal  network  services  are also  marketed  through
commissioned  salespeople.  These  efforts are  supported by MasTec's  corporate
marketing department.

Suppliers

     MasTec's  customers  supply the majority of the raw  materials and supplies
necessary to carry out MasTec's contracted work, although MasTec is increasingly
supplying materials and supplies on turn-key projects.  MasTec obtains materials
and supplies for its own account from independent third-party providers and does
not  manufacture  any  significant  amount of  materials or supplies for resale.
MasTec is not  dependent on any one supplier for any  materials or supplies that
MasTec obtains for its own account. MasTec has not experienced any difficulty in
obtaining an adequate supply of materials and supplies.

     MasTec  also  uses  independent  contractors  to  perform  portions  of its
services and to manage work flow. These  independent  contractors  typically are
sole  proprietorships  or  small  business  entities.   Independent  contractors
typically provide their own vehicles,  tools and insurance  coverage.  MasTec is
not dependent on any single independent contractor.

                                       5
<PAGE>

Competition

     The industry in which MasTec competes is highly competitive and fragmented.
MasTec  competes  with a  number  of  contractors  in the  markets  in  which it
operates, ranging from small independent firms servicing local markets to larger
firms  servicing   regional  markets,   as  well  as  with  large  national  and
international  engineering  firms and equipment vendors on turn-key projects who
subcontract   construction  work  to  contractors   other  than  MasTec.   These
engineering  firms and equipment  vendors  typically are better  capitalized and
have  greater  resources  than  MasTec.  Most  companies  engaged in the same or
similar  business  tend to  operate  in a  specific,  limited  geographic  area,
although larger  competitors  may bid on a particular  project without regard to
location.  Although  MasTec  believes  it is the  largest  provider  of external
network services for telecommunications service providers and power companies in
the United States and has a significant  presence in Brazil,  neither MasTec nor
any of its competitors can be considered  dominant in the industry on a national
or  international  basis.  MasTec  also  faces  competition  from  the  in-house
construction  and  maintenance  departments  of various  customers and potential
customers, which employ personnel who perform some of the same types of services
as those provided by MasTec.

     Because of the highly  competitive  bidding  environment for infrastructure
services,  the price of the  contractor's  bid  historically  has often been the
principal  factor in  determining  whether the  contractor  is awarded the work.
Smaller  competitors  are sometimes able to win bids based on price alone due to
their lower  overhead  costs.  MasTec  believes  that as demand for its services
increases,  customers  will  increasingly  consider  other factors in choosing a
contractor,   including  technical  expertise  and  experience,   financial  and
operational   resources,    nationwide   presence,   industry   reputation   and
dependability, which should benefit larger, national contractors such as MasTec.

Employees

     As of December 31, 1998,  MasTec (excluding its  unconsolidated  companies)
had approximately 8,250 employees, 7,400 of whom were employed in North American
operations  and  850  of  whom  were  employed  in   International   operations.
Approximately  250 employees are  represented by a labor union,  principally the
Communication Workers of America or the International  Brotherhood of Electrical
Workers. MasTec believes that its employee relations are good.

                      EXECUTIVE OFFICERS OF THE REGISTRANT

     Pursuant to General  Instruction G(3), the information  regarding executive
officers  of  MasTec  called  for by Item  401(b)  of  Regulation  S-K is hereby
included in this Annual Report on Form 10-K.

     The  following  is a list of the  names  and  ages of all of the  executive
officers of MasTec,  indicating  all  positions  and offices with MasTec held by
each such person,  and each such  person's  principal  occupation  or employment
during the past five years.  The executive  officers hold office for one year or
until their successors are elected by the Board of Directors.

    Name                 Age           Position

Jorge Mas                36            Chairman of the Board of Directors,
                                        President and Chief Executive Officer
Joel-Tomas Citron        36            Vice Chairman of the Board of Directors
Carmen M. Sabater        34            Senior Vice President-Finance
Jose Sariego             44            Senior Vice President-General Counsel
Arlene Vargas            32            Vice President and Controller

     Jorge Mas has been  President,  Chief  Executive  Officer and a Director of
MasTec  since March 1994 and was elected  Chairman of the Board of  Directors of
MasTec in January 1998. Prior to March 1994, Mr. Mas served as the President and
Chief  Executive  Officer  of Church & Tower,  Inc.,  MasTec's  predecessor.  In
addition, Mr. Mas is the Chairman of the Board of Directors of Neff Corporation,
a publicly-held  construction  equipment sales and leasing company, and Atlantic
Real Estate Holding Corp., a private real estate holding  company  controlled by
Mr. Mas and,  during all or a portion of the past five years,  has served as the
President and Chief Executive Officer of these corporations.

                                       6
<PAGE>

     Joel-Tomas  Citron  has been a member of the Board of  Directors  of MasTec
since  January 1998 and was elected  Vice  Chairman of the Board of Directors in
November  1998. Mr. Citron was the managing  partner of Triscope  Capital LLC, a
private investment  partnership between January 1998 and December 1998; Chairman
of the Board of Directors of the United  States  subsidiary  of Proventus  AB, a
privately held investment  company based in Stockholm,  Sweden,  and a member of
the Executive  Committee of the group between  January 1992 and December 1997; a
member of the Board of Directors of Neff Corporation since 1998; Chairman of the
Board of American Information Systems, Inc., a provider of intranet and internet
systems solutions between September 1996 and January 1999;  between and a member
of the Board of Directors  of Nesuah  Zannex  Limited,  a  publicly-traded  full
service Israeli securities firm between May 1998 and February 1999.

     Carmen M. Sabater has been MasTec's Corporate Controller since 1994 and was
elected Senior Vice  President-Director  of Finance in December  1998.  Prior to
joining  MasTec,  Ms.  Sabater was a Senior  Manager with  Deloitte & Touche,  a
public accounting firm.

     Jose Sariego has been Senior Vice President-General Counsel of MasTec since
September  1995.  Prior to joining  MasTec,  Mr.  Sariego  was Senior  Corporate
Counsel and Secretary of Telemundo Group,  Inc., a Spanish  language  television
network,  from August 1994 to August 1995. From January 1990 to August 1994, Mr.
Sariego  was a  partner  in  the  Miami  office  of  Kelley  Drye &  Warren,  an
international law firm.

     Arlene  Vargas has been MasTec's  Vice  President and Corporate  Controller
since September 1998.  Prior to joining MasTec,  Ms. Vargas was a Senior Manager
from June 1997 to September  1998 and a Manager from June 1994 to June 1997 with
PricewaterhouseCoopers LLP, a public accounting firm. 

                                   PROPERTIES

     MasTec's  corporate  headquarters  are  located  in a  60,000  square  foot
building owned by MasTec in Miami,  Florida.  MasTec's principal  operations are
conducted from regional and field offices, equipment yards and temporary storage
locations,  none of which MasTec believes is material to its operations  because
most of MasTec's services are performed on the customers'  premises or on public
rights of way. In addition,  MasTec believes that equally  suitable  alternative
locations are available in all areas where it currently does business.

     MasTec also owns a substantial amount of construction  equipment,  which at
December  31,  1998 had a gross book  value of $170.9  million.  This  equipment
includes  trucks,  tractors,  trailers,  bucket  trucks,  backhoes,  bulldozers,
directional  boring  machines,   digger  derricks  and  cranes.  MasTec  obtains
substantially  all of its equipment from various  third-party  vendors,  none of
which MasTec is dependent  upon, and has not  experienced  any  difficulties  in
obtaining desired equipment.

                                LEGAL PROCEEDINGS

     In December 1990,  Albert H. Kahn, a shareholder  of MasTec,  filed a class
action  and  derivative  suit  in  Delaware  state  court  against  MasTec,  the
then-members  of its  Board  of  Directors  and  National  Beverage  Corporation
("NBC"), MasTec's then-largest  shareholder.  The complaint alleges, among other
things,  that  MasTec's  Board of Directors  and NBC breached  their  respective
fiduciary duties in approving certain transactions. The lawsuit seeks to rescind
these transactions and to recover damages in an unspecified amount.

     In November 1993, Mr. Kahn filed a class action and derivative  suit in the
same court against MasTec, the then members of its Board of Directors, and Jorge
L. Mas, Jorge Mas and Juan Carlos Mas, the principal shareholders of MasTec. The
lawsuit  alleges,  among other things,  that MasTec's Board of Directors and NBC
breached  their  respective  fiduciary  duties  by  approving  the  terms of the
acquisition  of MasTec by the Mas family,  and that the Mas family had knowledge
of the  fiduciary  duties  owed by NBC  and  MasTec's  Board  of  Directors  and
knowingly and  substantially  participated  in the breach of these  duties.  The
lawsuit also claims derivatively that each member of MasTec's Board of Directors
engaged in  mismanagement,  waste and  breach of  fiduciary  duties in  managing
MasTec's affairs prior to the acquisition by the Mas family.

     There has been no significant  activity in either of these lawsuits in more
than two years.  MasTec  believes that the allegations in each of these lawsuits
are without merit and intends to defend these lawsuits vigorously.

                                       7
<PAGE>

     In November  1997,  Church & Tower,  Inc.,  a  wholly-owned  subsidiary  of
MasTec,  filed a lawsuit  against  Miami-Dade  County  in  Florida  state  court
alleging  breach of  contract  and seeking  damages  exceeding  $3.0  million in
connection with the county's  refusal to pay amounts due to Church & Tower under
a multi-year agreement to perform road restoration work for the Miami-Dade Water
and Sewer  Department  ("MWSD"),  a department  of the county,  and the county's
wrongful termination of the agreement. The county has refused to pay amounts due
to Church & Tower  under the  agreement  until  alleged  overpayments  under the
agreement  have been  resolved,  and has  counterclaimed  against Church & Tower
seeking  damages.  The county also has  refused to award a new road  restoration
agreement  for MWSD to  Church & Tower,  which  was the low  bidder  for the new
agreement. MasTec is vigorously pursuing this lawsuit.

     MasTec is a party to other pending legal proceedings  arising in the normal
course of business,  none of which MasTec  believes is material to its financial
position or results of operations.

               SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         None.

    MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

     Market  Information.  MasTec's  Common Stock currently is listed on the New
York Stock Exchange under the symbol "MTZ".  The following table sets forth, for
the quarters  indicated,  the high and low sale prices of the Common  Stock,  as
reported by the New York Stock Exchange.

                                     Fiscal Year Ended December 31,
                     -----------------------------------------------------------
                                 1997                           1998
                          High            Low           High             Low
                     ---------------------------   -----------------------------
First Quarter ....   $   46 11/32     $   23       $   34 3/16      $   22 3/8
Second Quarter ...   $   48 5/8       $   25 1/8   $   34           $   19 13/16
Third Quarter ....   $   55 1/4       $   38 1/4   $   26 3/8       $   14 1/2
Fourth Quarter ...   $   45 1/2       $   20 3/8   $   28 3/4       $   12 3/8

     Holders.  As of March 26, 1999, there were 4,679  shareholders of record of
the Common Stock.

     Dividends.  MasTec has not declared cash dividends  since its inception and
does not anticipate  paying any cash dividends in the  foreseeable  future,  but
intends instead to retain any future earnings for  reinvestment in its business.
On January 15, 1997,  MasTec announced a three-for-two  split of its outstanding
shares of Common  Stock.  The stock  split was  effected  in the form of a stock
dividend and entitled each  shareholder of record on February 3, 1997 to receive
an additional share of Common Stock for every two shares of Common Stock held by
such  shareholder  of record on the  record  date.  The stock  split was paid on
February 28, 1997.  MasTec paid cash in lieu of fractional shares resulting from
the stock  split  based on the last sale price as reported on the New York Stock
Exchange on the record date.  All  references in this Annual Report to shares of
Common Stock have been adjusted to give effect to the stock split.

     Any future determination as to the payment of dividends will be made at the
discretion  of the  Board  of  Directors  of  MasTec  and will  depend  upon its
operating results, financial condition,  capital requirements,  general business
conditions and such other factors as the Board of Directors  deem  relevant.  In
addition,  certain  credit  agreements to which MasTec is a party  prohibit from
paying  dividends or making other  distributions on the Common Stock without the
prior  written  consent  of  the  lenders  under  such  credit  agreements.  See
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations--Liquidity and Capital Resources."

                                       8
<PAGE>

                             SELECTED FINANCIAL DATA

     The  following  statement of  operations  and balance  sheet data have been
derived from MasTec's audited  financial  statements  including the consolidated
balance  sheets  at  December  31,  1998 and 1997 and the  related  consolidated
statements of operations,  of changes in shareholders'  equity and of cash flows
for each of the years in the  three-year  period ended December 31, 1998 and the
notes thereto, appearing elsewhere in this Annual Report. The following selected
financial data should be read in conjunction  with such  consolidated  financial
statements  and the  notes  thereto,  as well as  "Management's  Discussion  and
Analysis of Financial Condition and Results of Operations."
<TABLE>
<CAPTION>
                                                                          Year Ended December 31,
                                                       ----------------------------------------------------------
                                                        1994(1)      1995       1996(2)     1997(3)       1998(4)
                                                       ----------------------------------------------------------
<S>                                                    <C>         <C>         <C>         <C>         <C>           
                                                                   (In thousands, except per share data)
    Statement of Income Data:
    Revenue ......................................     $111,294    $174,583    $472,800    $659,439    $1,048,922
    Costs of revenue .............................       83,952     130,762     352,329     496,230       803,112
    Depreciation and amortization ................        4,439       6,913      12,000      23,465        43,313
    Compensation charge ..........................         --          --          --          --          33,765
    General and administrative expenses ..........       13,022      19,081      58,529      82,261       140,472
    -------------------------------------------------------------------------------------------------------------
    Operating income .............................        9,881      17,827      49,942      57,483        28,260
    Interest expense .............................        3,587       4,954      11,434      11,541        29,580
    Interest income ..............................        1,469       3,349       3,246       1,783         9,093
    Real estate and investment write-downs (5) ...         --        23,086        --          --            --
    Other income (expense), net (6) ..............        2,386       4,424         769       8,332        (5,155)
    -------------------------------------------------------------------------------------------------------------
    Income (loss) before provision (benefit) for
      income taxes, equity in earnings (losses) of
      unconsolidated companies and minority interest     10,149      (2,440)     42,523      56,057         2,618

    Provision (benefit) for income taxes (7) .....        2,877      (1,970)     15,591      20,944        12,550
    Equity in earnings (losses) of unconsolidated
      companies and minority interest (8) ..........        247        (139)      3,133        (449)       (3,983)
    =============================================================================================================
    Net income (loss) ............................     $  7,519    $   (609)   $ 30,065    $ 34,664    $  (13,915)
    =============================================================================================================

    Weighted average common shares outstanding (9)       24,116      23,892      24,703      26,460        27,489

    Basic earnings (loss) per share ..............     $   0.31    $  (0.03)   $   1.22    $   1.31    $    (0.51)

    Weighted average common shares outstanding (9)       24,116      23,892      25,128      27,019        27,489

    Diluted earnings (loss) per share ............     $   0.31    $  (0.03)   $   1.20    $   1.28    $    (0.51)


                                                             As of December 31,
                                                       ----------------------------------------------------------
                                                         1994        1995        1996        1997        1998(10)
                                                       ----------------------------------------------------------
                                                                            (In thousands)
    Balance Sheet Data:
    Property and equipment, net ..................     $ 40,102    $ 44,571    $ 59,602    $ 86,109    $  142,897
    Total assets .................................      142,452     170,163     483,018     630,224       735,486
    Total debt ...................................       44,185      72,089     155,192     149,057       321,832
    Total shareholders' equity ...................       50,874      50,504     103,504     223,697       204,273
</TABLE>

     (1)  Includes the results of  operations  of Burnup & Sims Inc.  from March
          11, 1994.    
     (2)  Includes  the results of  operations  of MasTec's  Spanish  subsidiary
          Sintel from May 1, 1996.
     (3)  Includes the results of  operations of MasTec's  Brazilian  subsidiary
          MasTec Inepar from July 31, 1997.

                                       9
<PAGE>

     (4)  Includes  the results of  operations  of MasTec's  Spanish  subsidiary
          Sintel through December 31, 1998, which includes  severance charges of
          $13.4 million,  of which $1.9 million is reflected in costs of revenue
          and $11.5 million in general and administrative expenses.
     (5)  As a result of the disposal of non-core  real estate  assets and other
          investments,  MasTec  recorded  $23.1  million  in charges in the year
          ended December 31, 1995.
     (6)  Included in 1997 results of  operations is a gain of $7.1 million from
          the partial sale of MasTec's  interest in Conecel and in 1998 includes
          a loss  of $9.2  million  related  to the  sale  of  MasTec's  Spanish
          subsidiary.
     (7)  MasTec's  effective tax rate for the year ended  December 31, 1998 was
          mainly  affected by a tax  liability  of  approximately  $7.8  million
          resulting  from the sale of 87% of MasTec's  Spanish  subsidiary,  the
          non-deductibility  of the amortization of certain  intangibles and the
          non-deductibility of other expenses.
     (8)  Included  in 1997 and  1998  results  of  operations  is the  minority
          interest related to MasTec's Brazilian subsidiary MasTec Inepar.
     (9)  Amounts have been  adjusted to reflect the  three-for-two  stock split
          effected on February 28, 1997.
     (10) As of December  31, 1998,  MasTec sold 87% of its Spanish  subsidiary,
          therefore,  the balance  sheet data as of  December  31, 1998 does not
          include the financial position of these operations.


                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Results of Operations

     Revenue is generated primarily from external and internal network services.
See Notes 1 and 9 of Notes to Consolidated  Financial  Statements.  Services are
provided to telephone companies,  public utilities,  cable television operators,
other   telecommunications   providers,   governmental   agencies   and  private
businesses.  Costs of revenue include  operations payroll and employee benefits,
subcontractor costs and expenses,  materials not supplied by the customer, fuel,
equipment  rental and insurance.  General and  administrative  expenses  include
management  salaries  and  benefits,  rent,  travel,  telephone  and  utilities,
professional fees and clerical and administrative overhead.

     The  following  tables  sets forth for each of 1996,  1997 and 1998  income
statement  data and its  related  percentage  of revenue by  geographic  region.
During 1998, MasTec recharacterized as purchases two acquisitions consummated in
1997, which were originally accounted for as pooling of interests. See Note 1 of
Notes to Consolidated Financial Statements.

North America
<TABLE>
<CAPTION>
                                                       Year Ended December 31,
                                         ------------------------------------------------------
                                               1996              1997               1998(1)
                                         ----------------   ----------------   ----------------
<S>                                      <C>       <C>      <C>       <C>      <C>       <C>
    Revenue ...........................  $284,645  100.0%   $377,046  100.0%   $669,628  100.0%
    Costs of revenue ..................   216,940   76.2%    279,394   74.1%    506,721   75.7%
    Depreciation and amortization .....     9,942    3.5%     20,452    5.4%     37,284    5.6%
    General and administrative expenses    27,554    9.7%     41,167   10.9%    112,530   16.8%
                                         ========  ======   ========  ======   ========  ======
         Operating income .............  $ 30,209   10.6%   $ 36,033    9.6%   $ 13,093    1.9%
                                         ========  ======   ========  ======   ========  ======
</TABLE>

     (1)  General and  administrative  expenses  includes a $33.8 million charge
          for compensation and severance charges.

      Year Ended December 31, 1998 Operating Income Compared to Year Ended
                       December 31, 1997 Operating Income

     MasTec's  North  American  revenue  was $669.6  million  for the year ended
December 31, 1998, compared to $377.0 million in 1997,  representing an increase
of $292.6  million or 77.6%.  The  increase  in North  American  revenue was due
primarily to revenue  generated from acquired  companies,  as well as internally
generated  growth.  During 1998,  MasTec  acquired 12 companies in North America
which generated revenue of approximately  $255.1 million,  representing 87.2% of
the  total  increase  in  revenue.   MasTec's  North  American  operations  have
experienced an internal  compounded  annual growth rate of  approximately  21.4%
since 1995.  For the year ended  December 31, 1998,  the  percentage of MasTec's
North   American   revenue   generated   by  external   network   services   for

                                       10
<PAGE>

telecommunication  services  providers  was 68.1%  (74.6% in 1997),  by external
network  services for power  companies  was 18.0% (5.2% in 1997) and by internal
network services was 13.4% (12.5% in 1997).

     MasTec's  North  American  costs of revenue were $506.7 million or 75.7% of
revenue for the year ended  December  31,  1998,  compared to $279.4  million or
74.1% of revenue in 1997,  representing  an increase of $227.3 million or 81.4%.
The increase in costs of revenue as a percentage of revenue was due primarily to
numerous  inefficiencies  caused by severe weather conditions in various regions
as a result of the climactic  condition known as "El Nino",  poor performance in
three divisions and losses from a non-core contract.

     Depreciation and amortization  expense was $37.3 million or 5.6% of revenue
for the year ended  December  31,  1998,  compared  to $20.5  million or 5.4% of
revenue in 1997.

     General and administrative expenses were $112.5 million or 16.8% of revenue
for the year ended  December  31,  1998,  compared to $41.2  million or 10.9% of
revenue in 1997,  representing  an  increase  of $71.4  million  or 173.4%.  The
increase in general and  administrative  expenses  was due  primarily to a $33.8
million   compensation   charge  for  senior  management  at  certain  operating
subsidiaries,  $1.4  million  for  start-up  costs and  charges of $4.5  million
related to bad debts.  Excluding the previously mentioned expenses,  general and
administrative expenses were $72.9 million or 10.9% of revenue in 1998.

      Year Ended December 31, 1997 Operating Income Compared to Year Ended
                       December 31, 1996 Operating Income

     Revenue from North America operations was $377.0 million for the year ended
December 31, 1997, compared to $284.6 million in 1996,  representing an increase
of $92.4  million or 32.5%.  The  increase  in North  American  revenue  was due
primarily to revenue  generated  from  acquired  companies,  as well as internal
growth.  MasTec's North American  operations  experienced an internal compounded
annual  growth  rate of  approximately  19.3%  since  1995.  For the year  ended
December 31, 1997, the percentage of MasTec's North American  revenue  generated
by external network services for  telecommunication  service providers was 74.6%
(77.1% in 1996) external  network services for electric power companies was 5.2%
(1.3% in 1996) and  12.5%  (12.5% in 1996) was  generated  by  internal  network
services.

     MasTec's  North  American  costs of revenue were $279.4 million or 74.1% of
revenue for the year ended  December  31,  1997,  compared to $216.9  million or
76.2% of revenue in 1996,  representing  an increase of $62.5  million or 28.8%.
The increase in North  American  costs of revenue was due  primarily to costs of
revenue  generated from acquired  companies as well as cost of revenue generated
by internal growth.  The decrease in costs of revenue as a percentage of revenue
was due primarily to improved margins generated during 1997 in certain projects,
as well as improved costs of revenue management.

     Depreciation and amortization  expense was $20.5 million or 5.4% of revenue
for the year  ended  December  31,  1997,  compared  to $9.9  million or 3.5% of
revenue in 1996,  representing  an  increase  of $10.5  million  or 105.7%.  The
increase in  depreciation  and  amortization  was a result of increased  capital
expenditures  ($19.7 million in 1997 compared to $7.1 million in 1996),  as well
as amortization of intangibles resulting from acquisitions.

     General and administrative expenses were $41.2 million or 10.9% of revenues
for the year ended  December  31,  1997,  compared  to $27.6  million or 9.7% of
revenue in 1996.  The  increase in general and  administrative  expenses was due
primarily  to  general  and  administrative  expenses  generated  from  acquired
companies.  The increase of general and administrative  expenses as a percentage
of revenue was due primarily to a $4.6 million reserve recorded by MasTec.

                                       11
<PAGE>

CALA
                                                Year Ended December 31,
                                         -----------------------------------
                                             1997 (1)           1998
                                         ----------------   ----------------
    Revenue ...........................  $ 74,900  100.0%   $141,954  100.0%
    Costs of revenue ..................    63,266   84.5%    112,667   79.4%
    Depreciation and amortization .....       390    0.4%      3,349    2.4%
    General and administrative expenses     1,615    2.2%     10,636    7.4%
                                         --------  ------   --------  ------
         Operating income .............  $  9,629   12.9%   $ 15,302   10.8%
                                         ========  ======   ========  ======

     (1)  CALA operations began on August 1, 1997

      Year Ended December 31, 1998 Operating Income Compared to Five Months
                    Ended December 31, 1997 Operating Income

     MasTec's  CALA revenue was $142.0  million for the year ended  December 31,
1998,  compared  to $74.9  million in 1997,  representing  an  increase of $67.1
million or 89.5%.  The  increase in revenue was due  primarily to a full year of
operations in 1998, compared to five months in 1997.

     MasTec's  CALA  costs of revenue  were  $112.7  million  for the year ended
December 31, 1998,  compared to $63.3 million in 1997,  representing an increase
of $49.4  million  or 78.0%.  Costs of  revenue  were  79.4% of revenue in 1998,
compared to 84.5% in 1997.  The decrease in costs of revenue as a percentage  of
revenue was due primarily to the completion of certain wireless  projects in the
fourth  quarter of 1998.  MasTec does not  anticipate  CALA margins to remain at
this level in the future.

     Depreciation and  amortization  expense was $3.3 million for the year ended
December  31,  1998.  Depreciation  and  amortization  relates  primarily  to an
intangible asset resulting from one acquisition  which is being amortized over a
five year period.  Depreciation and amortization expense was 2.4% of revenue for
the year ended December 31, 1998.

     General and  administrative  expenses were $10.6 million or 7.4% of revenue
for the year ended December 31, 1998,  compared to $1.6 million or 2.2% in 1997,
representing an increase of $9.0 million or 558.6%.  The increase in general and
administrative   expenses  was  due  primarily  to  costs  of   establishing  an
infrastructure   to  support   anticipated   additional   work   following   the
privatization  of  Telebras,  which did not take place  until July 1998.  Due to
recent  economic  conditions  in Brazil,  it is uncertain  when, if at all, such
additional work will materialize.

Spain
<TABLE>
<CAPTION>
                                                         Year Ended December 31,
                                         ------------------------------------------------------
                                              1996 (1)            1997              1998 (2)
                                         ----------------   ----------------   ----------------
<S>                                      <C>       <C>      <C>       <C>      <C>       <C>
    Revenue ...........................  $188,155  100.0%   $207,493  100.0%   $237,340  100.0%
    Costs of revenue ..................   135,389   71.9%    153,180   73.8%    183,724   77.4%
    Depreciation and amortization .....     2,058    1.1%      3,013    1.5%      2,680    1.1%
    General and administrative expenses    30,975   16.5%     39,478   19.0%     51,070   21.5%
                                         --------  ------   --------  ------   --------  -=----
         Operating income .............  $ 19,733   10.5%   $ 11,822    5.7%   $   (134)   0.0%
                                         ========  ======   ========  ======   ========  ======
</TABLE>

     (1)  Spanish  operations  began on April 30, 1996, the date of acquisition.
     (2)  Includes a total of $13.4  million of severance  charges of which $1.9
          million is reflected in costs of revenue and $11.5  million in general
          and administrative expenses.

                                       12
<PAGE>

      Year Ended December 31, 1998 Operating Income Compared to Year Ended
                       December 31, 1997 Operating Income

     Revenue  from  Spanish  operations  was $237.3  million  for the year ended
December 31, 1998, compared to $207.5 million in 1997,  representing an increase
of $29.8 million or 14.4%. The increase was due to acquisitions made in 1998.

     Costs of revenue were $183.7 million or 77.4% of revenue for the year ended
December  31,  1998,  compared  to $153.2  million  or 73.8% of revenue in 1997,
representing  an increase of $30.5  million or 19.9%.  The  increase in costs of
revenue as a percentage  of revenue was due  primarily to increased  labor costs
associated  with a new labor  agreement  and to $1.9  million  in  direct  labor
severance costs.

     Depreciation and  amortization  expense was $2.7 million for the year ended
December  31,  1998,  compared  to  $3.0  million  in  1997.   Depreciation  and
amortization  expense was 1.1% of revenue for the year ended  December 31, 1998,
compared to 1.5% of revenue in 1997.

     General and administrative  expenses were $51.1 million or 21.5% of revenue
for the year ended  December  31,  1998,  compared to $39.5  million or 19.0% of
revenue  in 1997,  representing  an  increase  of $11.6  million  or 29.4%.  The
increase in general and  administrative  expenses as a percentage of revenue was
due  to  severance  charges  of  $11.5  million  resulting  from  reductions  in
administrative personnel.

     Year Ended December 31, 1997 Operating Income Compared to Eight Months
                    Ended December 31, 1996 Operating Income

     Revenue  generated by Spanish  operations  was $207.5  million for the year
ended  December 31, 1997,  compared to $188.2 million in 1996,  representing  an
increase of $19.3 million or 10.3%. The increase in revenue was due primarily to
a full  year of  operations  in 1997,  compared  to eight  months  in the  1996.
MasTec's  Spanish   operations  were  negatively   impacted  during  1997  by  a
devaluation of approximately  18% in the Spanish peseta and by work stoppages in
the second half of 1997.

     Costs of revenue were $153.2 million or 73.8% of revenue for the year ended
December  31,  1997,  compared  to $135.4  million  or 71.9% of revenue in 1996,
representing  an increase of $17.8  million or 13.1%.  The  increase in costs of
revenue as a  percentage  of revenue  was due  primarily  to lower  productivity
during 1997 as a result of the work stoppages.

     General and administrative  expenses were $39.5 million or 19.0% of revenue
for the year ended  December  31,  1997,  compared to $31.0  million or 16.5% of
revenue in 1996, representing an increase of $8.5 million or 27.5%. The increase
in general and  administrative  expenses was due to a full year of operations in
1997,   compared  to  eight  months  in  1996.   The  increase  in  general  and
administrative  expenses as a percentage  of revenue was due mainly to increased
salaries and compensation expense resulting from increases in base salary.

                                       13
<PAGE>

Consolidated Results

     The  following  table  sets forth for each of 1996,  1997 and 1998  certain
consolidated  income  statement data and its related  percentage of consolidated
revenue.
<TABLE>
<CAPTION>
                                                                         Year Ended December 31,
                                                      --------------------------------------------------------
                                                            1996                1997                1998
                                                      ----------------    ----------------   -----------------
    <S>                                               <C>       <C>       <C>       <C>       <C>       <C>
    Operating income .............................    $ 49,942   10.6%    $ 57,483    8.7%    $ 28,260    2.7%
    Interest expense .............................      11,434    2.4%      11,541    1.8%      29,580    2.8%
    Interest income ..............................       3,246    0.7%       1,783    0.3%       9,093    0.9%
    Other income (expense), net ..................         769    0.1%       8,332    1.3%      (5,155)   0.5%
                                                      --------  ------    --------  ------    --------  ------
    Income before provision for income taxes, 
       equity in earnings (losses) of
       unconsolidated companies and minority 
       interest ..................................      42,523    9.0%      56,057    8.5%       2,618    0.3%
    Provision for income taxes ...................      15,591    3.3%      20,944    3.2%      12,550    1.2%
    Equity in earnings (losses) of  unconsolidated
       companies and minority interest ...........       3,133    0.7%        (449)  (0.0)%     (3,983)   0.4%
                                                      --------  ------    --------  ------    --------  ------
         Net income (loss) .......................    $ 30,065    6.4%    $ 34,664    5.3%    $(13,915)  (1.3)%
                                                      ========  ======    ========  ======    ========  ======
    </TABLE>

      Year Ended December 31, 1998 Compared to Year Ended December 31, 1997

     For  a  discussion  of  revenue,   costs  of  revenue,   depreciation   and
amortization  and  general and  administrative  expenses,  see "North  America,"
"CALA" and "Spain" above.

     Interest  expense was $29.6  million for the year ended  December 31, 1998,
compared to $11.5 million in 1997,  representing an increase of $18.0 million or
156.3%.  The  increase  in  interest  expense  was due  primarily  to  increased
indebtedness  resulting from the issuance of the Senior Notes in early 1998, the
proceeds of which were used primarily for acquisitions and to fund international
operations   investments.   See  Note  5  of  Notes  to  Consolidated  Financial
Statements.

     Included in other  expense for 1998 is a $9.2  million  loss on sale of the
Spanish  operation.  The effective income tax rate, on a consolidated  basis for
the year ended  December  31, 1998  increased  to 479%,  from 37% in 1997.  This
increase  was mainly  attributable  to the  recognition  of  approximately  $9.2
million  of a loss on sale  of  MasTec's  Spanish  operations,  however  for tax
purposes the Company  recorded a tax  provision of $7.8  million.  Excluding the
effect of the book loss on sale and the taxable  gain,  the  effective  tax rate
would have been  42.2%,  which is  attributed  to the  non-deductibility  of the
amortization  of  intangibles  and  other  expenses.  See  Note  7 of  Notes  to
Consolidated Financial Statements.

      Year Ended December 31, 1997 Compared to Year Ended December 31, 1996

     Interest  expense  was $11.5  million or 1.8% of revenue for the year ended
December  31,  1997,  compared  to $11.4  million  or 2.4% of  revenue  in 1996,
representing  an increase of $107,000 or 0.9%. The decrease in interest  expense
as a  percentage  of revenue  was due to  increased  revenue  while the  average
balance on debt remained basically unchanged.

     Included  in  other  income  for  1997  is a $7.1  million  gain on sale of
MasTec's  indirect  interest  in Conecel.  See Note 11 of Notes to  Consolidated
Financial Statements.

Liquidity and Capital Resources

     MasTec's  primary  liquidity  needs are for  working  capital,  to  finance
acquisitions, for capital expenditures and to service its indebtedness. MasTec's
primary  sources of liquidity are cash flow from  operations,  borrowings  under
revolving  lines of credit and the  proceeds  from the sale of  investments  and
other assets held for sale.

                                       14
<PAGE>

     Net cash used in operating  activities was $13.9 million for the year ended
December 31, 1998,  compared to cash  provided by operating  activities of $15.2
million in 1997. Net cash used by operating  activities of $13.9 million was due
primarily to a net loss for the year ended December 31, 1998.

     As of December 31, 1998, working capital was $244.5 million ($180.4 million
domestic and $64.1 million international)  compared to working capital of $124.1
million ($76.8 million domestic and $47.3 million international) at December 31,
1997. As of December 31, 1998, working capital included $50.9 million related to
financing  and  $46.4  million  of assets  held for sale  included  in  domestic
operations  and $27.3 million of receivables  from the sale of MasTec's  Spanish
operations  included  in  international  operations.  Working  capital  in 1998,
excluding previously described items, was $83.1 million for domestic compared to
$76.8 million in 1997. For international,  working capital increased,  excluding
Spanish operations,  from $22.8 million in 1997 to $36.8 million at December 31,
1998.

     MasTec invested cash (net of cash acquired of $5.0 million in 1998 and $3.3
million in 1997) in  acquisitions  and investments in  unconsolidated  companies
totaling  $89.1 million  during 1998  compared to $49.0 million in 1997.  During
1998, MasTec made capital expenditures of $76.4 million, primarily for machinery
and equipment  used in the  production of revenue,  compared to $21.5 million in
1997. The increase in capital  expenditures was due mainly to fleet upgrades for
acquired  companies and internal  growth.  Of the total  invested funds in 1998,
$64.5 million was related to North American  acquisitions  and $71.4 million was
related to North American capital expenditures.

     MasTec entered into agreements with certain senior management  personnel at
two of its operating  subsidiaries.  These senior  managers agreed to multi-year
employment   agreements  and  10-year   non-competition   and   non-solicitation
agreements.  Under the agreements,  MasTec paid the senior managers compensation
in the  form  of cash  and  common  stock  options.  The  cash  portion  totaled
approximately  $33.3 million,  of which  approximately $13.3 million was paid in
1998 and approximately $20.0 million was paid in the first quarter of 1999. As a
result of these agreements,  MasTec recorded a non-recurring compensation charge
of approximately  $33.8 million (including the value of vested stock options) in
the fourth quarter of 1998.

     During 1998,  MasTec  provided a customer  financing in connection with the
sale of construction services. As of December 31, 1998, MasTec had $41.8 million
outstanding  under this agreement.  MasTec  anticipates  that it will provide an
additional $8.0 million of financing under this agreement. MasTec will terminate
financing agreement as of April 30, 1999.

     Although  the PCS system is held for sale,  MasTec is committed to continue
developing the system in Paraguay.  MasTec anticipates  investing  approximately
$13.0  million  for the  development  of this  system  over the next 12  months.
Commercial operation of the system must be initiated no later than May 10, 1999,
unless extended. MasTec is seeking an extension of this date.

     During 1998,  MasTec sold 87% of its Spanish  operations  for $27.3 million
which is  recorded  in other  current  assets in the  accompanying  consolidated
balance  sheet as of December 31, 1998.  The proceeds from the sale will be used
for general corporate purposes including reducing indebtedness.

     MasTec announced a stock repurchase program in April 1998. Through December
1998,  MasTec had  purchased  a total of 667,000  shares at an average  price of
$20.58.

     In December 1998, MasTec increased its existing credit facility from $125.0
million to $165.0  million  (the "Credit  Facility"),  with a group of financial
institutions  led by  BankBoston,  N.A.  Amounts  outstanding  under the  Credit
Facility  mature on June 9,  2000.  Upon  written  request  by MasTec and at the
bank's sole discretion, the maturity date of the Credit Facility may be extended
for  successive  annual  periods  up to a final  maturity  date of June 9, 2002.
MasTec is required to pay an unused  facility  fee ranging from .25% to .50% per
annum on the facility, depending upon certain financial covenants.

     The Credit Facility is secured by a pledge of shares of certain of MasTec's
subsidiaries.  Interest  under the Credit  Facility  accrues at rates based,  at
MasTec's  option,  on the  agent  bank's  Base  Rate plus a margin of up to .50%
depending on certain financial covenants or 1% above the overnight federal funds
effective rate, whichever is higher, or its LIBOR Rate (as defined in the Credit
Facility)  plus a margin  of 1.00% to  2.25%,  depending  on  certain  financial
covenants.

     MasTec had  outstanding  $18.7  million in standby  letters of credit as of
December 31, 1998.

                                       15
<PAGE>

     In January 1998,  MasTec issued $200.0  million  principal  amount of 7.75%
senior  subordinated  notes (the  "Senior  Notes")  due 2008 with  interest  due
semi-annually.  The net proceeds were used  primarily for  acquisitions  and for
other corporate purposes.

     The  Credit  Facility  and the Senior  Notes  contain  customary  events of
default and  covenants  which  prohibit,  among  other  things,  making  certain
investments in excess of a specified amount,  incurring additional  indebtedness
in excess of a  specified  amount,  paying  dividends  in excess of a  specified
amount,  making capital  expenditures in excess of a specified amount,  creating
liens, prepaying other indebtedness, including the Senior Notes, and engaging in
certain  mergers  or  combinations  without  the prior  written  consent  of the
lenders.  The Credit  Facility also  provides that MasTec must maintain  certain
financial ratio coverages,  requiring,  among other things minimum ratios at the
end of each fiscal quarter of debt to earnings and earnings to interest expense.
See Note 5 of Notes to Consolidated Financial Statements.

     MasTec  expects to finance  its  current  working  capital  needs,  capital
expenditures, debt service obligations and other commitments from cash generated
from  operations,  borrowings under its existing Credit Facility and the sale of
investments and other assets. Subsequent to December 31, 1998, MasTec has signed
letters of intent to acquire  two  external  network  and one  internal  network
services contractors, subject to a number of conditions. MasTec anticipates that
available cash, cash flows from operations and borrowing  availability under the
Credit  Facility will be sufficient  to satisfy  MasTec's  liquidity and working
capital  requirements for the foreseeable  future;  however,  to the extent that
MasTec should desire to increase its financial flexibility and capital resources
or require or choose to fund future capital  commitments from sources other than
operating cash or from borrowings under its existing Credit Facility, MasTec may
consider raising additional capital by increasing its Credit Facility or through
the offering of equity and/or debt securities in the public or private  markets.
There can be no assurance, however, that additional capital will be available to
MasTec on acceptable terms, or at all.

     MasTec owns interest in a number of foreign operations,  primarily in Latin
America,  which  are  subject  to  greater  political,  monetary,  economic  and
regulatory risks than its domestic operations. During January 1999 the Brazilian
government  allowed  its  currency  to trade  freely  against  other  currencies
resulting in an immediate  devaluation of the Brazilian reais. The impact on the
devaluation  on an operation  depends on the  devaluation's  effect on the local
economy and the ability of an operation to raise prices and/or reduce  expenses.
Additionally,  the  economies  of  other  countries  in Latin  America  could be
adversely  impacted by Brazil's economic and monetary  problems.  The likelihood
and extent of further  devaluation  and  deteriorating  economic  conditions  in
Brazil and other Latin America  countries and the resulting  impacts on MasTec's
results  of  operations,  financial  position  and  cash  flows  cannot  now  be
determined.  MasTec  monitors its currency  exchange risk but currently does not
hedge  against  this risk.  There can be no  assurance  that  currency  exchange
fluctuations  or other  economic  problems  will not adversely  affect  MasTec's
results of operations, financial position and cash flows.

Year 2000

     The Year 2000 issue is the  result of  computer  programs  using two digits
rather  than  four to define  the  applicable  year.  Any of  MasTec's  computer
programs  that have  time-sensitive  software may recognize a date using "00" as
the year 1900 rather than the year 2000.  This could result in a system failure,
disruption of operations and/or a temporary inability to conduct normal business
activities.

     MasTec has  undertaken a Year 2000 project which  includes an assessment of
telecommunications  equipment,  computer  equipment,  software,  database,  data
services,  network infrastructure,  and telephone equipment.  MasTec's Year 2000
plan addresses the Year 2000 issue in four phases: (1) inventory and assessment;
(2) impact analysis and implementation planning; (3) implementation and testing;
and (4) on-going and monitoring.  As each phase is completed,  project  progress
will be tracked  against  planned  targets,  and  resource  adjustments  made as
necessary. At this time, a majority of MasTec's information systems and embedded
devices have been inventoried and assessed, and MasTec has begun impact analysis
and implementation  planning,  as well as some  implementation and testing.  The
project is estimated to be complete by the end of 1999, prior to any anticipated
impact on MasTec's  operating  systems.  MasTec  believes  that with upgrades to
existing  software,  conversions  to new  software  and  replacement  of certain
products  and  equipments,  the  Year  2000  issue  will  not  pose  significant

                                       16
<PAGE>

operational problems.  Based on its current assessment efforts,  MasTec does not
believe  that  Year  2000  issues  will have a  material  adverse  effect on its
financial condition or results of operations.  If, however,  necessary upgrades,
replacements  and  conversions  are not  made or are not  completed  on a timely
basis,  the Year  2000  issue may have a  material  adverse  effect on  MasTec's
business,  financial  condition  and results of  operations.  MasTec's Year 2000
issues  and any  potential  business  interruptions,  costs,  damages  or losses
related  thereto,  are  dependent,  to a  certain  degree,  upon the  Year  2000
readiness of third  parties such as vendors and  suppliers.  As part of MasTec's
Year  2000  efforts,   formal   communications  with  all  significant  vendors,
suppliers,  banks and clients are being pursued to determine the extent to which
related  interfaces with MasTec's  systems are vulnerable if these third parties
fail to remediate their Year 2000 issues. There cannot be any assurance that any
such third parties will address any Year 2000 issues that they have or that such
third parties' systems will not materially adversely affect MasTec's systems and
operations.

     MasTec  continues  to assess the Year 2000 issue with  respect to  internal
business systems, and has initiated the implementation of corrective measures to
address the issue.  MasTec is evaluating  the need for  contingency  planning at
this time of its system and embedded  devices.  The  assessment of third parties
external to MasTec is underway, and may reveal the need for contingency planning
based on the progress and findings of the Year 2000 project.

     MasTec will  utilize both  internal and external  resources to complete and
test the Year 2000 project.  At the present time,  MasTec is estimating the cost
of this project.  Through  December 31, 1998,  related  costs  incurred were not
material,  and  MasTec  does not  expect  that the  total  cost of its Year 2000
project  will be material to its  financial  position or results of  operations.
Project  costs and the targeted  completion  date will be based on  management's
best  estimates,  which will be derived from utilizing  numerous  assumptions of
future events,  including the continued  availability of certain resources,  the
ability  to  locate  and  correct  all  relevant  computer  codes,  third  party
modification plans and other factors.  There can be no assurance these estimates
will be  achieved or that the actual  results  will not differ  materially  from
those anticipated.

Seasonality

     MasTec's North America  operations have historically been seasonally weaker
in the first and fourth quarters of the year and have produced  stronger results
in the second and third  quarters.  This  seasonality is primarily the result of
customer budgetary  constraints and preferences and the effect of winter weather
on external network activities. Certain U.S. customers, particularly the ILEC's,
tend to complete  budgeted capital  expenditures  before the end of the year and
defer  additional  expenditures  until the following  budget year.  Revenue in a
local currency from MasTec Inepar is not expected to fluctuate seasonally.

Impact of Inflation

     The primary  inflationary factor affecting MasTec's operations is increased
labor costs. MasTec has not experienced  significant increases in labor costs to
date.  Competition for qualified personnel could increase labor costs for MasTec
in the future.  MasTec's  international  operations may, at times in the future,
expose it to high inflation in certain foreign  countries.  During 1998,  MasTec
generated  approximately 17.5% of its total revenue (excluding revenue generated
from  MasTec's  Spanish  operations  which  were  sold in  December  1998)  from
international   operations  that  are   susceptible  to  currency   devaluation.
Management anticipates that revenue from MasTec's international  operations will
be less significant to MasTec's  operations in the foreseeable future due to its
current  intentions to dispose of them,  however,  the  likelihood and extent of
further  devaluation and deteriorating  economic  conditions in Brazil and other
Latin  America  countries  and the  resulting  impacts  on  MasTec's  results of
operations, financial position and cash flows cannot now be determined.


           QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     See Notes 1 and 5 of Notes to  Consolidated  to  Financial  Statements  for
disclosures about market risk.

                                       17
<PAGE>



                   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA



                                                                           Page

Reports of Independent Accountants........................................   19

Consolidated Statements of Operations for the Years Ended 
  December 31, 1996, 1997, and 1998.......................................   21

Consolidated Balance Sheets as of December 31, 1997 and 1998..............   22

Consolidated Statement of Changes in Shareholders' Equity for 
     the Years Ended December 31, 1995, 1996, 1997 and 1998...............   23

Consolidated Statements of Cash Flows for the Years Ended 
     December 31, 1996, 1997, and 1998....................................   24

Notes to Consolidated Financial Statements................................   27




                                       18
<PAGE>



                        REPORT OF INDEPENDENT ACCOUNTANTS



To the Board of Directors and
  Shareholders of MasTec, Inc.:


 
     In our opinion, based upon our audits and the report of other auditors, the
accompanying consolidated balance sheets and the related consolidated statements
of operations, changes in shareholders' equity and cash flows present fairly, in
all  material  respects,   the  financial  position  of  MasTec,  Inc.  and  its
subsidiaries  ("MasTec") at December 31, 1997 and 1998, and the results of their
operations  and their cash flows for each of the three years in the period ended
December 31, 1998 in conformity with generally accepted  accounting  principles.
These  consolidated  financial  statements  are the  responsibility  of MasTec's
management;  our  responsibility is to express an opinion on these  consolidated
financial  statements  based on our  audits.  We did not audit the  consolidated
financial statements of Sintel,  S.A., a wholly-owned  subsidiary until December
31, 1998 which statements reflect total assets of $195.2 million at December 31,
1997 and total revenues of $207.2 million and $207.6 million for the years ended
December 31, 1997 and 1998, respectively. Those statements were audited by other
auditors  whose  report  thereon  has  been  furnished  to us,  and our  opinion
expressed herein, insofar as it relates to the amounts included for Sintel, S.A.
is based solely on the report of the other auditors.  We conducted our audits of
the  consolidated  financial  statements in accordance  with generally  accepted
auditing  standards  which  require that we plan and perform the audit to obtain
reasonable  assurance about whether the  consolidated  financial  statements are
free of material  misstatement.  An audit includes  examining,  on a test basis,
evidence  supporting the amounts and disclosures in the  consolidated  financial
statements,  assessing the accounting  principles used and significant estimates
made by management,  and evaluating the overall consolidated financial statement
presentation.  We  believe  that our  audits  and the  report of other  auditors
provide a reasonable basis for the opinion expressed above.
  



/s/ PRICEWATERHOUSECOOPERS LLP
- -------------------------------
PRICEWATERHOUSECOOPERS LLP
Miami, Florida

February 10, 1999



                                       19
<PAGE>

                        REPORT OF INDEPENDENT ACCOUNTANTS


To the Shareholders of
Sistemas e Instalaciones de Telecomunicacion, S.A.:



We have audited the consolidated  balance sheet of SINTEL, S.A. and subsidiaries
("Sintel") as of December 31, 1998 and 1997, the related consolidated statements
of income  and cash  flows for the two years  then  ended,  and the notes to the
financial  statements,   all  expressed  in  Spanish  pesetas.  These  financial
statements are the responsibility of Sintel's management.  Our responsibility is
to express an opinion on these financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

On December 31, 1998,  the  agreement  signed with  Telefonica  de Espana,  S.A.
terminated.  Such contract  guaranteed a minimum contract  revenue amount.  As a
result  of this  situation,  the  Company  has a  strategy  to  restructure  its
operations as well as a planned expansion and  diversification of its commercial
activities in Spain and Latin America, as explained in Note 1.

In  relation  to what is  described  in the  previous  paragraph,  during 1998 a
restructure of its  operations  was executed which resulted in an  extraordinary
expense of 1.810 millions pesetas related to severance payments to personnel. In
view of the extraordinary nature of such restructure,  management  considered it
appropriate  to  compensate  part of such  cost by  reversing  1.000,8  millions
pesetas  from the  voluntary  reserves  with a  corresponding  increase  to 1998
income,  recorded  as  described  in Notes 10 and 18.  Although  such  voluntary
reserves are free to be disposed of by the Board of Directors, Spanish Generally
Accepted  Accounting  Principles  does not permit such reversal and the ultimate
recording of extraordinary income in 1998. Therefore, in accordance with General
Accepted Accounting Principles,  net income and the voluntary reserves should be
reduced and increased,  accordingly,  by 1000,8 millions pesetas. Such treatment
does not impact the capital accounts of the Company.

Certain  accounting  practices  of Sintel  used in  preparing  the  consolidated
financial  statements  of Sintel  conform  with  generally  accepted  accounting
principles in Spain,  but do not conform with  accounting  principles  generally
accepted  in the United  States.  A  description  of these  differences  and the
adjustments  required  to  conform  the  consolidated  financial  statements  to
accounting  principles  generally accepted in the United States are set forth in
Note 22.

In our opinion,  except for the effects of the matter described in the preceding
paragraph 4, the accompanying  consolidated financial statements express, in all
material respects,  the capital and the financial  position of Sintel,  S.A. and
consolidated  subsidiaries  at December  31, 1998 and 1997 and the result of its
operations  for the two years  then ended and  includes  all the  necessary  and
sufficient  information for an adequate  interpretation  and  comprehension,  in
accordance with generally accepted accounting principles applied on a consistent
basis.


/s/ ARTHUR ANDERSEN
- ---------------------
ARTHUR ANDERSEN
Madrid, Spain

March 31, 1999

                                       20
<PAGE>

                                                          
                                  MASTEC, INC.
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                     (In thousands except per share amounts)

<TABLE>
<CAPTION>
                                                        Year Ended December 31,
                                                 ------------------------------------
                                                    1996         1997         1998
                                                 ----------   ----------   ----------
<S>                                              <C>          <C>          <C>
 
Revenue ......................................   $  472,800   $  659,439   $1,048,922
Costs of revenue .............................      352,329      495,840      803,112
Depreciation and amortization ................       12,000       23,855       43,313
Compensation charge ..........................         --           --         33,765
General and administrative expenses ..........       58,529       82,261      140,472
                                                 ----------   ----------   ----------

    Operating income .........................       49,942       57,483       28,260
Interest expense .............................       11,434       11,541       29,580
Interest income ..............................        3,246        1,783        9,093
Other income (expense), net ..................          769        8,332       (5,155)
                                                 ----------   ----------   ----------
Income before provision for income taxes,
    equity in earnings of unconsolidated
    companies and minority interest ..........       42,523       56,057        2,618
Provision for income taxes ...................       15,591       20,944       12,550
Equity in earnings of unconsolidated companies        3,040        2,897        1,906
Minority interest ............................           93       (3,346)      (5,889)
                                                 ==========   ==========   ==========
Net income (loss) ............................   $   30,065   $   34,664   $  (13,915)
                                                 ==========   ==========   ==========

Weighted average common shares outstanding ...       24,703       26,460       27,489
Basic earnings (loss) per share ..............   $     1.22   $     1.31   $    (0.51)

Weighted average common shares outstanding ...       25,128       27,019       27,489
Diluted earnings (loss) per share ............   $     1.20   $     1.28   $    (0.51)
</TABLE>




     The accompanying notes are an integral part of these consolidated financial
statements.
                                       21
<PAGE>

                                  MASTEC, INC.
                           CONSOLIDATED BALANCE SHEETS
                                 (In thousands)
<TABLE>
<CAPTION>
                                                                     December 31,
                                                              ----------------------
                                                                 1997         1998
                                                              ---------    ---------
<S>                                                           <C>          <C>
         Assets

Current assets:
    Cash and cash equivalents ..............................  $   6,063    $  19,864
    Accounts receivable, unbilled revenue and retainage, net    346,596      284,575
    Inventories ............................................      8,746       13,423
    Assets held for sale ...................................     10,782       49,973
    Other current assets ...................................     22,009       59,601
                                                              ---------    ---------
         Total current assets ..............................    394,196      427,436

Property and equipment, net ................................     86,109      142,897
Investments in unconsolidated companies ....................     48,160        5,886
Intangibles, net ...........................................     99,890      142,245
Other assets ...............................................      1,869       17,022
                                                              ---------    ---------
         Total assets ......................................  $ 630,224    $ 735,486
                                                              =========    =========

         Liabilities and Shareholders' Equity

Current liabilities:
    Current maturities of debt .............................  $  54,562    $  11,143
    Accounts payable and accrued expenses ..................    166,596       84,372
    Other current liabilities ..............................     48,950       87,417
                                                              ---------    ---------
         Total current liabilities .........................    270,108      182,932
                                                              ---------    ---------

Other liabilities ..........................................     41,924       37,592
                                                              ---------    ---------
Long-term debt .............................................     94,495      310,689
                                                              ---------    ---------
Commitments and contingencies (Note 10)

Shareholders' equity:
    Common stock ...........................................      2,758        2,738
    Capital surplus ........................................    154,013      149,479
    Retained earnings ......................................     70,392       56,477
    Accumulated other comprehensive income .................     (3,466)      (4,421)
                                                              ---------    ---------
         Total shareholders' equity ........................    223,697      204,273
                                                              ---------    ---------
         Total liabilities and shareholders' equity ........  $ 630,224    $ 735,486
                                                              =========    =========
</TABLE>

     The accompanying notes are an integral part of these consolidated financial
statements.
                                       22
<PAGE>

                                  MASTEC, INC.
            CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY
                                 (In thousands)
<TABLE>
<CAPTION>
                                                                                       Foreign                          Accumulated
                                                 Common Stock                         Currency                             Other
                                               -----------------   Capital  Retained Translation  Treasury             Comprehensive
                                                Shares   Amount    Surplus  Earnings Adjustments    Stock     Total        Income
<S>                                             <C>     <C>       <C>       <C>       <C>         <C>       <C>          <C>
- ---------------------------------------------------------------------------------------------------------------------   ------------
Balance December 31, 1995 ...................   26,435  $  2,643  $134,186  $  5,663  $      1    $(91,989) $ 50,504    $     5,664
Net income ..................................                                 30,065                          30,065         30,065
Foreign currency translation adjustment .....                                             (803)                 (803)          (803)
Stock issued from treasury for stock
    options exercised .......................                           48                             523       571           --
Tax benefit resulting from stock
    option plan .............................                          513                                       513           --
Stock issued from treasury for an
    acquisition .............................                        8,844                           2,201    11,045           --
Stock issued for debentures from
    treasury ................................                        5,492                           6,117    11,609           --
- ---------------------------------------------------------------------------------------------------------------------   ------------
Balance December 31, 1996 ...................   26,435     2,643   149,083    35,728      (802)    (83,148)  103,504         34,926
Net income ..................................                                 34,664                          34,664         34,664
Foreign currency translation adjustment .....                                           (2,664)               (2,664)        (2,664)
Stock issued from treasury for options                                    
    exercised ...............................                          206                             979     1,185           --
Tax benefit resulting from stock
    option plan .............................                        1,538                                     1,538           --
Stock issued for acquisitions ...............    1,621       162    76,219                                    76,381           --
Stock issued from treasury for an                                 
    acquisition .............................                        4,479                           1,603     6,082           --
Stock issued for stock dividend from
    treasury ................................                      (75,802)                         75,802      --             --
Stock issued from treasury ..................                        3,007                                     3,007           --
- ---------------------------------------------------------------------------------------------------------------------   ------------
Balance December  31, 1997 ..................   28,056     2,805   158,730    70,392    (3,466)     (4,764)  223,697         66,926
Retirement of treasury stock ................     (476)      (47)   (4,717)     --        --         4,764      --             --
                                               --------  -------- --------- --------- ---------   --------- ---------   ------------
Balance December 31, 1997 ...................   27,580     2,758   154,013    70,392    (3,466)       --     223,697         66,926
Net loss ....................................                                (13,915)                        (13,915)       (13,915)
Accumulated other comprehensive income                                                    (955)                 (955)          (955)
Stock issued, primarily for 
    acquisitions and stock options            
    exercised ...............................      469        47     8,721                                     8,768           --
Tax benefit resulting from stock                                   
    option plan .............................                          403                                       403           --
Repurchase of common stock ..................     (667)      (67)  (13,658)                                  (13,725)          --
- ---------------------------------------------------------------------------------------------------------------------   ------------
Balance December 31, 1998 ...................   27,382  $  2,738  $149,479  $ 56,477  $ (4,421)   $   --   $ 204,273    $    52,056
=====================================================================================================================   ============
</TABLE>

     The accompanying notes are an integral part of these consolidated financial
statements.
                                       23
<PAGE>

                                  MASTEC, INC.
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (In thousands)
<TABLE>
<CAPTION>
                                                                Year Ended December 31,
                                                          ------------------------------------
                                                             1996         1997         1998
                                                          ----------   ----------   ----------
<S>                                                       <C>          <C>          <C>
Cash flows from operating activities:
   Net income (loss) ..................................   $  30,065    $  34,664    $ (13,915)
   Adjustments to reconcile net income (loss) to net 
     cash provided by (used in) operating activities:
     Depreciation and amortization ....................      12,000       23,855       43,313
     Minority interest ................................         (93)       3,346        5,889
     Equity in earnings of unconsolidated companies ...      (3,040)      (2,897)      (1,906)
     Deferred tax expense (benefit) ...................       2,574       (4,991)       6,974
     (Gain) loss on sale of assets ....................        (365)      (6,848)       8,918
     Changes in assets and liabilities net of 
       effect of acquisitions and divestitures:
       Accounts receivable, unbilled revenue and retainage  (12,013)     (28,809)     (34,942)
       Inventories and other current assets ...........      (2,448)          64      (16,759)
       Other assets ...................................      (2,102)     (10,889)     (27,341)
       Accounts payable and accrued expenses ..........      24,492        5,348       (2,017)
       Other current liabilities ......................      (6,706)       7,326       13,385
       Other liabilities ..............................      (4,942)      (4,988)       4,548
                                                          ----------   ----------   ----------
Net cash provided by (used in) operating activities ...      37,422       15,181      (13,853)
                                                          ----------   ----------   ----------
Cash flows from investing activities:
    Capital expenditures ..............................      (7,059)     (21,534)     (76,445)
    Cash paid for acquisitions, net of cash acquired ..      (5,034)     (45,606)     (75,745)
    Distributions from unconsolidated companies .......        --          2,130         --
    Investments in unconsolidated companies ...........      (1,212)      (3,364)     (13,384)
    Repayment (advances)  of notes receivable, net ....       1,273          565      (18,667)
    Repayment of notes from shareholders ..............        --            780         --
    Net proceeds from sale of assets ..................       9,404       29,628        5,600
                                                          ----------   ----------   ----------
Net cash used in investing activities .................      (2,628)     (37,401)    (178,641)
                                                          ----------   ----------   ----------
Cash flows from financing activities:
    Proceeds from revolving credit facilities .........      17,476       57,328        5,032
    Proceeds from Senior Notes ........................        --           --        199,724
    Other borrowings ..................................      21,739       19,936       35,106
    Debt repayments ...................................     (70,320)     (59,059)     (17,946)
    Proceeds from issuance of common stock ............         792        6,264        3,779
    Stock repurchased .................................        --           --        (13,725)
    Financing costs ...................................        --           (587)      (4,993)
                                                          ----------   ----------   ----------
Net cash (used in) provided by financing activities ...     (30,313)      23,882      206,977
                                                          ----------   ----------   ----------
Net increase in cash and cash equivalents .............       4,481        1,662       14,483
Net effect of translation on cash .....................        (803)        (353)        (682)
Cash and cash equivalents - beginning of period .......       1,076        4,754        6,063
                                                          ----------   ----------   ----------
Cash and cash equivalents - end of period .............   $   4,754    $   6,063    $  19,864
                                                          ==========   ==========   ==========

Supplemental  disclosures of cash flow information:  
Cash paid during the period for:
    Interest                                              $  10,029    $   8,727    $  21,795
                                                          ==========   ==========   ==========
    Income taxes                                          $  11,676    $  10,377    $   6,593
                                                          ==========   ==========   ==========
</TABLE>

     The accompanying notes are an integral part of these consolidated financial
statements.
                                       24
<PAGE>

                                  MASTEC, INC.
                CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)
                                 (In thousands)


Supplemental disclosure of non-cash investing and financing activities:

                                                     Year Ended December 31,
                                               -------------------------------
                                                  1996       1997       1998
                                               ---------   --------   --------
Acquisitions accounted for under purchase 
  method of accounting:
     Fair value of assets acquired:
     Accounts receivable ....................   $248,087   $ 43,966   $ 35,184
     Inventories ............................      2,980      1,681      2,565
     Other current assets ...................     12,661      2,127      1,615
     Property and equipment .................     13,148     27,480     27,168
     Investments in unconsolidated companies       9,373       --         --
     Real estate and other assets ...........      6,385      3,973      3,830
                                                --------   --------   --------
       Total non-cash assets ................    292,634     79,227     70,362
                                                --------   --------   --------
Liabilities .................................    162,928     32,238     20,623
Long-term debt ..............................     78,966      8,535     18,609
                                                --------   --------   --------
       Total liabilities assumed ............    241,894     40,773     39,232
                                                --------   --------   --------
Net non-cash assets acquired ................     50,740     38,454     31,130
Cash acquired ...............................      1,130      3,304      4,975
                                                --------   --------   --------
Fair value of net assets acquired ...........     51,870     41,758     36,105
Excess over fair value of assets acquired ...      4,956     98,088     55,314
                                                --------   --------   --------
Purchase price ..............................   $ 56,826   $139,846   $ 91,419
                                                ========   ========   ========

Notes payable issued in acquisitions ........   $ 36,561   $    130   $ 10,199
Acquisition costs, cash paid and common 
  stock is acquisitions .....................     18,015    129,809     81,220
Contingent consideration ....................      2,250      9,907       --
                                                --------   --------   --------
Purchase price ..............................   $ 56,826   $139,846   $ 91,419
                                                ========   ========   ========
Property acquired through financing arrangements$  8,550   $    413   $   --
                                                ========   ========   ========
Disposal of Sintel:
   Accounts receivable ...........................................    $137,214
   Inventories ...................................................       2,774
   Other current assets ..........................................      37,722
   Property and equipment ........................................      17,251
   Other assets ..................................................       2,825
                                                                      --------
     Total non-cash assets .......................................     197,786
                                                                      --------
Liabilities ......................................................     109,448
Long-term debt ...................................................      25,013
                                                                      --------
     Total liabilities ...........................................     134,461
                                                                      --------
Net non-cash assets sold .........................................      63,325
Cash .............................................................       2,234
Investment retained ..............................................      (4,072)
                                                                      --------
Fair value of net assets sold ....................................      61,487
Net loss on sale .................................................      (9,222)
                                                                      --------
Sale price .......................................................    $ 52,265
                                                                      ========
Assumption of debt ...............................................      25,013
Seller financing .................................................      27,252
                                                                      --------
Sale price .......................................................    $ 52,265
                                                                      ========

     The accompanying notes are an integral part of these consolidated financial
statements. 
                                       25
<PAGE>

                                   MASTEC, INC
                CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)


     In 1996, MasTec issued approximately  198,000 shares of common stock for an
acquisition. Common stock was issued from treasury at a cost of $2.2 million.

     In 1996, MasTec converted $11.6 million of its 12% convertible subordinated
debentures into common stock. Common stock was issued from treasury at a cost of
$6.1 million.

     In 1996,  MasTec's  purchase of an additional 3% interest in Supercanal was
financed in part by the sellers for $2 million.

     In 1997, MasTec issued  approximately  1,621,000 shares of common stock for
domestic  acquisitions,  of which 250,000 shares were issued from treasury stock
at a cost of approximately $1.6 million.

     In 1997,  MasTec  converted a note receivable and accrued  interest thereon
totaling $29 million into stock of
Conecel.

     In 1998,  MasTec  issued  approximately  158,200  shares  of  common  stock
primarily as payment for contingent  consideration related to 1997 acquisitions.
In addition,  MasTec  issued  approximately  58,600 shares as bonuses to certain
employees and fees to directors.



     The accompanying notes are an integral part of these consolidated financial
statements. 
                                       26
<PAGE>

                                  MASTEC, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                        December 31, 1996, 1997 and 1998


     Note 1 - Nature of the  Business  and  Summary  of  Significant  Accounting
Policies

     MasTec is one of the  preeminent  builders of internal and external  voice,
video, data, internet and other computer and communications networks for leading
telecommunications  service providers,  cable television operators,  Fortune 500
corporations  and power  companies.  MasTec  designs,  installs,  constructs and
maintains aerial,  underground and buried copper,  coaxial and fiber optic cable
networks as well as wireless antenna  networks  ("external  network  services").
Clients for  MasTec's  external  network  services  include  major  domestic and
international  telecommunication  service  providers,  incumbent and competitive
local exchange carriers, cable television operators,  long-distance carriers and
wireless phone companies.  MasTec also provides external network services to the
electric power  industry  ("power") that are similar to the services it provides
to  telecommunications  customers.  Additionally,  MasTec designs,  installs and
maintains   integrated  local  and  wide  area  networks  and  provides  systems
integration  and other value added services  ("internal  network  services") for
corporate customers and other organizations with multiple locations.
 
     For the years ended, December 31, 1996, 1997 and 1998, revenue expressed as
a percentage of North American  revenue,  generated by external network services
for   telecommunications   service   providers  was  77.1%,   74.6%  and  68.1%,
respectively,  by external  network  services for electric  power  companies was
1.3%, 5.2% and 18.0%, respectively,  and by internal network services was 12.5%,
12.5% and 13.4%,  respectively.  MasTec  operated in 1998  principally  in North
America (the United States and Canada), the Caribbean and Latin America ("CALA")
and in Spain (CALA and Spain combined are also referred to as  "International").
Combined revenue generated by International operations, as a percentage of total
revenue was 39.8% in 1996, 42.8% in 1997 and 36.2% in 1998.  See Note 9.

     On December 31, 1998, MasTec sold its Spanish  operations,  whose principal
customer was Telefonica.

     In July and August 1997, MasTec  consummated two  acquisitions,  which were
accounted for as pooling of interests.  In July 1998,  MasTec  applied  purchase
accounting  to  these   acquisitions  due  to  transactions   contemplated  with
management of such  acquired  companies  that were later  finalized in 1998 (see
Note 2). Accordingly,  MasTec's  consolidated  financial  statements include the
results of operations from the dates of such  acquisitions  and prior years have
been adjusted  accordingly.  The change in  accounting  resulted in increases in
capital  surplus and  intangibles  assets of  approximately  $53.0 million as of
December  1997.  As to the statement of income,  the restated 1997 revenue,  net
income and  earnings  per share are $659.4  million,  $34.7  million  and $1.28,
respectively,  in  comparison  to the  originally  reported  amounts  of  $703.4
million, $42.7 million and $1.44, respectively.

     A  summary  of  the  significant   accounting   policies  followed  in  the
preparation of the accompanying  consolidated  financial statements is presented
below:

     Management's   estimates.   The  preparation  of  financial  statements  in
conformity with generally accepted accounting  principles requires management to
make estimates and  assumptions  that affect the reported  amounts of assets and
liabilities  and disclosure of contingent  assets and liabilities at the date of
the  financial  statements  and the  reported  amounts of revenues  and expenses
during the reporting period.  The more significant  estimates relate to MasTec's
reserve for allowance for bad debts,  accrued workers'  compensation claims, and
the  realizability  of  certain  intangibles  and assets  held for sale.  Actual
results could differ from those estimates.

     Principles of consolidation.  The consolidated financial statements include
MasTec,  Inc.  and its  subsidiaries.  All  material  intercompany  accounts and
transaction  have  been  eliminated.   Certain  prior  year  amounts  have  been
reclassified to conform to the current presentation.

     Comprehensive income (loss). As reflected in the consolidated  statement of
changes in shareholders' equity, comprehensive income is a measure of net income
and all other  changes in equity of MasTec that result from  transactions  other
than with  shareholders.  Comprehensive  income  (loss)  consists  of net income
(loss) and foreign currency translation adjustments.

     Foreign currency. Assets and liabilities of foreign subsidiaries and equity
with a functional  currency  other than U.S.  dollars are  translated  into U.S.
dollars at exchange rates in effect at the end of the reporting period.  Foreign
entity  revenue and expenses  are  translated  into U.S.  dollars at the average

                                       27
<PAGE>

rates that prevailed during the period.  The resulting net translation gains and
losses are reported as foreign currency translation adjustments in shareholders'
equity as a component of other accumulated  comprehensive income. Exchange gains
and losses on transactions of MasTec and its equity investments denominated in a
currency other than their functional  currency are generally included in results
of operations as incurred.
 
     International  Operations.  MasTec  owns  interest  in a number or  foreign
operations,  primarily in Latin America, which are subject to greater political,
monetary,  economic and regulatory  risks than its domestic  operations.  During
January  1999 the  Brazilian  government  allowed its  currency to trade  freely
against other currencies resulting in an immediate  devaluation of the Brazilian
reais.   The  impact  of  the  devaluation  on  an  operation   depends  on  the
devaluation's  effect on the local  economy and the ability of an  operation  to
raise  prices  and/or  reduce  expenses.  Additionally,  the  economies of other
countries in Latin America could be adversely  impacted by Brazil's economic and
monetary  problems.  The  likelihood  and  extent  of  further  devaluation  and
deteriorating economy conditions in Brazil and other Latin America countries and
the resulting impacts on MasTec's results of operations,  financial position and
cash flows is not known.
  
     Revenue recognition.  Revenue and related costs for short-term construction
projects (i.e.,  generally  projects with a duration of less than one month) are
recognized as the projects are completed. Revenue generated by certain long-term
construction contracts are accounted for by the percentage-of-completion  method
under which income is recognized  based on the ratio of estimated  cost incurred
to total estimated contract cost. Losses, if any, on such contracts are provided
for in full when they become  known.  Billings in excess of costs and  estimated
earnings on  uncompleted  contracts are classified as current  liabilities.  Any
costs in excess of billings are classified as current assets. Work in process on
contracts  is  based  on work  performed  but not  billed  to  customers  as per
individual contract terms.

     MasTec   also   provides   management,    coordination,    consulting   and
administration  services  for  construction  projects.   Compensation  for  such
services is recognized ratably over the term of the service agreement.

     Earnings per share. Basic earnings per common share is computed by dividing
income available to common shareholders by the weighted average number of common
shares  outstanding.  Diluted  earnings  per common  share  include the dilutive
effect of stock options using the treasury stock method.  The difference between
the weighted  average  common  shares  outstanding  used to calculate  basic and
diluted earnings relates to options assumed  exercised under the treasury method
of  accounting  of  approximately  425,000 and 559,000 at December  31, 1996 and
1997, respectively.

     Potentially  dilutive  shares,  as of December 31, 1998 which have not been
included in the diluted per share  calculation  include  336,000  shares because
their  effects  would be  anti-dilutive  due to the  loss  incurred  by  MasTec.
Accordingly,  for 1998,  diluted net loss per common  share is the same as basic
net loss per common share.

     Cash and cash equivalent.  MasTec considers all short-term investments with
maturities of three months or less when purchased to be cash equivalents. MasTec
places  its  temporary  cash  investments  with high  credit  quality  financial
institutions.  At times,  such  investments  may be in  excess  of the  F.D.I.C.
insurance  limits.  MasTec  has not  experienced  any  loss  to  date  on  these
investments.  At  December  31,  1998,  MasTec had cash and cash  equivalent  in
Brazilian reais of approximately $9.1 million.

     Inventories.  Inventories (consisting principally of material and supplies)
are carried at the lower of first-in, first-out cost or market.

     Property  and  equipment.  Property  and  equipment  are  recorded at cost.
Depreciation and amortization are computed using the  straight-line  method over
the estimated useful lives of the respective assets.  Leasehold improvements are
amortized  over the  shorter  of the term of the lease or the  estimated  useful
lives of the improvements.  Expenditures for repairs and maintenance are charged
to expense as incurred.  Expenditures for betterments and major improvements are
capitalized.  The  carrying  amounts  of  assets  sold or  retired  and  related
accumulated  depreciation  are  eliminated  in the  year  of  disposal  and  the
resulting gains and losses are included in income.

     Intangibles and other long lived assets. Assets and liabilities acquired in
connection  with business  combinations  accounted for under the purchase method

                                       28
<PAGE>

are recorded at their respective estimated fair values.  Goodwill represents the
excess  of the  purchase  price  over the  estimated  fair  value of net  assets
acquired,  including  the  recognition  of  applicable  deferred  taxes,  and is
amortized  on a  straight-line  basis over a period  ranging from 5 to 40 years,
with a weighted  average  amortization  period of 22 years. At December 31, 1997
and 1998, MasTec had recorded  intangibles,  primarily consisting of goodwill of
$99.9 million and $142.2 million,  respectively (net of accumulated amortization
of $3.5 million in 1997 and $14.9 million in 1998).

     MasTec reviews long-lived assets, identifiable intangibles and goodwill and
reserves for impairment  whenever  events or changes in  circumstances  indicate
that  the  carrying  amount  of  the  assets  may  not  be  fully   recoverable.
Recoverability  of assets to be held and used is measured by a comparison of the
carrying amount of the assets to future  undiscounted net cash flows expected to
be generated by the assets.  If such assets are  considered to be impaired,  the
impairment  to be  recognized  is measured  by the amount by which the  carrying
amount of the assets  exceeds  the fair value of the assets or  expected  future
cash flows on an  undiscounted  basis.  Assets to be disposed of are reported at
the lower of the carrying amount or fair value less costs to sell.

     Accrued insurance. MasTec is self-insured for certain property and casualty
and worker's  compensation  exposure  and,  accordingly,  accrues the  estimated
losses not otherwise covered by insurance.

     Income taxes.  MasTec  records  income taxes using the liability  method of
accounting for deferred income taxes. Under this method, deferred tax assets and
liabilities  are recognized for the expected future tax consequence of temporary
differences  between the  financial  statement  and income tax bases of MasTec's
assets and  liabilities.  A valuation  allowance is established  when it is more
likely than not that any or all of the deferred tax assets will not be realized.

     Stock based  compensation.  MasTec  adopted  the  disclosure  provision  of
Statement of Financial  Accounting  Standard No. 123, Accounting for Stock Based
Compensation  ("SFAS 123") and retained the intrinsic value method of accounting
for such stock based compensation (see Note 6).

     Fair value of financial instruments. MasTec estimates the fair market value
of financial  instruments  through the use of public market prices,  quotes from
financial institutions and other available information.  Judgment is required in
interpreting data to develop estimates of market value and, accordingly, amounts
are not  necessarily  indicative  of the amounts that MasTec could  realize in a
current market exchange.  MasTec's short-term financial  instruments,  including
cash and cash equivalents,  accounts and notes receivable,  accounts payable and
other liabilities, consist primarily of instruments without extended maturities,
the fair value of which, based on management's estimates, equaled their carrying
values.  Long-term  debt is carried at face  value  less  unamortized  discount,
$199.8 million at December 31, 1998. The fair value of MasTec's Senior Notes was
approximately $195.0 million at December 31, 1998. MasTec uses letters of credit
to back certain insurance policies.  The letters of credit reflect fair value as
a condition of their  underlying  purpose and are subject to fees  competitively
determined in the market place.

Note 2  -  Acquisitions and Investing Activities

     During  1997  and  1998,   MasTec   completed  11  and  12  North   America
acquisitions,  respectively,  which have been  accounted  for under the purchase
method of  accounting.  Accordingly,  the  results  of  operations  of  acquired
companies have been included in MasTec's consolidated results of operations from
their respective  acquisition  dates.  Contingent  consideration,  to the extent
earned,  will be recorded as additional  goodwill.  If the acquisitions had been
made at the beginning of 1997 or 1998, pro forma results of operations would not
have differed  materially  from actual  results based on historical  performance
prior to their  acquisition  by MasTec.  Acquisitions  made in 1998  were:  M.E.
Hunter,  Inc. of Atlanta,  Georgia, C & S Directional  Boring,  Inc. of Purcell,
Oklahoma, Office Communications Systems, Inc. of Inglewood, California, Phasecom
Systems,  Inc. of Toronto,  Canada,  P&E Electric  Company,  Inc. of  Nashville,
Tennessee,   Lessard-Nyren  Utilities,  Inc.  of  Hugo,  Minnesota,   Electronic
Equipment Analyzers,  Inc. of Raleigh, North Carolina,  Cotton and Taylor of Las
Vegas, Nevada,  Stackhouse,  Inc. of Goldsboro, North Carolina, Martin Telephone
Contractors,  Inc. of Cades, South Carolina, Barkers CATV Construction,  Inc. of
Burleson,  Texas  and  Fiber  and  Cable  Works,  Inc.  of  Roanoke,   Virginia,
telecommunications   infrastructure  and  utility  contractors  with  operations
primarily in the western,  northern and  southeastern  United  States as well as
Canada. Of the total 1998 acquisitions, eight, two and two pertained to external
network   services,   power  and  internal   network   services,   respectively.
Additionally,  MasTec made four international acquisitions of telecommunications
infrastructure  contractors:  CIDE Engenharia Ltda. of Brazil, Acietel Mexicana,
S.A. of Mexico, Artcom Services, Inc. of Puerto Rico ("Artcom") and Proyco Ltda.
of Colombia  ("Proyco").  During 1998, MasTec sold 87% of its Spanish operations
which included Artcom and Proyco.

                                       29
<PAGE>

     MasTec entered into agreements with certain senior management  personnel at
two  of its  operating  subsidiaries.  These  senior  managers  have  agreed  to
multi-year    employment    agreements   and   10-year    non-competition    and
non-solicitation  agreements.  Under the definitive agreements,  MasTec paid the
senior managers  compensation in the form of cash and common stock options.  The
cash portion totals  approximately  $33.3 million,  of which approximately $13.3
million was paid in 1998 and  approximately  $20.0 million was paid in the first
quarter  of  1999.  As  a  result  of  these   agreements,   MasTec  recorded  a
non-recurring  compensation charge of approximately $33.8 million (including the
value of vested stock  options) in the fourth quarter of 1998.  Additionally  at
December  31,  1998,  MasTec  had  approximately  $7.1  million  due from  these
employees which was received during February 1999.

     On April 30, 1996,  MasTec purchased from  Telefonica,  100% of the capital
stock of  Sistemas e  Instalaciones  de  Telecomunicacion,  S.A.  ("Sintel"),  a
company engaged in  telecommunications  infrastructure  construction services in
Spain, Argentina, Chile, and Peru. In Argentina, Chile and Peru, MasTec operated
through unconsolidated corporations in which it held a 50% interest. On December
31, 1998, MasTec sold 87% of its Spanish operations to a group of investors. The
investor  group included the chief  executive  officer of Sintel and a member of
its board of directors.  MasTec  received $0.9 million (130.5 million pesetas at
an  exchange  rate of 142  pesetas to the  dollar)  on the date of  closing  and
through  March 31, 1999 has  received  $10.2  million.  Payment  terms are being
re-negotiated not to extend beyond 1999. The sale included the assumption of the
remaining  indebtedness  of MasTec to Telefonica for the purchase of the Spanish
operations of $25.0 million (3.6 billion pesetas).

     On July 31, 1997,  MasTec completed its acquisition of 51% of MasTec Inepar
S/A-Sistemas de  Telecomunicacoes  ("MasTec  Inepar"),  a newly formed Brazilian
telecommunications  infrastructure contractor, for 250,000 of MasTec's shares of
common  stock  and  $29.4  million  in  cash,  of  which  $7.3  million  remains
outstanding.

     Subsequent  to December  31, 1998,  MasTec has signed  letters of intent to
acquire two external  network and one  internal  network  services  contractors,
subject to a number of conditions.

Note 3  - Accounts Receivable

     Accounts receivable are presented net of an allowance for doubtful accounts
of $3.1 million,  $3.1 million,  and $7.3 million at December 31, 1996, 1997 and
1998,  respectively.  MasTec recorded a provision for doubtful  accounts of $1.2
million, $0.7 million and $4.5 million during 1996, 1997 and 1998, respectively.
In addition,  MasTec recorded write-offs of $0.1 million,  $0.7 million and $0.3
million during 1996, 1997 and 1998, respectively.
  
     Accounts  receivable include retainage which has been billed but is not due
until  completion of  performance  and  acceptance by customers,  and claims for
additional work performed outside original contract terms.  Retainage aggregated
$10.2 million and $16.1 million at December 31, 1997 and 1998, respectively.

     Included in accounts  receivable  is unbilled  revenue of $97.5 million and
$83.3 million at December 31, 1997 and 1998, respectively. Such unbilled amounts
represent  work  performed  but not  billable  to  customers  as per  individual
contract  terms,  of which $49.5  million and $45.2 million at December 31, 1997
and 1998, respectively, are related to MasTec's Brazilian operations.

     During 1998, MasTec entered into a financing agreement to provide financing
to a customer.  As of December 31, 1998,  MasTec had $41.8  million  outstanding
under this agreement,  of which approximately $30.0 million and $11.8 million is
reflected in accounts receivable and other current assets, respectively,  in the
accompanying  consolidated  balance  sheet as of December 31, 1998.  MasTec will
terminate the financing agreement as of April 30, 1999.

                                       30
<PAGE>

Note 4  -  Property and Equipment

     Property and  equipment  is  comprised of the  following as of December 31,
1997 and 1998 (in thousands):

                                                         Estimated
                                                        Useful Lives
                                    1997        1998     (In Years)
                                 ---------    ---------  ----------
Land .........................   $   8,430    $  10,230
Buildings and improvements ...       9,474       11,291    5 - 20
Machinery and equipment ......      97,727      170,922    3 - 7
Office furniture and equipment       5,810        9,319    3 - 5
                                 ---------    ---------
                                   121,441      201,762
Less-accumulated depreciation      (35,332)     (58,865)
                                 ---------    ---------
                                 $  86,109    $ 142,897
                                 =========    =========
Note 5  -  Debt

     Debt is comprised of the following at December 31, (in thousands):
<TABLE>
<CAPTION>
                                                                      1997        1998
                                                                   ---------    ---------
<S>                                                                <C>          <C>
Revolving Credit Facility, at LIBOR plus 1.50% (6.96%
   at December 31, 1997 and 7.06% at December 31, 1998) ........   $  83,010    $ 106,300
Revolving Credit Facility, at MIBOR plus 0.30 (5.60% at       
   December 31, 1997) ..........................................      10,894         --
Other Spanish bank facilities at interest rates from
   5.65% to 6.75% ..............................................      17,438         --
Other bank facilities at LIBOR plus 1.25% (6.31% at 
   December 31, 1998)...........................................        --          6,206
Notes payable for equipment, at interest rates from 7.5% to 8.5%      
   due in installments through the year 2000 ...................      14,500        6,145
Notes payable for acquisitions, at interest rates from 7% to 8%       
   due in installments  through February 2000 ..................      23,215        3,431
Senior Notes, 7.75% due February 2008 ..........................        --        199,750
                                                                   ---------    ---------

Total debt .....................................................     149,057      321,832
Less current maturities ........................................     (54,562)     (11,143)
                                                                   ---------    ---------

Long-term debt .................................................   $  94,495    $ 310,689
                                                                   =========    =========
</TABLE>
 
     In June 1997, MasTec entered into a revolving line of credit agreement with
a group of banks as  amended,  (the  "Credit  Facility").  The  Credit  Facility
provides for  borrowings up to an aggregate  amount of $165.0  million.  Amounts
outstanding  under the revolving  credit  facility  mature on June 9, 2000. Upon
written request by MasTec and at the bank's sole  discretion,  the maturity date
of the Credit  Facility may be extended for  successive  annual  periods up to a
final  maturity  date of June 9,  2002.  MasTec  is  required  to pay an  unused
facility fee ranging from .25% to .50% per annum on the facility, depending upon
certain financial covenants.
 
     The Credit Facility is secured by a pledge of shares of certain of MasTec's
subsidiaries.  Interest  under the Credit  Facility  accrues at rates based,  at
MasTec's  option,  on the  agent  bank's  Base  Rate plus a margin of up to .50%
depending on certain financial covenants or 1% above the overnight federal funds
effective rate, whichever is higher, or its LIBOR Rate (as defined in the Credit
Facility)  plus a margin  of 1.00% to  2.25%,  depending  on  certain  financial
covenants.

     MasTec had  outstanding  $18.7  million in standby  letters of credit as of
December 31, 1998.

     On  January  30,  1998,   MasTec  issued  $200.0   million,   7.75%  senior
subordinated  notes (the "Senior  Notes") due in February 2008 with interest due
semi-annually.  The net proceeds were used primarily for  acquisitions and other
corporate purposes.

                                       31
<PAGE>
 
     The  Credit  Facility  and the Senior  Notes  contain  customary  events of
default and covenants which prohibit,  among other things, making investments in
excess of a specified amount,  incurring additional  indebtedness in excess of a
specified  amount,  paying  dividends  in excess of a specified  amount,  making
capital expenditures in excess of a specified amount,  creating liens, prepaying
other indebtedness,  including the Senior Notes, and engaging in certain mergers
or  combinations  without the prior written  consent of the lenders.  The Credit
Facility  also  provides  that  MasTec must  maintain  certain  financial  ratio
coverage, requiring, among other things minimum ratios at the end of each fiscal
quarter of debt to earnings and earnings to interest expense.
  
     At December 31, 1998 debt matures as follows:

        1999                         $        11,143
        2000                                 109,063
        2001                                   1,503
        2002                                     345
        2003                                      28
        Thereafter                           199,750
                                     ----------------
                                     $       321,832
                                     ================

Note 6  -  Stock Option Plans

     Shares  underlying  stock options and exercise prices have been adjusted to
reflect  the  three-for-two  stock  split  declared  in  1997  by the  Board  of
Directors.  MasTec's  only stock  option  plans  currently in effect is the 1994
Stock  Incentive  Plan (the  "1994  Plan") and the 1994  Stock  Option  Plan for
Non-Employee Directors (the "Directors' Plan"). Under MasTec's 1976 stock option
plan,  there are 5,250 shares available for grant and have been reserved for and
may still be issued in accordance with the terms of such plan.

     The 1994 Plan authorizes the grant of options or awards of restricted stock
up to 2,500,000  shares of MasTec's common stock, of which 500,000 shares may be
awarded as  restricted  stock.  As of  December  31,  1998,  options to purchase
1,567,695 (net of 464,255 stock options cancelled) shares had been granted under
the 1994 Plan. Options are exercisable at prices and over periods established by
the  Compensation  Committee of the Board of Directors  and must be exercised no
later than 10 years from the date of grant.

     The  Directors'  Plan  authorizes  the grant of options to  purchase  up to
600,000 shares of MasTec's common stock to the non-employee  members of MasTec's
Board of  Directors.  Options to purchase  142,500  shares have been  granted to
Board members through 1998. The options granted become exercisable  ratably over
a three year period from the date of grant and may be exercised  for a period of
up to ten years  beginning the year after the date of grant at an exercise price
equal to the fair market value of such shares on the date the option is granted.

     In addition, during 1994 options to purchase 150,000 shares of common stock
at $3.83 per share were  granted to a director  outside the  Directors'  Plan in
lieu of the Director's  Plan and annual fees paid to the director.  Compensation
expense of $42,500  in  connection  with the  issuance  of this  option is being
recognized   annually  over  the  five-year  vesting  period.  The  options  are
exercisable  ratably over a three to five year period  beginning  the year after
the date of grant and may be exercised for a period of up to ten years beginning
the year after the date of grant. In 1997, options to purchase 110,000 shares of
common  stock at fair  market  value on the date of grant  were  granted  to two
executive  officers  outside the 1994 plan.

     In  connection  with two  acquisitions  completed  during 1997,  options to
purchase  800,000 shares of MasTec's  common stock at prices ranging from $17.50
to $20.19 were granted to individuals  during 1998 outside the 1994 Plan subject
to varying vesting schedules.

                                       32
<PAGE>

     The following is a summary of all stock option transactions:

<TABLE>
<CAPTION>
                                                                                                                Weighted
                                                                                                              Average Fair
                                                        Weighted                                                Value of
                                          Stock          Average                                                 Options
                                         Options       Exercise Price               Exercise Price               Granted
                                    ----------------  ---------------  -------------------------------------- --------------
<S>                                 <C>               <C>              <C>                     <C>            <C>
Outstanding December 31, 1995              676,800    $      6.33      $     0.10        -     $    8.92
Granted                                    306,000          17.05            7.42        -          28.58     $ 9.23
Exercised                                  (82,200)          6.38            0.10        -          8.92
Canceled                                    (2,700)          5.29            5.29        -          8.92
                                    ----------------  ---------------  --------------------------------------

Outstanding December 31, 1996              897,900           9.98            0.10        -         28.58
Granted                                  1,254,950          24.96           21.09        -         48.19      $ 19.97
Exercised                                 (201,950)          5.58            0.10        -         21.83
Canceled                                  (343,475)         23.62            5.29        -         48.19
                                    ----------------  ---------------  --------------------------------------

Outstanding December 31, 1997            1,607,425          17.06            0.10        -         31.63
Granted                                  1,234,250          19.17           12.97        -         31.88      $ 13.29
Exercised                                 (101,990)         11.38            1.33        -         21.09
Canceled                                  (110,580)         19.47            5.29        -         31.63
                                    ================  ===============  ======================================
Outstanding December 31, 1998            2,629,105    $     18.32      $     0.10        -     $   31.88
                                    ================  ===============  ======================================


     The following table summarizes  information about stock options outstanding
at December 31, 1998:
</TABLE>
<TABLE>
<CAPTION>

                                        Stock Options Outstanding                             Options Exercisable
                       ------------------------------------------------------------  ---------------------------------------
 
 Range of Exercise      Number of Stock    Weighted              Weighted Average     Number of Stock     Weighted Average
       Prices               Options        Average                   Exercise             Options             Exercise
  
                                                Remaining              Price                                   Price
                                            Contractual Life
- ---------------------  ------------------  --------------------  ------------------  ------------------  -------------------
<S>                    <C>                 <C>                   <C>                 <C>                 <C>  
    .10 - .10                   3,600              4.50          $      0.10                  3,600      $      0.10
   3.83 - 5.29                 94,200              5.19                 4.83                 35,700             5.29
   6.83 - 9.81                327,430              6.41                 8.66                181,330             8.73
  12.97 - 17.50               532,500              9.98                17.34                166,667            17.50
  20.19 - 31.88             1,671,375              8.62                21.32                674,911            21.09
                       ==================  ====================  ==================  ==================  ===================
                            2,629,105              8.49          $     18.32              1,062,208      $     17.82
                       ==================  ====================  ==================  ==================  ===================
</TABLE>
 
     MasTec  has  reflected  below  the  1996,  1997  and  1998  earnings  as if
compensation  expense relative to the fair value of the options granted had been
recorded  under the  provisions  of SFAS No. 123  "Accounting  for Stock-  Based
Compensation."  The fair  value of each  option  grant was  estimated  using the
BlackScholes option-pricing model with the following assumptions used for grants
in 1996,  1997 and 1998,  respectively:  a five, six and five year expected life
for 1996, 1997 and 1998,  respectively;  volatility factors of 57%, 82% and 72%,
respectively; risk-free interest rates of 6.1%, 5.5% and 4.3%, respectively; and
no dividend payments.

                                       33
<PAGE>

     Had  compensation  cost for  MasTec's  options  plans been  determined  and
recorded in accordance  with SFAS No. 123,  MasTec's net income and earnings per
share would have been reduced to the pro forma amounts as follows:

                                          1996       1997        1998
                                       ---------  ---------   ---------
Net income (loss):
As reported ........................   $ 30,065   $ 34,664    $(13,915)
                                       =========  =========   =========
Pro forma ..........................   $ 29,211   $ 28,797    $(28,472)
                                       =========  =========   =========

Basic earnings (loss) per share:
As reported ........................   $   1.22   $   1.31    $  (0.51)
Pro forma ..........................   $   1.18   $   1.09    $  (1.04)

Diluted earnings (loss) per share:
As reported ........................   $   1.20   $   1.28    $  (0.51)
Pro forma ..........................   $   1.16   $   1.07    $  (1.04)

 
     The  1996,  1997 and 1998 pro  forma  effect  on net  income  (loss) is not
necessarily  representative  of the effect in future  years  because it does not
take into  consideration pro forma  compensation  expense related to grants made
prior to 1995 and does not  reflect a tax  benefit  related to the  compensation
expense given that the options are considered  incentive  stock options and such
benefit, if any, cannot be presently determined.
  
Note 7  -  Income Taxes

     The  provision  (benefit)  for income taxes  consists of the  following (in
thousands):

                                1996        1997      1998
                             --------    --------   --------
Current:
  Federal ................   $ 10,891    $  9,583   $  3,198
  Foreign ................      5,347       4,465      1,376
  State and local ........      1,536       1,670      1,002
                             --------    --------   --------
                               17,774      15,718      5,576
                             --------    --------   --------

Deferred:
  Federal ................     (1,965)      2,730      2,119
  Foreign ................       --         2,040      5,430
  State and local ........       (218)        456       (575)
                             --------    --------   --------
                               (2,183)      5,226      6,974
                             --------    --------   --------
Provision for income taxes   $ 15,591    $ 20,944   $ 12,550
                             ========    ========   ========

                                       34
<PAGE>

     The tax effects of significant  items comprising  MasTec's net deferred tax
liability as of December 31, 1997 and 1998 are as follows (in thousands):

                                                    1997       1998
                                                  --------    --------
Deferred tax assets:
    Non-compete ...............................   $   --      $  5,951
    Bad debts .................................      1,104       5,680
    Accrued self insurance ....................      2,100       4,566
    Operating loss and tax credit carry forward      1,565       1,186
    All other .................................      6,446       6,603
                                                  --------    --------
Total deferred tax assets .....................     11,215      23,986
                                                  --------    --------

Deferred tax liabilities:
    Installment sale ..........................       --         6,271
    Accounts receivable retainage .............      3,866       6,973
    Property and equipment ....................      7,536       9,208
    Asset re-evaluations ......................      6,066       5,677
    All other .................................          5       3,420
                                                  --------    --------
Total deferred tax liabilities ................     17,473      31,549
    Valuation allowance .......................      1,376         211
                                                  --------    --------
Net deferred tax liability ....................   $ (7,634)   $ (7,774)
                                                  ========    ========

     The net deferred tax  liability  includes  deferred  items  resulting  from
acquisitions  made  during the  period  which are not  reflected  as part of the
deferred tax  provision.  Deferred tax assets of $1.2 million for 1997 have been
recorded  in  current  assets  in  the   accompanying   consolidated   financial
statements.  The net change in the  valuation  allowance for deferred tax assets
was a decrease of $1.2 million.

     A  reconciliation  of U.S.  statutory  federal  income  tax  expense on the
earnings from continuing operations is as follows:

                                                  l996       1997      1998
                                                 ------     ------    ------
     U.S. statutory federal rate
        applied to pretax income ............       35%        35%       35%
     State and local income taxes ...........        2          2        10
     Effect of non-U.S. tax rates ...........       (1)        (1)      (23)
     Amortization of intangibles ............       --         --        58
     Gain on sale of Spanish operations .....       --         --       329
     Non-deductible expenses ................       --         --        37
     Other ..................................        1          1        33
                                                 ======     ======    ======
     Provision for income taxes .............       37%        37%      479%
                                                 ======     ======    ======

     No provision  have been made for the years ended December 31, 1997 and 1998
for U.S. income taxes on the undistributed  earnings of the foreign subsidiaries
since  it is  MasTec's  intention  to  utilize  those  earnings  in the  foreign
operations  for an  indefinite  period of time.  During  1998,  MasTec  sold its
interest in its Spanish  operations  which  resulted in a tax  liability of $7.8
million. At December 31, 1998,  undistributed  earnings of the remaining foreign
subsidiaries  amounted  to  $11.8  million.  If the  earnings  of  such  foreign
subsidiaries were not indefinitely  reinvested, a deferred tax liability of $0.2
million would be required.

     The Internal Revenue Service (the "IRS") examined the tax returns for
the fiscal years ended April 30, 1989 through April 30, 1993.  During 1998,  the
IRS  concluded  its  examination  which  resulted in a payment of  approximately
$150,000. The IRS is currently reviewing the tax returns filed by MasTec for the
years ended  December 31, 1995 and 1996.  No  adjustments  have been proposed to
date related to this review.

                                       35
<PAGE>

Note 8  -  Capital Stock

     MasTec has authorized  100,000,000 shares of common stock, $0.10 par value.
At December 31, 1997 and 1998, approximately 28,056,000 and 27,382,000 shares of
common stock were issued,  27,580,000  and  27,382,000  shares were  outstanding
(adjusted  for the stock  split),  respectively,  and 476,000 and 0 were held in
treasury,  at cost (after giving effect to the stock split paid in the form of a
dividend  from  treasury  stock),  respectively.  At December 31, 1997 and 1998,
MasTec had 5,000,000 shares of authorized but unissued preferred stock.

Note 9  -  Operations by geographic areas and segments

     MasTec  derives  a  substantial  portion  of  its  revenue  from  providing
telecommunications   infrastructure   services  to  Telefonica,   BellSouth  and
Telebras.  For the year ended  December 31, 1996,  approximately  31% and 13% of
MasTec's  revenue  was  derived  from  services  performed  for  Telefonica  and
BellSouth,  respectively.  For the year ended  December 31, 1997,  approximately
27%, 13% and 11% of MasTec's  revenue was derived from  services  performed  for
Telefonica,  BellSouth and Telebras,  respectively.  For the year ended December
31,  1998,  approximately  19%, 7% and 8% of MasTec's  revenue was derived  from
services performed for Telefonica, BellSouth and Telebras, respectively. For the
year ended December 31, 1997,  revenue  generated from Telebras is included from
August 1, 1997 (See Note 2).  For the year  ended  December  31,  1998,  revenue
generated  from Telebras is included from January 1, 1998 through July 31, 1998,
subsequent  to that period  Telebras was  privatized  and divided into more than
eight  unaffiliated  companies owned by private investors.  Accounts  receivable
from MasTec's three largest  customers  approximated  $192.0 million at December
31, 1997.

     External Network Services. MasTec's principal domestic business consists of
external network services for telecommunications providers,  including incumbent
and  competitive   local  exchange   carriers,   cable   television   operators,
long-distance carriers and wireless communications  providers.  External network
services  consist  of all of the  services  necessary  to  design,  install  and
maintain the physical  facilities  used to provide  telecommunications  services
from the  provider's  central  office,  switching  center or cable headed to the
ultimate  consumer's  home or business.  These services  include the placing and
splicing of cable,  the excavation of trenches in which to place the cable,  the
placing  of  related  structures  such as poles,  anchors,  conduits,  manholes,
cabinets  and  closures,  the  placing of drop lines from the main  transmission
lines to the customer's  home or business,  and the  maintenance  and removal of
these facilities. MasTec has developed expertise in directional boring, a highly
specialized and  increasingly  common method of placing buried cable networks in
congested  urban  markets  without  digging a trench.  Services to many of these
customers are provided under exclusive master contracts with 2 to 3 year initial
terms expiring at various dates.

     MasTec  provides  a  full  range  of  external   network  services  to  its
telecommunications  company  customers,  although certain of MasTec's  customers
handle certain of these services in-house.  MasTec's customers  generally supply
materials such as cable,  conduit and telephone  equipment,  and MasTec provides
the expertise,  personnel, tools and equipment necessary to perform the required
installation and maintenance services.

     Internal  Network  Services.  MasTec  provides  design,   installation  and
maintenance of internal networks linking the customers'  voice,  video, data and
internet computer and communications networks at multiple locations. MasTec also
provides   systems   integration   services,   which   involve  the   selection,
configuration,   installation  and  maintenance  of  software,  hardware,  other
computing  and  communications  equipment  and cabling to provide an  integrated
computing and communications  system.  Internal network services is less capital
intensive than external  network  construction  but requires a more  technically
proficient  work  force.   MasTec  provides  these  services  to  its  customers
nationwide, primarily on the east and west coasts of the United States.

     Internal network services consist of designing,  installing and maintaining
local  area  networks  and wide  area  networks  linking  the  customers'  voice
communications  networks  at  multiple  locations  with  their  data  and  video
services.  This type of work is similar to external network  construction;  both
involve  the placing and  splicing  of copper,  coaxial and fiber optic  cables.
Inside wiring is less capital  intensive than external network  construction but
requires a more technically proficient work force. MasTec contracts with primary
contractors to provide  services under  subcontracts  that are similar to master
contracts  in the  external  network  business.  MasTec also  provides  internal
network  services on individual  projects that are awarded on a competitive  bid
basis or through individual negotiation.

                                       36
<PAGE>

     External Network Power.  MasTec provides external network services to power
companies,  including  investor-owned  utilities and rural  cooperatives.  These
services,  which are  substantially  similar to the  external  network  services
provided to  telecommunications  companies,  include  overhead  and  underground
construction and maintenance of electrical and other utilities  transmission and
distribution  networks,  substation  construction and maintenance,  right-of-way
maintenance  and  restoration of asphalt and concrete  surfaces.  The work often
involves  the  installation  and  splicing  of  high-voltage   transmission  and
distribution  lines.  Services to many of these  customers  are  provided  under
exclusive  master  contracts  with 2 to 3 year initial terms expiring at various
dates,  as well as on a project  by  project  basis  awarded  under  competitive
bidding and  individual  negotiations.  MasTec  currently has 42 master  service
agreements with power companies.

     The following  table set forth,  for each of 1996,  1997 and 1998,  certain
information   about  segment  results  of  operations  and  segment  assets  (in
thousands).
<TABLE>
<CAPTION>
           1996            External  Internal  External     
                           Network   Network   Network    Inter-
                           Services  Services   Power    national   Other(1) Consolidated
- -----------------------------------------------------------------------------------------
<S>                        <C>       <C>       <C>       <C>       <C>       <C>
Revenue ...............    $219,559    35,524     3,773   188,155    25,789  $  472,800
                           ========  ========  ========  ========  ========  ==========
Operating income (loss)      35,838     4,303       566    19,733   (10,498)     49,942
Depreciation and 
   amortization .......       8,718       484       522     2,058       218      12,000  
Total assets ..........     105,333    16,140     2,890   259,624    99,031     483,018
Capital Expenditures ..       3,714       689       320      --       2,336       7,059

           1997            External  Internal  External     
                           Network   Network   Network    Inter-
                           Services  Services   Power    national   Other(1) Consolidated
- -----------------------------------------------------------------------------------------

Revenue ...............    $281,426    47,285    19,693   282,393    28,642  $  659,439
                           ========  ========  ========  ========  ========  ==========
Operating income (loss)      39,888     3,565       607    21,450    (8,019)     57,483
Depreciation and 
   amortization .......      15,686     1,022     2,888     3,403       856      23,855
Total assets ..........     154,074    36,167    33,805   250,277   155,901     630,224
Capital Expenditures ..      16,387     1,113     1,223     1,879       932      21,534

           1998            External  Internal  External     
                           Network   Network   Network    Inter-
                           Services  Services   Power    national   Other(1) Consolidated
- -----------------------------------------------------------------------------------------

Revenue ...............    $455,798    89,687   120,218   379,294     3,925  $1,048,922
                           ========  ========  ========  ========  ========  ==========
Operating income (loss)      58,974    (3,411)   10,910    15,167   (53,380)     28,260
Depreciation and 
    amortization ......      24,600     1,617    10,095     6,029       972      43,313
Total assets ..........     303,088    60,659    86,809    88,612   196,318     735,486
Capital Expenditures ..      41,946     2,361    25,872     5,003     1,263      76,445
</TABLE>

     (1)  Consists of non-core construction and corporate operations.

                                       37
<PAGE>

     There are no significant  transfers between  geographic areas and segments.
Operating  income  consists of revenue  less  operating  expenses,  and does not
include  interest  expense,  interest  and other  income,  equity in earnings of
unconsolidated  companies,  minority interest and income taxes. Operating income
is net of corporate general and administrative  expenses. Total assets are those
assets used in MasTec's  operations in each segment.  Corporate  assets  include
cash and cash equivalents,  investments in unconsolidated companies, assets held
for sale and notes receivable.

Note 10  -  Commitments and Contingencies

     In  December  1990,  Albert H.  Kahn,  a  stockholder  of  MasTec,  filed a
purported  class  action and  derivative  suit in Delaware  state court  against
MasTec,  the  then-members  of its Board of  Directors,  and  National  Beverage
Corporation ("NBC"), MasTec's then-largest  stockholder.  The complaint alleges,
among other  things,  that MasTec's  Board of Directors  and NBC breached  their
respective fiduciary duties in approving certain transactions.

     In November 1993,  Mr. Kahn filed a class action and  derivative  complaint
against  MasTec,  the then members of its Board of Directors,  and Jorge L. Mas,
Jorge Mas and Juan Carlos Mas, the principal  shareholders  of MasTec.  The 1993
lawsuit  alleges,  among other things,  that MasTec's Board of Directors and NBC
breached  their  respective  fiduciary  duties  by  approving  the  terms of the
acquisition  of MasTec by the Mas family,  and that the Mas family had knowledge
of the  fiduciary  duties  owed by NBC  and  MasTec's  Board  of  Directors  and
knowingly and  substantially  participated  in the breach of these  duties.  The
lawsuit also claims derivatively that each member of MasTec's Board of Directors
engaged in  mismanagement,  waste and  breach of  fiduciary  duties in  managing
MasTec's affairs prior to the acquisition by the Mas Family.

     There has been no  activity  in either of these  lawsuits  in more than two
years.  MasTec believes that the allegations in each of the lawsuits are without
merit and intends to defend these lawsuits vigorously.

     In November 1997, Church & Tower filed a lawsuit against  Miami-Dade County
(the  "County") in Florida state court  alleging  breach of contract and seeking
damages  exceeding $3.0 million in connection  with the County's  refusal to pay
amounts  due to Church & Tower  under a  multi-year  agreement  to perform  road
restoration  work for the  Miami-Dade  Water and Sewer  Department  ("MWSD"),  a
department  of  the  County,  and  the  County's  wrongful  termination  of  the
agreement. The County has refused to pay amounts due to Church & Tower under the
agreement until alleged overpayments under the agreement have been resolved, and
has counterclaimed  against MasTec seeking damages.  The County also has refused
to award a new road restoration  agreement for MWSD to Church & Tower, which was
the low  bidder  for the new  agreement.  MasTec  is  vigorously  pursuing  this
lawsuit.

     MasTec is a party to other pending legal proceedings  arising in the normal
course of  business,  none of which  MasTec  believes  is  material  to MasTec's
financial position or results of operations.

     Federal,  state and local laws and regulations govern MasTec's operation of
underground fuel storage tanks. MasTec is in the process of removing,  restoring
and upgrading  these tanks,  as required by applicable  laws, and has identified
certain tanks and surrounding  soil which will require  remedial  cleanups.  The
cost of these cleanups is not expected to be material.

     In connection with certain contracts,  MasTec has signed certain agreements
of indemnity in the aggregate amount of approximately  $194.4 million,  of which
approximately  $145.3 million relate to the uncompleted  portion of contracts in
process.  These  agreements are to secure the  fulfillment  of  obligations  and
performance of the related contracts.

     During 1998,  MasTec  provided a customer  financing in connection with the
sale of its  services.  As of  December  31,  1998,  MasTec  had  $41.8  million
outstanding  under this agreement.  MasTec  anticipates  that it will provide an
additional $8.0 million of financing under this agreement. MasTec will terminate
financing  agreement as of April 30, 1999.  MasTec has entered into an agreement
to expand the telephone network of the Nicaraguan  telephone company.  MasTec is
not currently  rendering  construction  services in Nicaragua and has determined
not to proceed  with the project  unless  MasTec  obtains  non-recourse  outside
financing.

                                       38
<PAGE>

     MasTec has  committed to continue  developing  a PCS cellular  phone system
through its investment in Paraguay.  MasTec anticipates investing  approximately
$13.0 million for the development of this system over the next 12 months. MasTec
will terminate financing agreement as of April 30, 1999.

     MasTec announced a stock repurchase program in April 1998. Through December
31, 1998,  MasTec had purchased a total of 667,000 shares at an average price of
$20.58.  MasTec may  continue to purchase  shares from time to time.  The Credit
Facility  restricts  the amount of shares  that MasTec may  repurchase  up to an
additional amount of $5.5 million (see Note 5).

     MasTec's  current and future  operations and investments in certain foreign
countries  are generally  subject to the risks of political,  economic or social
instability, including the possibility of expropriation,  confiscatory taxation,
hyper-inflation  or other adverse  regulatory or  legislative  developments,  or
limitations on the repatriation of investment income,  capital and other assets.
MasTec  cannot  predict  whether any of such factors will occur in the future or
the  extent to which  such  factors  would  have a  material  adverse  effect on
MasTec's international operations.

Note 11  - Assets Held for Sale

     In previous years,  MasTec has recorded a charge of $23.1 million to adjust
the carrying  values of its real estate  investment to estimated net  realizable
value  based on offers  received  by MasTec to dispose of  certain  real  estate
investments  in a bulk  transaction.  Included  in  assets  held for sale in the
accompanying  balance  sheet is  approximately  $10.5  million of real estate at
December 31, 1998. MasTec is actively  marketing this real estate and expects to
dispose of substantially all these assets in 1999.

     MasTec  has  a  28%   voting   interest   in   Supercanal   Holding,   S.A.
("Supercanal"),  a  holding  company  of  numerous  cable  television  operators
predominately in Argentina.  MasTec does not exercise significant influence over
the management of Supercanal. During 1998, MasTec contributed an additional $1.7
million. Based on the most recent available financial information,  for the nine
months ended  September 30, 1998,  Supercanal  incurred  losses of $53.0 million
(unaudited)   and   reflected  a   shareholders'   deficiency  of  $5.0  million
(unaudited).

     In  July  1995,   MasTec  made  a  $25  million   non-recourse   term  loan
collateralized by 40% of the capital stock of a holding company that owned 52.6%
of the  capital  stock of  Consorcio  Ecuatoriano  de  Telecomunicaciones,  S.A.
("Conecel"),  one of two cellular phone operators in the Republic of Ecuador. In
June 1997,  MasTec converted its loan and accrued interest into the stock of the
holding  company.  In December  1997,  MasTec sold its investment in the holding
company for $20.0 million in cash and 7.5 million shares of Conecel common stock
valued at $25.0 million.  Accordingly,  MasTec recognized a gain of $4.4 million
net of tax based of the percent of cash received to the total transaction value.

     During January 1999,  MasTec engaged  investment  bankers to dispose of its
investments  in Supercanal  and Conecel which have a carrying  value at December
31, 1998 of $33.9 million. MasTec also has other international  investments with
a carrying value of $5.6 million recorded as assets held for sale as of December
31, 1998.  MasTec estimates that the carrying value of such assets held for sale
will be realized upon their ultimate disposition.

                                       39
<PAGE>

Note 12 -  Quarterly Information (Unaudited)

     The following table presents unaudited  quarterly operating results for the
two  years  ended  December  31,  1998.   MasTec  believes  that  all  necessary
adjustments have been included in the amounts stated below to present fairly the
quarterly  results  when read in  conjunction  with the  Consolidated  Financial
Statements  and Notes  thereto for the years ended  December  31, 1997 and 1998.
Results of operations for any particular quarter are not necessarily  indicative
of  results  of  operations  for a full year or  predictive  of future  periods.
Quarterly  results  have been  adjusted to reflect the  application  of purchase
accounting to acquisitions previously accounted for as pooling of interests (see
Note 1).
<TABLE>
<CAPTION>
                                             1997                                      1998
                                         Quarter Ended                             Quarter Ended
                             --------------------------------------------------------------------------------
                              Mar 31    Jun 30    Sep 30    Dec 31      Mar 31    Jun 30    Sep 30    Dec 31
                             --------  --------  --------  --------   ---------  --------  --------  --------
                                                   (in thousands, except per share data)
<S>                          <C>       <C>       <C>       <C>         <C>       <C>       <C>       <C>
Statement of Income Data
Revenue .................... $130,143  $141,499  $184,562  $203,235    $186,095  $246,106  $288,606  $328,115
Gross profit, excluding 
   depreciation and
   amortization ............   36,928    39,675    41,688    44,918      33,129    59,878  $ 70,093    82,710
Operating income (loss) ....   15,495    17,614    16,772     7,602     (13,599)   20,011    26,289    (4,441)
Net income (loss) ..........    9,287    10,826     8,498     6,053     (12,099)    9,395    13,413   (24,624)
Basic earnings (loss) per .. $   0.36  $   0.42  $   0.32  $   0.22    $  (0.44) $   0.34  $   0.49  $  (0.90)
   share
Diluted earnings (loss) .... $   0.36  $   0.41  $   0.31  $   0.22    $  (0.44) $   0.33  $   0.48  $  (0.90)
   per share
</TABLE>


     MasTec  believes  that the effects of inflation  have not had a significant
impact on its results of operations or financial condition.  MasTec's results of
operations  have  historically  been  seasonally  weaker in the first and fourth
quarters of the year and have produced  stronger results in the second and third
quarters.

     During the third quarter of 1997,  MasTec  commenced  operations in Brazil,
through its subsidiary MasTec Inepar.

     During the fourth  quarter of 1997,  MasTec sold at a gain of $4.4  million
net of taxes, a portion of Conecel.

         First quarter of 1998 was negatively affected by severe weather, a $4.0
million  related to charges  incurred  in North  American  operations  and $13.4
million of severance expenses related to MasTec's Spanish operations.

 
     During the fourth  quarter of 1998,  MasTec sold at a loss of $9.2  million
($17.0 million net of taxes) 87% of its Spanish operations.

     During  the  fourth  quarter  of  1998,  MasTec  recorded  a $33.8  million
compensation  charge for senior  management at certain  operating  subsidiaries,
$4.5 million for losses on a non-core  contract,  $1.4 million for startup costs
and $500,000 associated with bad debts reserves.



                             * * * * * * * * * * * *


                                       40
<PAGE>

                  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS
                     ON ACCOUNTING AND FINANCIAL DISCLOSURE

         None.

               DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     Information  regarding  MasTec's  executive  officers  is  included in this
Annual  Report  under  the  caption  "Executive  Officers  of  the  Registrant."
Information  regarding  MasTec's  directors and nominees for  directors  will be
contained in MasTec's  Proxy  statement  relating to the 1999 Annual  Meeting of
Shareholders  to be  held  on May  25,  1999  (the  "Proxy  Statement"),  and is
incorporated in this Annual Report by reference.

                             EXECUTIVE COMPENSATION

     Information  regarding  compensation of MasTec's executive officers will be
contained in the Proxy  Statement and is  incorporated  in this Annual Report by
reference,  except  the  Compensation  Committee  Report and  Performance  Graph
contained  in the Proxy  Statement,  which are not  incorporated  in this Annual
Report by reference.

         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     Information  regarding  the  ownership  of  MasTec's  Common  Stock will be
contained in the Proxy  Statement and is  incorporated  in this Annual Report by
reference.

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     Information  regarding certain  relationships and related transactions will
be contained in the Proxy Statement and is incorporated in this Annual Report by
reference.

         EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a)  1.   Financial  Statements - The financial statements and the reports of
          Independent Accountants are listed on page 18 and included on pages 19
          through 41.

     2.   Financial  Statements  Schedules - The  financial  statement  schedule
          information required by Item 14(a)(2) is included as part of "Note 3 -
          Accounts   Receivable"   of  the  Notes  to   Consolidated   Financial
          Statements.

     3.   Exhibits including those incorporated by reference:

Exhibit
   No.    Description

     1.1  Articles of Incorporation,  filed as Appendix B to MasTec's definitive
          Proxy  Statement  for its 1998 Annual  Meeting of  Stockholders  dated
          April 14, 1998 and filed with the Securities  and Exchange  Commission
          on April 14, 1998, and incorporated by reference herein.

     1.2  By-laws,  filed as Exhibit 3.2 to MasTec's Form 8-K dated May 29, 1998
          and filed with the  Commission on June 26, 1998, and  incorporated  by
          reference herein.

     4.1  7 3/4%  Senior  Subordinated  Notes  Due  2008  Indenture  dated as of
          February  4,  1998,  filed as  Exhibit  4.2 to  MasTec's  Registration
          Statement  on Form  S-4  (file  No.  333-46361)  and  incorporated  by
          reference herein.

                                       41
<PAGE>

     10.1 Stock Option  Agreement dated March 11, 1994 between MasTec and Arthur
          B. Laffer,  filed as Exhibit  10.6 to MasTec's  Form 10-K for the year
          ended December 31, 1995 and incorporated by reference herein.

     10.2 Stock Option  Agreement  dated  December  29, 1997 between  MasTec and
          Henry N. Adorno,  filed as Exhibit 10.2 to MasTec's  Form 10-K for the
          year ended December 31,1997 and incorporated by reference herein.

     10.3 Stock Option  Agreement  dated  December  29, 1997 between  MasTec and
          Joel-Tomas Citron, filed as Exhibit 10.3 to MasTec's Form 10-K for the
          year ended December 31, 1997 and incorporated by reference herein.

     10.4 Revolving  Credit  Agreement  dated as of June 9, 1997 between MasTec,
          certain  of its  subsidiaries,  and BankBoston,  N.A.  as agent.

     10.5 Agreement dated July 21, 1997 between MasTec and Inepar S/A Industrias
          e  Construcoes,  filed as Exhibit  10.5 to MasTec's  Form 10-K for the
          year ended December 31, 1997 and incorporated by reference herein.

     10.6 First Amendment to Revolving Credit  Agreement,  filed as Exhibit 10.1
          to MasTec's  Quarterly  Report on Form 10-Q for the quarter ended June
          30, 1998 and incorporated by reference herein.

     10.7 Second,  Third,  Fourth  and  Fifth  Amendments  to  Revolving  Credit
          Agreement.

     10.8 Agreement  between  Joel-Tomas  Citron and MasTec dated as of November
          18, 1998.

     10.9 Stock  purchase  and sale  agreement  dated as of  December  31,  1998
          between MasTec and a group of investors regarding the sale of MasTec's
          Spanish operations.

     21.1 Subsidiaries of MasTec.

     23.1 Consent of Arthur Andersen LLP

     23.2 Consent of PricewaterhouseCoopers LLP

     27.1 Financial Data Schedule

     99.1 Cautionary  Statements Regarding Safe Harbor Provisions of the Private
          Securities Litigation Reform Act of 1995

     (b)  Reports on Form 8-K:

          On January 14, 1999,  MasTec filed a Current  Report on Form 8-K dated
     December 31, 1998 with the  Securities  and Exchange  Commission  reporting
     information under Item 2, Acquisition or Disposition of Assets.

                                       42
<PAGE>




                                   SIGNATURES

     Pursuant  to the  requirements  of  Section  13 or 15(d) of the  Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned,  thereunto duly authorized, in the City of Miami,
State of Florida, on March 29, 1999.

                                  MASTEC, INC.

                                  /S/ CARMEN M. SABATER
                                  --------------------------------------------
                                  Carmen M. Sabater
                                  Senior Vice President - Director of Finance
                                  (Principal Financial Officer)

                                  /S/ ARLENE VARGAS
                                  --------------------------------------------
                                  Arlene Vargas
                                  Vice President and Controller
                                  (Principal Accounting Officer)


                                POWER OF ATTORNEY

     The undersigned  directors and officers of MasTec,  Inc. hereby  constitute
and appoint  Carmen M. Sabater and Jose Sariego and each of them with full power
to act without the other and with full power of substitution and resubstitution,
our true and lawful attorneys-in-fact with full power to execute in our name and
behalf in the capacities indicated below this Annual Report on Form 10-K and any
and all amendments  thereto and to file the same, with all exhibits  thereto and
other  documents  in  connection  therewith,  with the  Securities  and Exchange
Commission and hereby ratify and confirm all that such attorneys-in-fact, or any
of them, or their  substitutes  shall  lawfully do or cause to be done by virtue
hereof.

     Pursuant to the  requirements of the Securities  Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
Registrant and in the capacities indicated on March 29, 1999.


/S/ JORGE MAS
- --------------------------------------
Jorge Mas, Chairman of the Board,
President and Chief Executive Officer
(Principal Executive Officer)


/S/ ELIOT C. ABBOTT
- --------------------------------------
Eliot C. Abbott, Director


/S/ ARTHUR B. LAFFER
- --------------------------------------
Arthur B. Laffer, Director


/S/ JOSE S. SORZANO
- --------------------------------------
Jose S. Sorzano, Director


/S/ JOEL-TOMAS CITRON
- --------------------------------------
Joel-Tomas Citron, Director

                                       43
<PAGE>


                                  MasTec, Inc.
                                 Exhibit Index

Exhibit
   No.    Description

     1.1  Articles of Incorporation,  filed as Appendix B to MasTec's definitive
          Proxy  Statement  for its 1998 Annual  Meeting of  Stockholders  dated
          April 14, 1998 and filed with the Securities  and Exchange  Commission
          on April 14, 1998, and incorporated by reference herein.

     1.2  By-laws,  filed as Exhibit 3.2 to MasTec's Form 8-K dated May 29, 1998
          and filed with the  Commission on June 26, 1998, and  incorporated  by
          reference herein.

     4.1  7 3/4%  Senior  Subordinated  Notes  Due  2008  Indenture  dated as of
          February  4,  1998,  filed as  Exhibit  4.2 to  MasTec's  Registration
          Statement  on Form  S-4  (file  No.  333-46361)  and  incorporated  by
          reference herein.

     10.1 Stock Option  Agreement dated March 11, 1994 between MasTec and Arthur
          B. Laffer,  filed as Exhibit  10.6 to MasTec's  Form 10-K for the year
          ended December 31, 1995 and incorporated by reference herein.

     10.2 Stock Option  Agreement  dated  December  29, 1997 between  MasTec and
          Henry N. Adorno,  filed as Exhibit 10.2 to MasTec's  Form 10-K for the
          year ended December 31,1997 and incorporated by reference herein.

     10.3 Stock Option  Agreement  dated  December  29, 1997 between  MasTec and
          Joel-Tomas Citron, filed as Exhibit 10.3 to MasTec's Form 10-K for the
          year ended December 31, 1997 and incorporated by reference herein.

     10.4 Revolving  Credit  Agreement  dated as of June 9, 1997 between MasTec,
          certain  of its  subsidiaries,  and BankBoston,  N.A.  as agent.

     10.5 Agreement dated July 21, 1997 between MasTec and Inepar S/A Industrias
          e  Construcoes,  filed as Exhibit  10.5 to MasTec's  Form 10-K for the
          year ended December 31, 1997 and incorporated by reference herein.

     10.6 First Amendment to Revolving Credit  Agreement,  filed as Exhibit 10.1
          to MasTec's  Quarterly  Report on Form 10-Q for the quarter ended June
          30, 1998 and incorporated by reference herein.

     10.7 Second,  Third,  Fourth  and  Fifth  Amendments  to  Revolving  Credit
          Agreement.

     10.8 Agreement  between  Joel-Tomas  Citron and MasTec dated as of November
          18, 1998.

     10.9 Stock  purchase  and sale  agreement  dated as of  December  31,  1998
          between MasTec and a group of investors regarding the sale of MasTec's
          Spanish operations.

     21.1 Subsidiaries of MasTec.

     23.1 Consent of Arthur Andersen LLP

     23.2 Consent of PricewaterhouseCoopers LLP

     27.1 Financial Data Schedule

     99.1 Cautionary  Statements Regarding Safe Harbor Provisions of the Private
          Securities Litigation Reform Act of 1995





                                  Exhibit 10.4

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

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

                           REVOLVING CREDIT AGREEMENT


                            Dated as of June 9, 1997

                                  by and among

                                  MASTEC, INC.
- --------------------------------------------------------------------------------
                                 (the "Parent")
- --------------------------------------------------------------------------------
             and its Subsidiaries (other than Excluded Subsidiaries
                 and members of the MasTec International Group)
                           listed on Schedule 1 hereto
                         (collectively, the "Borrowers")
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                                       and

                                BANKBOSTON, N.A.
                                     ("BKB")

                                       and

                        CREDITANSTALT-BANKVEREIN ("CB"),
              FIRST UNION NATIONAL BANK OF FLORIDA ("First Union"),
                    THE SUMITOMO BANK, LIMITED ("Sumitomo"),
                            SCOTIABANC INC. ("SBI"),
                    THE FUJI BANK AND TRUST COMPANY ("Fuji"),
                           COMERICA BANK ("Comerica"),
                         and LTCB TRUST COMPANY ("LTCB")
                           (collectively, the "Banks")

                                       and

                           BANKBOSTON, N.A., as Agent




<PAGE>


                                      -iv-
                                                                           
ss.1.  DEFINITIONS AND RULES OF INTERPRETATION.................................1
       ss.1.1.  Definitions.  .................................................1
       ss.1.2.  Rules of Interpretation.......................................16
ss.2.  THE REVOLVING CREDIT FACILITY..........................................17
       ss.2.1.  Commitment to Lend.  .........................................17
       ss.2.2.  Reduction of Total Commitment.  ..............................17
       ss.2.3.  The Revolving Credit Notes; the Swing Line Note.  ............18
       ss.2.4.  Interest on Loans.  ..........................................18
       ss.2.5.  Election of LIBOR Rate; Notice of Election; Interest 
                  Periods; Minimum Amounts....................................19
       ss.2.6.  Requests for Revolving Credit Loans.  ........................20
       ss.2.7.  Funds for Revolving Credit Loans.  ...........................21
       ss.2.8.  Maturity of the Loans; Annual Option to Extend.  .............22
       ss.2.9.  Mandatory Repayments of the Loans.  ..........................23
       ss.2.10. Optional Prepayments or Repayments of Loans.  ................23
       ss.2.11. Swing Line Loans; Settlements.................................23
ss.3.  LETTERS OF CREDIT......................................................26
       ss.3.1.  Letter of Credit Commitments..................................26
       ss.3.2.  Reimbursement Obligation of the Borrowers.  ..................27
       ss.3.3.  Obligations Absolute.  .......................................27
       ss.3.4.  Reliance by Agent.  ..........................................28
ss.4.  FEES, PAYMENTS, AND COMPUTATIONS; JOINT AND
         SEVERAL LIABILITY....................................................28
       ss.4.1.  Fees..........................................................28
       ss.4.2.  Payments......................................................29
       ss.4.3.  Computations.  ...............................................30
       ss.4.4.  Additional Costs, Etc.  ......................................31
       ss.4.5.  Capital Adequacy.  ...........................................32
       ss.4.6.  Certificate.  ................................................33
       ss.4.7.  Reasonable Efforts to Mitigate.  .............................33
       ss.4.8.  LIBOR Indemnity.  ............................................33
       ss.4.9.  Interest on Overdue Amounts.  ................................34
       ss.4.10. Interest Limitation.  ........................................34
       ss.4.11. Illegality; Inability to Determine LIBOR Rate.  ..............35
       ss.4.12. Concerning Joint and Several Liability of the
                  Borrowers...................................................35
       ss.4.13. New Borrowers.  ..............................................38
       ss.4.14. Replacement of Banks.  .......................................38
ss.5.  REPRESENTATIONS AND WARRANTIES.  ......................................39
       ss.5.1.  Corporate Authority...........................................39
       ss.5.2.  Governmental Approvals.  .....................................40
       ss.5.3.  Title to Properties; Leases  .................................41
       ss.5.4.  Financial Statements; Solvency................................41
       ss.5.5.  No Material Changes, Etc.  ...................................42
       ss.5.6.  Permits, Franchises, Patents, Copyrights, Etc.  ..............42
       ss.5.7.  Litigation.  .................................................42
       ss.5.8.  No Materially Adverse Contracts, Etc.  .......................42
       ss.5.9.  Compliance With Other Instruments, Laws, Etc.  ...............43
       ss.5.10. Tax Status.  .................................................43
       ss.5.11. No Event of Default.  ........................................43
       ss.5.12. Holding Company and Investment Company Acts.  ................43
       ss.5.13. Absence of Financing Statements, Etc.  .......................44
       ss.5.14. Employee Benefit Plans........................................44
       ss.5.15. Use of Proceeds.  ............................................45
       ss.5.16. Environmental Compliance.  ...................................45
       ss.5.17. Perfection of Security Interests.  ...........................47
       ss.5.18. Certain Transactions.  .......................................47
       ss.5.19. Subsidiaries.  ...............................................48
       ss.5.20. True Copies of Charter and Other Documents.  .................48
ss.6.  AFFIRMATIVE COVENANTS OF THE BORROWERS.  ..............................48
       ss.6.1.  Punctual Payment.  ...........................................48
       ss.6.2.  Maintenance of Office.  ......................................48
       ss.6.3.  Records and Accounts.  .......................................49
       ss.6.4.  Financial Statements, Certificates and Information.  .........49
       ss.6.5.  Corporate Existence and Conduct of Business.  ................51
       ss.6.6.  Maintenance of Properties.  ..................................51
       ss.6.7.  Insurance.  ..................................................52
       ss.6.8.  Taxes.  ......................................................52
       ss.6.9.  Inspection of Properties, Books, and Contracts.  .............53
       ss.6.10. Compliance with Laws, Contracts, Licenses and Permits;
                   Maintenance of Material Licenses and Permits.  ............53
       ss.6.11. ENVIRONMENTAL INDEMNIFICATION.  ..............................53
       ss.6.12. Further Assurances.  .........................................54
       ss.6.13. Notice of Potential Claims or Litigation.  ...................54
       ss.6.14. Notice of Default.  ..........................................54
ss.7.  CERTAIN NEGATIVE COVENANTS OF THE BORROWERS.  .........................54
       ss.7.1.  Restrictions on Funded Debt.  ................................55
       ss.7.2.  Restrictions on Liens.  ......................................55
       ss.7.3.  Restrictions on Investments.  ................................57
       ss.7.4.  Mergers, Consolidations, Sales.  .............................58
       ss.7.5.  Sale and Leaseback.  .........................................59
       ss.7.6.  Restricted Distributions and Redemptions.  ...................60
       ss.7.7.  Employee Benefit Plans.  .....................................60
       ss.7.8.  Negative Pledges.  ...........................................61
       ss.7.9.  Pledges of Stock of the Sintel Group.  .......................61
       ss.7.10. Newly-Created Subsidiaries.  .................................61
ss.8.  FINANCIAL COVENANTS OF THE BORROWERS.  ................................61
       ss.8.1.  Leverage Ratios.  ............................................61
       ss.8.2.  Capital Expenditures.  .......................................62
       ss.8.3.  Interest Coverage Ratio.  ....................................62
       ss.8.4.  Liquidity.  ..................................................62
       ss.8.5.  Profitable Operations.  ......................................62
ss.9.  CLOSING CONDITIONS.  ..................................................62
       ss.9.1.  Corporate Action.  ...........................................62
       ss.9.2.  Loan Documents, Etc.  ........................................62
       ss.9.3.  Certified Copies of Charter Documents.  ......................62
       ss.9.4.  Incumbency Certificate.  .....................................63
       ss.9.5.  Validity of Liens.  ..........................................63
       ss.9.6.  UCC Search Results.  .........................................63
       ss.9.7.  Certificates of Insurance.  ..................................63
       ss.9.8.  Opinion of Counsel.  .........................................63
       ss.9.9.  Certificate of Financial Condition.  .........................64
       ss.9.10. Initial Compliance Certificate.  .............................64
       ss.9.11. Interim Balance Sheets and Income Statements.  ...............64
       ss.9.12. Payoff Letters.  .............................................64
ss.10. CONDITIONS OF ALL LOANS.  .............................................65
       ss.10.1.  Representations True; No Event of Default.  .................65
       ss.10.2.  Performance; No Event of Default.  ..........................65
       ss.10.3.  No Legal Impediment.  .......................................65
       ss.10.4.  Governmental Regulation.  ...................................65
       ss.10.5.  Proceedings and Documents.  .................................66
ss.11. COLLATERAL SECURITY.  .................................................66
ss.12. EVENTS OF DEFAULT; ACCELERATION; TERMINATION
         OF COMMITMENT.  .....................................................66
       ss.12.1.  Events of Default and Acceleration.  ........................66
       ss.12.2.  Termination of Commitments.  ................................69
       ss.12.3.  Remedies.  ..................................................70
ss.13. SETOFF.  ..............................................................70
ss.14.  THE AGENT.  ..........................................................71
       ss.14.1.  Appointment of Agent, Powers and Immunities.  ...............71
       ss.14.2.  Actions By Agent.  ..........................................72
       ss.14.3.  INDEMNIFICATION.  ...........................................72
       ss.14.4.  Reimbursement.  .............................................73
       ss.14.5.  Documents.  .................................................73
       ss.14.6.  Non-Reliance on Agent and Other Banks.  .....................74
       ss.14.7.  Resignation of Agent.  ......................................74
       ss.14.8.  Action by the Banks, Consents, Amendments, Waivers,
                   Etc.  .....................................................75
ss.15. EXPENSES.  ............................................................75
ss.16. SURVIVAL OF COVENANTS, ETC.  ..........................................76
ss.17. ASSIGNMENT AND PARTICIPATION.  ........................................77
ss.18. PARTIES IN INTEREST.  .................................................78
ss.19. NOTICES, ETC.  ........................................................78
       ss.19.1.  Notices.  ...................................................78
       ss.19.2.  Deemed Notice.  .............................................79
ss.20. MISCELLANEOUS.  .......................................................79
ss.21. ENTIRE AGREEMENT, ETC.  ...............................................79
ss.22. WAIVER OF JURY TRIAL.  ................................................80
ss.23. GOVERNING LAW.  .......................................................80
ss.24. SEVERABILITY.  ........................................................81


                              Schedules & Exhibits

         Exhibit A                  Form of Revolving Credit Note
         Exhibit B                  Swing Line Note
         Exhibit C                  Form of Loan and Letter of Credit Request
         Exhibit D                  Form of Compliance Certificate
         Exhibit E                  Form of Assignment and Acceptance

         Schedule 1                 Subsidiaries of the Parent
         Schedule 5.7               Litigation
         Schedule 5.10              Taxes
         Schedule 5.14(b)           Employee Benefit Plans
         Schedule 5.16              Environmental Matters
         Schedule 5.17              Claims on Collateral
         Schedule 5.18              Certain Transactions
         Schedule 6.7               Insurance
         Schedule 7.1(c)            Existing Funded Debt
         Schedule 7.2(g)            Existing Liens
         Schedule 7.4               Permitted Dispositions
         Schedule 9.11              Interim Balance Sheets and Income Statements


<PAGE>


                                       


                           REVOLVING CREDIT AGREEMENT


     This  REVOLVING   CREDIT  AGREEMENT  is  made  as  of  June  9,  1997  (the
"Agreement"),  by and  among (a)  MASTEC,  INC.,  a  Delaware  corporation  (the
"Parent"), its Subsidiaries (other than the Excluded Subsidiaries and members of
the MasTec  International  Group) listed on Schedule 1 hereto (collectively with
the Parent, the "Borrowers"),  (b) BANKBOSTON,  N.A. ("BKB"), a national banking
association  having its  principal  place of  business  at 100  Federal  Street,
Boston,  Massachusetts  02110,   CREDITANSTALT-BANKVEREIN  ("CB"),  an  Austrian
banking  corporation  having  an  office  at  Two  Greenwich  Plaza,  Greenwich,
Connecticut  06830,  FIRST UNION  NATIONAL BANK OF FLORIDA  ("First  Union"),  a
national banking association having its principal place of business at 200 South
Biscayne Boulevard, 15th Floor, Miami, Florida 33131, THE SUMITOMO BANK, LIMITED
("Sumitomo"),  a Japanese banking  association  having an office at One Biscayne
Tower, 2 South Biscayne Boulevard,  Suite 3300, Miami, Florida 33131, SCOTIABANC
INC. ("SBI"),  a wholly-owned  subsidiary of The Bank of Nova Scotia, a Canadian
chartered bank,  having its principal place of business at 600 Peachtree Street,
N.E.,  Suite  2700,  Atlanta,  Georgia  30308,  THE FUJI BANK AND TRUST  COMPANY
("Fuji"),  a New York corporation  having its principal place of business at Two
World Trade Center,  New York,  New York 10048,  COMERICA BANK  ("Comerica"),  a
Michigan  banking  corporation  having its  principal  place of  business at 500
Woodward  Avenue,  9th Floor,  Detroit,  Michigan 48226,  and LTCB TRUST COMPANY
("LTCB"),  a wholly-owned U.S. subsidiary of the Long-Term Credit Bank of Japan,
Ltd. having its principal place of business at 165 Broadway,  New York, New York
10006,  and the other lending  institutions  which become parties hereto (each a
"Bank" and, collectively,  the "Banks"), and (c) BANKBOSTON,  N.A., as agent for
the Banks (the "Agent").

     ss.1. DEFINITIONS AND RULES OF INTERPRETATION.

     ss.1.1. Definitions.  

     The  following  terms  shall  have the  meanings  set forth in this ss.1 or
elsewhere in the provisions of this Agreement referred to below:

     Accounts Receivable. All rights of the Borrowers to payment for goods sold,
leased or otherwise  marketed in the ordinary  course of business and all rights

<PAGE>
                                      -2-


of the  Borrowers  to payment for services  rendered in the  ordinary  course of
business  and all sums of  money  or other  proceeds  due  thereon  pursuant  to
transactions  with account debtors,  except for that portion of the sum of money
or other  proceeds  due thereon that relate to sales,  use or property  taxes in
conjunction with such  transactions,  recorded on books of account in accordance
with GAAP.

     Accountants. See ss.6.4(c).

     Agent. BKB acting as agent for the Banks.

     Agent's  Head  Office.  The  Agent's  head office is located at 100 Federal
Street, Boston,  Massachusetts 02110, or at such other location as the Agent may
designate from time to time.

     Agent's Special Counsel. Bingham, Dana & Gould LLP or such other counsel as
may be  approved  by the Agent.  Agreement.  This  Revolving  Credit  Agreement,
including the Schedules and Exhibits hereto.

     Applicable  Commitment Rate. The Applicable Commitment Rate shall be as set
forth in the Pricing  Table.  The effective  date of a change in the  Applicable
Commitment  Rate shall be the first day after  receipt by the Banks of financial
statements delivered pursuant to ss.6.4(a) or (b) hereof which indicate a change
in the Pricing  Ratio.  If at any time the financial  statements  required to be
delivered  pursuant to ss.6.4(a) or (b) hereof are not delivered within the time
periods specified in such subsections,  the Applicable  Commitment Rate shall be
0.375%, subject to adjustment upon actual receipt of such financial statements.

     Applicable Laws. See ss.6.10.

     Applicable  LIBOR Margin.  The Applicable LIBOR Margin on LIBOR Loans shall
be as set forth in the Pricing Table.  Any change in the Applicable LIBOR Margin
shall  become  effective on the first day of each  Interest  Period which begins
three (3) or more  days  after  receipt  by the  Banks of  financial  statements
delivered  pursuant to ss.6.4(a)  or (b) hereof  which  indicate a change in the
Pricing Ratio. If at any time the financial  statements required to be delivered
pursuant to  ss.6.4(a) or (b) hereof are not  delivered  within the time periods
specified in such  subsections,  the Applicable LIBOR Margin shall be 1.50% with
respect to any LIBOR Loan requested on or after the date on which such financial
statements  were required to be delivered but before the time of actual  receipt
of such financial statements,  subject to adjustment upon actual receipt of such
financial statements.
<PAGE>
                                      -3-


     Applicable L/C Margin. The Applicable L/C Margin on Letters of Credit shall
be as set forth in the  Pricing  Table.  The  effective  date of a change in the
Applicable  L/C  Margin  shall be the first day  after  receipt  by the Banks of
financial  statements  delivered  pursuant  to  ss.6.4(a)  or (b)  hereof  which
indicate a change in the Pricing Ratio. If at any time the financial  statements
required to be delivered  pursuant to ss.6.4(a) or (b) hereof are not  delivered
within the time periods specified in such subsections, the Applicable L/C Margin
shall be 1.50% with  respect to any  Letter of Credit  issued  after the date on
which such financial  statements were required to be delivered but before actual
receipt of such financial statements,  subject to adjustment upon actual receipt
of such financial statements.

     Applicable  Swing Line Rate.  The annual rate of interest  agreed upon from
time to time by BKB and the Borrowers with respect to Swing Line Loans.

     Balance Sheet Date. December 31, 1996.

     Bankruptcy  Event.  Any  event of the  types  described  in  ss.ss.12.1(h),
12.1(i).

     Base Rate.  The higher of (a) the annual  rate of interest  announced  from
time to time by the Agent at its head  office in  Boston,  Massachusetts  as its
"base  rate" (it being  understood  that such rate is a  reference  rate and not
necessarily the lowest rate of interest charged by the Agent) or (b) one percent
(1%) above the overnight federal funds effective rate, as published by the Board
of Governors of the Federal Reserve System, as in effect from time to time.

     Base Rate Loans. Loans bearing interest calculated by reference to the Base
Rate.

     BKB. BankBoston, N.A.

     Borrowers. See preamble.

     Business   Day.  Any  day  on  which   banking   institutions   in  Boston,
Massachusetts are open for the transaction of banking business.
<PAGE>
                                    
                                       -4-


     Capital  Assets.  Fixed  assets,  both tangible  (such as land,  buildings,
fixtures,  machinery and equipment) and intangible (such as patents, copyrights,
trademarks,  franchises  and good will);  provided that Capital Assets shall not
include (a) any item customarily charged directly to expense or depreciated over
a useful  life of  twelve  (12)  months  or less in  accordance  with  generally
accepted accounting principles,  or (b) any item obtained through an acquisition
permitted by ss.7.4 hereof.

     Capital  Expenditures.   Amounts  paid  or  indebtedness  incurred  by  the
Borrowers in  connection  with the purchase or lease by the Borrowers of Capital
Assets that would be required to be  capitalized  and shown on the balance sheet
of such Person in accordance with GAAP.

     Capitalized   Leases.   Leases,   the  discounted   future  rental  payment
obligations  under which are required to be  capitalized on the balance sheet of
the lessee or obligor in accordance with GAAP.

     CERCLA. See definition of Release.

     certified.  With respect to the financial  statements  of any Person,  such
statements as audited by a firm of independent auditors,  whose report expresses
the opinion,  without  qualification,  that such  financial  statements  present
fairly the financial position of such Person.

     CFO. See ss.6.4(a).

     CLEC. Any  competitive  (non-monopoly)  local exchange  carrier,  as "local
exchange carrier" is defined in 47 U.S.C. ss.153.

     Closing Date. The date on which the conditions  precedent set forth in ss.9
are satisfied, as specified in a notice from the Agent.

     Code. The Internal Revenue Code of 1986, as amended and in effect from time
to time.

     Collateral. The shares of all direct or indirect Subsidiaries of the Parent
that are or are intended to be subject to the security  interests created by the
Stock Pledge Agreements.

     Commitment. With respect to each Bank, the amount determined by multiplying
such Bank's  Commitment  Percentage by the Total Commitment  specified in ss.2.1
hereof, as the same may be reduced from time to time.
<PAGE>
                                      -5-


     Commitment Fee. See ss.4.1.

     Commitment Percentage.  With respect to each Bank, the percentage set forth
beside its name below (subject to adjustment  upon any  assignments  pursuant to
ss.17):

                         Bank                            Percentage

                         BKB                              17.6000%
                         CB                               10.4000%
                         First Union                      13.6000%
                         Sumitomo                         10.4000%
                         SBI                              10.4000%
                         Fuji                             10.4000%
                         Comerica                         13.6000%
                         LTCB                             13.6000%

     Compliance Certificate. See ss.6.4(e).

     Consolidated  or  consolidated.  With reference to any term defined herein,
shall mean that term as applied to the accounts of the  Borrowers or the Parent,
as applicable, consolidated in accordance with GAAP.

     Consolidated  Earnings  Before  Interest and Taxes or EBIT. For any period,
the  Consolidated  Net  Income  (or  Deficit)  of the  Borrowers  determined  in
accordance  with GAAP,  plus (a) interest  expense and (b) income taxes,  to the
extent  that each was  deducted  in  determining  Consolidated  Net  Income  (or
Deficit).

     Consolidated Earnings Before Interest, Taxes, Depreciation and Amortization
or  EBITDA.  For  any  period,  EBIT  plus  (a)  depreciation  expense,  and (b)
amortization  expense,  to the extent such expenses were deducted in determining
Consolidated Net Income (or Deficit), provided that, for purposes of calculating
the financial  covenants  pursuant to ss.8.1 hereof,  but not the Pricing Ratio,
EBITDA  shall be  adjusted  to  include  earnings  plus  interest,  income  tax,
depreciation  and amortization  expenses of Borrowers  acquired during the prior
twelve months as if acquired on the first day of such period, provided that such
adjustments  shall not constitute more than 30% of EBITDA (as so adjusted),  and
furthermore  that  no  more  than  15% of  EBITDA  (as  so  adjusted)  shall  be
attributable to such acquired  Borrowers whose most recent financial  statements
have not been audited by an independent accounting firm reasonably  satisfactory
to the Agent.

     Consolidated  Net  Income (or  Deficit).  The  consolidated  net income (or
deficit) of the  Borrowers  after  deduction of all expenses,  taxes,  and other
proper  charges,   determined  in  accordance  with  GAAP  but  excluding,   (a)
extraordinary  income and  expenses,  and (b) income or  expenses  derived  from
non-Borrowers.

     Consolidated  Total  Interest  Expense.  For any period,  the  consolidated
interest  expense  required to be paid or accrued by the  Borrowers  during such
period on all Funded Debt of the Borrowers outstanding during all or any part of
such period, including capitalized interest expense for such period.

     Consolidated Total Liabilities. All liabilities of the Borrowers determined
on a consolidated basis in accordance with GAAP.

     Default. See ss.12.

     Disposal (or Disposed). See definition of Release.

     Distribution. The declaration or payment of any dividend or distribution on
or in  respect  of any shares of any class of  capital  stock,  any  partnership
interests or any  membership  interests of any Person,  other than  dividends or
other  distributions  payable  solely in shares  of common or  preferred  stock,
partnership  interests or membership  units of such Person,  as the case may be;
the  purchase,  redemption,  or other  retirement  of any shares of any class of
capital  stock,  partnership  interests  or  membership  units  of such  Person,
directly or indirectly  through a Subsidiary or otherwise;  the return of equity
capital by any Person to its  shareholders,  partners or members as such; or any
other distribution on or in respect of any shares of any class of capital stock,
partnership interest or membership unit of such Person.

     Dollars or $. Dollars in lawful currency of the United States of America.
        
     Drawdown Date. The date on which any Loan is made or is to be made, and the
date on which any Loan is converted or continued in accordance with ss.2.5.

     EBIT. See definition of Consolidated Earnings Before Interest and Taxes.

     EBITDA.  See definition of Consolidated  Earnings Before  Interest,  Taxes,
Depreciation and Amortization.

     Eligible  Foreign Bank. (a) Any commercial bank organized under the laws of
any other country which is a member of the Organization for Economic Cooperation
and Development  (the "OECD"),  or a political  subdivision of any such country,
provided  that  such bank is acting  through a branch or agency  located  in the
country in which it is  organized or another  country  which is also a member of
the OECD; or (b) the central bank of any country which is a member of the OECD.

     Employee  Benefit  Plan.  Any  employee  benefit plan within the meaning of
ss.3(3) of ERISA  maintained or  contributed  to by any  Borrower,  other than a
Guaranteed Pension Plan or a Multiemployer Plan.

     Environmental Laws. See ss.5.16(a).

     EPA. See ss.5.16(b).

     ERISA. The Employee  Retirement Income Security Act of 1974, as amended and
in effect from time to time.

     ERISA Affiliate.  Any Person which is treated as a single employer with any
Borrower under ss.414 of the Code.

     ERISA  Reportable  Event.  A reportable  event with respect to a Guaranteed
Pension  Plan  within  the  meaning  of  ss.4043  of ERISA  and the  regulations
promulgated  thereunder  as to which  the  requirement  of  notice  has not been
waived.

     Event of Default. See ss.12.

     Excluded  Subsidiaries.  The U.S.  Subsidiaries  of the Parent  (other than
members of the MasTec  International  Group) listed as Excluded  Subsidiaries on
Schedule 1 hereto,  and any other U.S.  Subsidiaries  of the Parent  acquired or
created  after the date  hereof  which  are not  required  to  become  Borrowers
pursuant to ss.4.13 hereof.

     Extension Date. March 31, 1999 and, thereafter, March 31, 2000.

     Fleet Credit  Agreement.  The Loan and Security  Agreement among certain of
the  Borrowers  and Fleet  Financial  Corporation  dated  January 26,  1995,  as
amended.

     Funded Debt.  Collectively,  without  duplication,  whether  classified  as
indebtedness,  an Investment or otherwise on the Borrowers' consolidated balance
sheet   (excluding  that  portion  of  assets  and  liabilities  of  the  Parent
attributable to non-Borrowers),  (a) all indebtedness for borrowed money, direct
or indirect, (b) all obligations evidenced by notes, bonds,  debentures or other
similar debt instruments  (including any unpaid  reimbursement  obligations with
respect to letters of credit), (c) all obligations, liabilities and indebtedness
under  Capitalized  Leases which correspond to principal,  and (d) Guarantees of
the Funded Debt of others referred to in clauses (a) through (c) above.

     generally  accepted  accounting  principles or GAAP. (i) When used in ss.8,
whether  directly or indirectly  through  reference to a  capitalized  term used
therein,   means  (A)  principles   that  are  consistent  with  the  principles
promulgated  or  adopted by the  Financial  Accounting  Standards  Board and its
predecessors, in effect for the fiscal year ended on the Balance Sheet Date, and
(B) to the extent  consistent with such principles,  the accounting  practice of
the Borrowers  reflected in its financial  statements  for the year ended on the
Balance Sheet Date, and (ii) when used in general, other than as provided above,
means  principles  that are (A) consistent  with the  principles  promulgated or
adopted by the Financial Accounting Standards Board and its predecessors,  as in
effect  from time to time,  and (B)  consistently  applied  with past  financial
statements of the Borrowers adopting the same principles,  provided that in each
case  referred  to  in  this  definition  of  "generally   accepted   accounting
principles"  a certified  public  accountant  would,  insofar as the use of such
accounting  principles is pertinent,  be in a position to deliver an unqualified
opinion  (other than a  qualification  regarding  changes in generally  accepted
accounting  principles) as to financial statements in which such principles have
been properly applied.

     Guarantee. Any obligation, contingent or otherwise, of a Person directly or
indirectly  guaranteeing  any  indebtedness  of any other  Person  and,  without
limiting the generality of the foregoing,  any  obligation,  direct or indirect,
contingent or otherwise,  of such Person,  (i) to purchase or pay (or advance or
supply funds for the purchase or payment of) such indebtedness  (whether arising
by virtue of partnership  arrangements,  by agreement to keep-well,  to purchase
assets, goods, securities or services, to take-or-pay,  or to maintain financial
statement  conditions  or  otherwise)  or (ii)  entered  into for the purpose of
assuring  in any other  manner the holder of such  indebtedness  of the  payment
thereof or to protect such holder  against loss in respect  thereof (in whole or
in part),  provided that the term Guarantee shall not include  endorsements  for
collection or deposit in the ordinary course of business.  The term  "Guarantee"
used as a verb has a corresponding meaning.

     Guaranteed  Pension  Plan.  Any  employee  pension  benefit plan within the
meaning of ss.3(2) of ERISA  maintained or contributed to by any Borrower or any
ERISA Affiliate,  the benefits of which are guaranteed on termination in full or
in part by the PBGC  pursuant to Title IV of ERISA,  other than a  Multiemployer
Plan.

     Hazardous Substances. See ss.5.16(b).

     Income Taxes. See ss.4.4.

     Interest Period. With respect to each LIBOR Loan:

     (a)  initially,  the period  commencing on the date of a conversion  from a
Base Rate Loan into a LIBOR Loan or the making of a LIBOR  Loan,  and ending one
(1), two (2),  three (3), or six (6) months  thereafter,  as the case may be, as
the Borrowers may select; and

     (b) thereafter, each subsequent Interest Period shall begin on the last day
of the preceding Interest Period and end one (1), two (2), three (3), or six (6)
months thereafter, as the case may be, as the Borrowers may select;

     (c) provided  that any Interest  Period which would  otherwise end on a day
which is not a LIBOR  Business  Day  shall be  deemed  to end on the next  LIBOR
Business Day; provided further that if such next LIBOR Business Day falls in the
next succeeding  calendar month,  such Interest Period shall be deemed to end on
the preceding  LIBOR Business Day; and provided  further that no Interest Period
shall extend beyond the Maturity Date.

     Interim Balance Sheet Date. March 31, 1997.

     International Signatories. MasTec International, Inc. and Sintel.

     Investments.   All   expenditures   made  and  all  Funded  Debt   incurred
(contingently or otherwise) (a) for the acquisition of stock or indebtedness of,
or (b) for loans,  advances,  capital contributions or transfers of property to,
or (c) in  respect  of any  Guarantees  on  behalf  of, or (d) with  respect  to
obligations of, any Person.  In determining the aggregate  amount of Investments
outstanding at any particular time: (a) the amount of any Investment represented
by a  Guarantee  shall be taken at not less  than the  principal  amount  of the
obligations guaranteed and still outstanding;  (b) there shall be included as an
Investment  all interest  accrued with  respect to Funded Debt  constituting  an
Investment  unless and until such interest is paid;  (c) there shall be deducted
in respect of each such  Investment  any amount  received as a return of capital
(including,   without  limitation,   by  repurchase,   redemption,   retirement,
repayment,  liquidating dividend or liquidating  distribution);  (d) there shall
not be deducted in respect of any Investment any amounts received as earnings on
such  Investment,  whether as  dividends,  interest  or  otherwise,  except that
accrued  interest  included  as  provided  in the  foregoing  clause  (b) may be
deducted  when paid;  and (e) there  shall not be  deducted  from the  aggregate
amount of Investments any decrease in the value thereof.

     Letter of Credit  Applications.  Letter of Credit Applications in such form
as may be agreed upon by any  Borrower and the Agent from time to time which are
entered into pursuant to ss.3 hereof as such Letter of Credit  Applications  are
amended, varied or supplemented from time to time.

     Letter of Credit Fee. See ss.4.1(b).

     Letter of Credit Participation. See ss.3.1(b).

     Letters of Credit.  Standby Letters of Credit issued or to be issued by the
Agent under ss.3 hereof for the account of the Borrowers.

     Leverage  Ratios.  The ratios of Senior  Debt to EBITDA and Funded  Debt to
EBITDA as set forth in ss.8.1.

     LIBOR Business Day. Any Business Day on which dealings in foreign  currency
and exchange are carried on among banks in London, England.

     LIBOR Loans.  Loans bearing  interest  calculated by reference to the LIBOR
Rate.

     LIBOR Rate. For any Interest  Period with respect to a LIBOR Loan, the rate
of  interest  equal  to (i) the rate  determined  by the  Agent at which  Dollar
deposits for such Interest Period are offered based on information  presented on
Telerate Page 3750 as of 11:00 a.m. London time two LIBOR Business Days prior to
the first day of such  Interest  Period,  divided by (ii) a number equal to 1.00
minus the Reserve Rate, if applicable.

     Loan and Letter of Credit Request. See ss.2.6.

     Loan  Documents.   This  Agreement,   the  Notes,   the  Letter  of  Credit
Applications, the Letters of Credit, and the Stock Pledge Agreements.

     Loans.  A borrowing  hereunder  consisting of one or more loans made by the
Banks or BKB to the  Borrowers  under  the  procedures  described  in  ss.2.1 or
ss.2.11 hereof.

     Majority  Banks.  The Banks with sixty-six and two thirds percent (66 2/3%)
of the Total  Commitment;  provided that, in the event that the Total Commitment
has been terminated, the Majority Banks shall be the Banks holding sixty-six and
two thirds percent (66 2/3%) of the aggregate  outstanding  principal  amount of
the Loans on such date.

     MasTec  International  Group.  MasTec   International,   Inc.,  a  Delaware
corporation, its direct and indirect Subsidiaries, and the Sintel Group.

     Maturity Date. June 9, 2000; as the same may be extended pursuant toss.2.8,
but which date shall in no event be later than -------- ---- June 9, 2002.
        
     Maximum Drawing Amount. The maximum aggregate amount from time to time that
the beneficiaries may draw under outstanding Letters of Credit.

     Multiemployer  Plan. Any multiemployer  plan within the meaning of ss.3(37)
of ERISA maintained or contributed to by any Borrower or any ERISA Affiliate.

     Notes. Collectively, the Revolving Credit Notes and the Swing Line Note.

     Obligations. All indebtedness, obligations and liabilities of the Borrowers
to any of the Banks or the Agent, individually or collectively,  existing on the
date of this  Agreement  or arising  thereafter,  direct or  indirect,  joint or
several,   absolute  or   contingent,   matured  or  unmatured,   liquidated  or
unliquidated,  secured or  unsecured,  arising by contract,  operation of law or
otherwise,  arising or incurred  under this  Agreement  or any of the other Loan
Documents  or in respect of any of the Loans made or  Reimbursement  Obligations
incurred or any of the Notes, Letter of Credit  Applications,  Letters of Credit
or other instruments at any time evidencing any thereof.

     Parent. MasTec, Inc., a Delaware corporation.

     PBGC. The Pension Benefit Guaranty  Corporation created by ss.4002 of ERISA
and any successor entity or entities having similar responsibilities.

     Permitted Liens. See ss.7.2.

     Person. Any individual,  corporation,  partnership,  trust,  unincorporated
association,  business,  or  other  legal  entity,  and  any  government  or any
governmental agency or political subdivision thereof.

     Pricing Ratio.  As at the end of any quarter,  the ratio of (a) Funded Debt
to (b)  EBITDA  for the  period of four (4)  consecutive  fiscal  quarters  then
ending, as set forth on the most recently delivered Compliance Certificate.

<TABLE>
         
          Pricing Table:
          <S>                         <C>                     <C>              
 ------------------------------ ------------- -------------- -------------------
                                  Applicable     Applicable        Applicable
 Pricing Ratio                  LIBOR Margin    L/C Margin     Commitment Rate
                                 (per annum)    (per annum)       (per annum)
 ------------------------------ ------------- -------------- -------------------
 less than 1.00:1                    0.75%            0.75%             0.250%  
 ------------------------------ ------------- -------------- -------------------
 greater than or equal to
 1.00:1, but less than 1.50:1        1.00%            1.00%             0.250%
 ------------------------------ ------------- -------------- -------------------
 greater than or equal to
 .50:1, but less than 2.00:1         1.25%            1.25%             0.375%
 ------------------------------ ------------- -------------- -------------------

 greater than or equal to 2.00:1     1.50%            1.50%             0.375%
 ------------------------------ ------------- -------------- -------------------
</TABLE>


     Qualified  Accounts  Receivable.  The  aggregate of the unpaid  portions of
Accounts Receivable (net of any credits,  rebates,  offsets,  holdbacks or other
adjustments or commissions payable to third parties that are adjustments to such
Accounts  Receivable)  (i)  that  the  Borrowers  reasonably  and in good  faith
determine to be collectible; (ii) that are with account debtors that (A) are not
affiliates of the Borrowers,  (B) purchased the goods or services giving rise to
the relevant  Account  Receivable  in an arm's length  transaction,  (C) are not
insolvent  or  involved  in  any  case  or  proceeding,   whether  voluntary  or
involuntary,  under any  bankruptcy,  reorganization,  arrangement,  insolvency,
adjustment of debt, dissolution,  liquidation or similar law of any jurisdiction
and (D) are, in the Agent's reasonable judgment, creditworthy; (iii) that are in
payment of  obligations  that have been fully  performed  and are not subject to
dispute or any other  similar  claims that would reduce the cash amount  payable
therefor;  (iv)  that  are not  subject  to any  pledge,  restriction,  security
interest  or other lien or  encumbrance  other  than  those  created by the Loan
Documents;  (v) that are not  outstanding for more than ninety (90) days (or one
hundred and twenty  (120) days in the case of secured CLEC  Accounts  Receivable
not to exceed $5,000,000 in the aggregate at any time) past the earlier to occur
of (A) the date of the respective invoices therefor and (B) the date of shipment
thereof  in the case of goods or the end of the  calendar  month  following  the
provision thereof in the case of services; (vi) that are not due from an account
debtor located in Alabama, Minnesota or New Jersey unless the Borrowers (A) have
received a  certificate  of authority to do business and are in good standing in
such state or (B) have filed a notice of  business  activities  report  with the
appropriate  office or agency of such state for the current year; (vii) that are
payable in Dollars;  and (viii) that are not payable  from an office  outside of
the United States.

     Real Property.  All real property  heretofore,  now, or hereafter  owned or
leased by the Borrowers.

     Reimbursement Obligation.  The Borrowers' obligation to reimburse the Agent
and the Banks on account of any  drawing  under any Letter of Credit as provided
in ss.3.2.

     RCRA. See definition of Release.

     Release.   Shall  have  the   meaning   specified   in  the   Comprehensive
Environmental  Response,  Compensation  and  Liability  Act of 1980,  42  U.S.C.
ss.ss.9601 et seq. ("CERCLA") and the term "Disposal" (or "Disposed") shall have
the meaning specified in the Resource  Conservation and Recovery Act of 1976, 42
U.S.C.  ss.ss.6901  et seq.  ("RCRA") and  regulations  promulgated  thereunder;
provided,  that in the event  either  CERCLA or RCRA is amended so as to broaden
the meaning of any term defined thereby,  such broader meaning shall apply as of
the effective  date of such amendment and provided  further,  to the extent that
the  laws of a state  wherein  the  property  lies  establishes  a  meaning  for
"Release"  or  "Disposal"  which is broader than  specified in either  CERCLA or
RCRA, such broader meaning shall apply.

     Reserve  Rate.  For any day with respect to a LIBOR Loan,  the maximum rate
(expressed as a decimal) at which any lender  subject  thereto would be required
to maintain reserves under Regulation D of the Board of Governors of the Federal
Reserve System (or any subsequent or similar regulation relating to such reserve
requirements)  against  "Eurocurrency  Liabilities"  (as such term is defined in
Regulation D), if such liabilities were  outstanding.  The Reserve Rate shall be
adjusted  automatically  on and as of the  effective  date of any  change in the
Reserve Rate.

     Revolving Credit Loans.  Loans made by the Banks to the Borrowers  pursuant
to ss.2.1.

     Revolving Credit Notes.  The promissory  notes of the Borrowers  evidencing
the Revolving Credit Loans hereunder, dated as of the date of this Agreement and
in substantially the form of Exhibit A hereto.

     Senior Debt. Funded Debt minus Subordinated Debt.

     Sintel. Sistemas e Instalaciones de Telecomunicacion, S.A.

     Sintel Group. Sintel,  Sietel, S.A., Sintelar,  S.A., Sintel Peru, S.A. and
any Subsidiary of Sintel.

     Sintel  Stock  Pledge  Agreement.   The  stock  pledge  agreement  and  the
International   Pledge  Documents  (defined  therein)  among  the  International
Signatories  and the Agent for the  benefit  or in the name of the Banks in form
and substance satisfactory to the Agent.

     Stock Pledge  Agreements.  The U.S.  Stock Pledge  Agreement and the Sintel
Stock Pledge Agreement.

     Subordinated  Debt.  Indebtedness  incurred  by the  Parent  which has been
subordinated to the Obligations; provided that (a) at the time such Subordinated
Debt is  incurred,  no Default or Event of Default  has  occurred or would occur
(including under ss.8.1 hereof) as a result of such  incurrence,  and the Parent
shall have provided the Banks with a calculation of the Leverage Ratios required
by ss.8.1 hereof showing  compliance  therewith on a pro forma basis taking into
account the  incurrence of such  Subordinated  Debt,  and (b) the  documentation
evidencing  such  Subordinated  Debt shall have been  delivered to the Agent and
shall contain all of the following  characteristics:  (i) it shall be unsecured,
(ii) it shall  bear a market  rate of  interest,  (iii) it shall have an average
weighted  maturity  of at least  seven  (7)  years,  (iv) it shall  not  require
principal  repayments  thereof  prior to the  Maturity  Date,  (v) it shall have
financial covenants (including covenants relating to incurrence of indebtedness)
which are meaningfully  less  restrictive  than those set forth herein,  (vi) it
shall have no restrictions on the Parent's or any of its  Subsidiaries'  ability
to grant liens securing  indebtedness  ranking senior to such Subordinated Debt,
(vii) it shall permit the  incurrence of senior  indebtedness  under this Credit
Agreement  (and under any  refinancings  hereof) in a principal  amount at least
equal  to the  Total  Commitment  hereunder  at the time of  incurrence  of such
Subordinated  Debt minus any  mandatory  or  optional  reductions  thereof  plus
$25,000,000,  (viii) it may be cross-accelerated  with the Obligations and other
senior  indebtedness of the Borrowers (but shall not be  cross-defaulted  except
for  payment  defaults  which the senior  lenders  have not  waived)  and may be
accelerated upon bankruptcy,  (ix) it shall provide that (A) upon any payment or
distribution of the assets of the Parent or its  Subsidiaries  (including  after
the  commencement of a bankruptcy  proceeding) of any kind or character,  all of
the  Obligations  (including  interest  accruing after the  commencement  of any
bankruptcy  proceeding  at the rate  specified  for the  applicable  Obligation,
whether or not such interest is an allowable claim in any such proceeding) shall
be paid in full  prior to any  payment  being  received  by the  holders  of the
Subordinated  Debt and (B) until all of the Obligations  (including the interest
described in subclause (A) above) are paid in full, any payment or  distribution
to which the  holders of the  Subordinated  Debt would be  entitled  but for the
subordination  provisions  of the type  described in clauses (x) and (xi) hereof
shall be made to the holders of the  Obligations,  (x) it shall  provide that in
the event of a payment default under ss.12.1(a) or (b) hereof,  the Parent shall
not be required to pay the  principal  of, or any  interest,  fees and all other
amounts payable with respect to the Subordinated Debt until the Obligations have
been paid in full in cash,  (xi) it shall provide that in the event of any other
Event of Default,  the Banks shall be permitted to block  payments of principal,
interest,  fees and all other amounts  payable with respect to the  Subordinated
Debt for a period of 180 days, and (xii) it shall  acknowledge  that none of the
provisions  outlined in part (b) of this definition can be amended,  modified or
otherwise altered without the prior written consent of the Banks.

     Subsidiary. Any corporation,  association,  trust, or other business entity
of which the  designated  parent  shall at any time own  directly or  indirectly
through a  Subsidiary  or  Subsidiaries  at least a majority of the  outstanding
capital stock or other interest entitled to vote generally.

     Swing  Line  Loans.  Loans  made  by  BKB  to  the  Borrowers  pursuant  to
ss.2.11(a).

     Swing Line Note. The promissory note of the Borrowers to BKB evidencing the
Swing  Line  Loans  hereunder,  dated  as of the date of this  Agreement  and in
substantially the form of Exhibit B hereto.

     Swing Line Settlement.  The making or receiving of payments, in immediately
available  funds,  by the Banks to or from the Agent in accordance  with ss.2.11
hereof  to the  extent  necessary  to  cause  each  Bank's  actual  share of the
outstanding amount of the Loans to be equal to such Bank's Commitment Percentage
of the outstanding amount of such Loans, in any case when, prior to such action,
the actual share is not so equal.

     Swing Line Settlement Amount. See ss.2.11(b).

     Swing Line Settlement Date. See ss.2.11(b).

     Swing Line Settling Bank. See ss.2.11(b).

     Total Commitment. See ss.2.1.

     U.S. Stock Pledge  Agreement.  The stock pledge agreement among the Parent,
its U.S.  Subsidiaries (other than Excluded  Subsidiaries) and the Agent for the
benefit or in the name of the Banks in form and  substance  satisfactory  to the
Agent.

     U.S. Subsidiaries. Subsidiaries of the Parent which are organized under the
laws of the United  States of  America,  any state  thereof or the  District  of
Columbia.

     ss.1.2. Rules of Interpretation.

                  (a) A reference  to any document or  agreement  shall  include
         such document or agreement as amended,  modified or  supplemented  from
         time to  time in  accordance  with  its  terms  and the  terms  of this
         Agreement.

                  (b) The singular  includes the plural and the plural  includes
the singular.

                  (c)  A  reference  to  any  law  includes  any   amendment  or
modification to such law.

                  (d)  A  reference  to  any  Person   includes  its   permitted
successors and permitted assigns.

                  (e) Accounting  terms  capitalized  but not otherwise  defined
         herein  have  the  meanings  assigned  to  them by  generally  accepted
         accounting  principles  applied on a consistent basis by the accounting
         entity to which they refer.

                  (f) The words  "include,"  "includes" and  "including" are not
limiting.

                  (g) All terms not specifically  defined herein or by generally
         accepted accounting principles,  which terms are defined in the Uniform
         Commercial Code as in effect in the Commonwealth of Massachusetts, have
         the meanings assigned to them therein.

                  (h) Reference to a particular  "ss." refers to that section of
this Agreement unless otherwise indicated.

                  (i) The words  "herein,"  "hereof,"  "hereunder"  and words of
         like  import  shall refer to this  Agreement  as a whole and not to any
         particular section or subdivision of this Agreement.

     ss.2. THE REVOLVING CREDIT FACILITY.

     ss.2.1.  Commitment to Lend.  Subject to the terms and conditions set forth
in this Agreement,  each of the Banks severally  agrees to lend to the Borrowers
and the Borrowers may borrow,  repay,  and reborrow from time to time commencing
on the Closing Date and prior to the Maturity Date, upon notice by the Borrowers
to the Agent given in accordance with ss.2.6, its Commitment  Percentage of such
sums as are requested by the Borrowers,  provided that the outstanding amount of
Loans  (including  the Swing Line Loans) and the Maximum  Drawing  Amount of the
Letters of Credit shall not exceed a maximum  aggregate  amount  outstanding  of
$125,000,000  at any time,  as such  amount  may be reduced  pursuant  to ss.2.2
hereof (the  "Total  Commitment").  Each  request for a Loan or Letter of Credit
hereunder shall constitute a  representation  and warranty by the Borrowers that
the  conditions  set  forth in ss.9 and  ss.10,  as the case may be,  have  been
satisfied on the date of such request.

     ss.2.2. Reduction of Total Commitment.

                  (a) The  Borrowers  shall  have the right at any time and from
         time to time upon two (2) Business  Days' prior  written  notice to the
         Agent to reduce by  $10,000,000  or an  integral  multiple  thereof  or
         terminate  entirely the Total Commitment,  whereupon the Commitments of
         the Banks shall be reduced pro rata in accordance with their respective
         Commitment  Percentages  of the amount  specified in such notice or, as
         the case may be,  terminated.  The Agent will notify the Banks promptly
         after receiving any notice of the Borrowers  delivered pursuant to this
         ss.2.2.  Notwithstanding  the  foregoing,  at no  time  may  the  Total
         Commitment be reduced to an amount less than the sum of (i) the Maximum
         Drawing Amount, and (ii) all Loans then outstanding.

                  (b) No reduction or termination of the  Commitments  once made
         may be revoked;  the portion of the  Commitments  reduced or terminated
         may not be  reinstated;  and  amounts  in  respect  of such  reduced or
         terminated portion may not be reborrowed.

     ss.2.3. The Revolving Credit Notes; the Swing Line Note.

                  (a) The Revolving  Credit Loans shall be evidenced by separate
         promissory notes of the Borrowers in substantially  the form of Exhibit
         A hereto (each a "Revolving Credit Note"), dated as of the date hereof.
         One Revolving Credit Note shall be payable to the order of each Bank in
         a principal  amount equal to such Bank's  Commitment  or, if less,  the
         outstanding  amount of all  Revolving  Credit  Loans made by such Bank,
         plus interest accrued thereon, as set forth herein.

                  (b) The Swing Line Loans shall be  evidenced  by a  promissory
         note of the  Borrowers  in  substantially  the form of Exhibit B hereto
         (the "Swing Line Note"),  dated as of the date  hereof.  The Swing Line
         Note shall be payable to BKB in the principal  amount of $5,000,000 or,
         if less,  the  outstanding  amount of all Swing Line Loans made by BKB,
         plus interest accrued thereon, as set forth herin.

                  (c) The Borrowers  irrevocably  authorize each Bank to make or
         cause to be made, in connection with a Drawdown Date of any Loan, or at
         the time of receipt of any payment of principal on such Bank's Note(s),
         an appropriate notation on such Bank's records reflecting the making of
         such Loan or the  receipt  of such  payment  (as the case may be).  The
         outstanding  amount of the Loans set forth on such Bank's  record shall
         be prima  facie  evidence of the  principal  amount  thereof  owing and
         unpaid to such Bank,  but the  failure  to  record,  or any error in so
         recording,  any such  amount  shall not limit or  otherwise  affect the
         obligations  of the  Borrowers  hereunder  or  under  any  Note to make
         payments of principal of or interest on any Note when due.

     ss.2.4. Interest on Loans.

                  (a) The outstanding  principal  amount of the Revolving Credit
         Loans  shall bear  interest at the rate per annum equal to (i) the Base
         Rate, or (ii) at the Borrowers'  option as provided  herein,  the LIBOR
         Rate plus the Applicable LIBOR Margin.

                  (b) The outstanding  principal  amount of the Swing Line Loans
         shall bear interest at the rate per annum equal to the Applicable Swing
         Line Rate.

                  (c) Interest  shall be payable (i) quarterly in arrears on the
         first Business Day of the next succeeding  quarter,  commencing July 1,
         1997, on Base Rate Loans and Swing Line Loans,  (ii) on the last day of
         the applicable  Interest Period,  and if such Interest Period is longer
         than  three  (3)  months,  also  on the  last  day of the  third  month
         following the commencement of such Interest Period, on LIBOR Loans, and
         (iii) on the Maturity Date for all Loans.

     ss.2.5.  Election  of LIBOR Rate;  Notice of  Election;  Interest  Periods;
Minimum Amounts.

                  (a) At the Borrowers'  option,  so long as no Default or Event
         of Default has occurred and is then  continuing,  the Borrowers may (i)
         elect to convert any Revolving  Credit Loan or a portion thereof from a
         Base Rate Loan to a LIBOR Loan, (ii) at the time of any Loan and Letter
         of Credit Request,  specify that such requested  Revolving  Credit Loan
         shall be a LIBOR  Loan,  or (iii)  upon  expiration  of the  applicable
         Interest  Period,  elect to maintain  an  existing  LIBOR Loan as such,
         provided  that the  Borrowers  give  notice  to the Agent  pursuant  to
         ss.2.5(b)  hereof.  Upon  determining  any LIBOR Rate,  the Agent shall
         forthwith  provide notice  thereof to the Borrowers and the Banks,  and
         each such notice to the  Borrowers  and the Banks  shall be  considered
         prima facie correct and binding, absent manifest error.

                  (b) Three (3) LIBOR  Business  Days prior to the making of any
         LIBOR Loan or the conversion of any Base Rate Loan to a LIBOR Loan, or,
         in the case of an outstanding  LIBOR Loan,  the expiration  date of the
         applicable  Interest Period, the Borrowers shall give telephonic notice
         (confirmed by telecopy on the same LIBOR Business Day) to the Agent not
         later  than  11:00  a.m.  (Boston  time) of its  election  pursuant  to
         ss.2.5(a).  Each such notice  delivered to the Agent shall  specify the
         aggregate principal amount of the Revolving Credit Loans to be borrowed
         or maintained as or converted to LIBOR Loans and the requested duration
         of the Interest  Period that will be applicable to such LIBOR Loan, and
         shall be irrevocable  and binding upon the Borrowers.  If the Borrowers
         shall  fail to give  the  Agent  notice  of  their  election  hereunder
         together with all of the other  information  required by this ss.2.5(b)
         with respect to any Revolving  Credit Loan, such Loan shall be deemed a
         Base Rate Loan.  In the event that the  Borrowers  fail to provide  any
         such notice with respect to the continuation of any LIBOR Loan as such,
         then such LIBOR Loan shall be  automatically  converted  to a Base Rate
         Loan at the end of the then expiring Interest Period relating thereto.

                  (c)  Notwithstanding  anything  herein  to the  contrary,  the
         Borrowers  may not specify an Interest  Period that would extend beyond
         the Maturity Date.

                  (d)      All  Revolving  Credit  Loans  shall be in a  minimum
         amount of not less than $5,000,000 and in integral multiples of 
         $500,000 above such amount.

                  (e)      In no event shall the Borrowers have more than seven 
         (7) different  maturities of LIBOR Loans outstanding at any time.

     ss.2.6.  Requests for Revolving  Credit Loans.  The Borrowers shall give to
the Agent written notice in the form of Exhibit C hereto (or  telephonic  notice
confirmed by telecopy on the same  Business Day in the form of Exhibit C hereto)
of each Revolving Credit Loan requested  hereunder (a "Loan and Letter of Credit
Request") not later than (a) 9:00 a.m.  (Boston  time) on the proposed  Drawdown
Date of any Base Rate Loan,  or (b) three (3) LIBOR  Business  Days prior to the
proposed Drawdown Date of any LIBOR Loan. Each such notice shall be given by the
Parent as agent for the Borrowers and shall specify the principal  amount of the
Revolving  Credit Loan  requested and shall include a current Loan and Letter of
Credit  Request,  reflecting the Maximum Drawing Amount of all Letters of Credit
outstanding.  Each Loan and Letter of Credit  Request shall be  irrevocable  and
binding  on the  Borrowers  and shall  obligate  the  Borrowers  to  accept  the
Revolving  Credit Loan requested  from the Banks on the proposed  Drawdown Date.
Each of the  representations  and warranties  made by or on behalf of any of the
Borrowers to the Banks or the Agent in this Agreement or any other Loan Document
shall be true and correct in all material  respects when made and shall, for all
purposes  of this  Agreement,  be deemed to be repeated on and as of the date of
the  submission  of any Loan and Letter of Credit  Request  and on and as of the
Drawdown Date of any Loan  (including  Swing Line Loans) or the date of issuance
or renewal of any  Letter of Credit  (except to the extent of changes  resulting
from transactions contemplated or permitted by this Agreement and the other Loan
Documents and changes  occurring in the ordinary  course of business that do not
in the aggregate  have a material  adverse  effect on the  Borrowers  taken as a
whole,  or to the extent  that such  representations  and  warranties  expressly
relate to an earlier date).  The Agent shall  promptly  notify each Bank of each
Loan and Letter of Credit Request received by the Agent (i) not later than 12:00
p.m.  (Boston time) on the proposed  Drawdown  Date of any Base Rate Loan,  (ii)
three (3) LIBOR  Business Days prior to the proposed  Drawdown Date of any LIBOR
Loan to be made to the  Borrowers.  or (iii) on a monthly  basis with respect to
Letters of Credit.

     ss.2.7. Funds for Revolving Credit Loans.

                  (a) Not later  than 1:00 p.m.  (Boston  time) on the  proposed
         Drawdown  Date of any Revolving  Credit  Loans,  each of the Banks will
         make  available  to the  Agent,  at its  Head  Office,  in  immediately
         available funds, the amount of such Bank's Commitment Percentage of the
         amount of the requested  Revolving Credit Loans. Upon receipt from each
         Bank of such  amount,  and upon  receipt of the  documents  required by
         ss.ss.9 and 10 and the  satisfaction of the other  conditions set forth
         therein, to the extent applicable, the Agent will make available to the
         Borrowers  the  aggregate  amount of such  Revolving  Credit Loans made
         available to the Agent by the Banks on the Drawdown  Date.  The failure
         or refusal of any Bank to make  available to the Agent at the aforesaid
         time  and  place on any  Drawdown  Date the  amount  of its  Commitment
         Percentage  of the requested  Revolving  Credit Loans shall not relieve
         any other Bank from its several obligation  hereunder to make available
         to the Agent the amount of such other Bank's  Commitment  Percentage of
         any requested Revolving Credit Loans.

                  (b) The Agent may, unless notified to the contrary by any Bank
         prior to a Drawdown  Date,  assume that such Bank has made available to
         the Agent on such  Drawdown  Date the amount of such Bank's  Commitment
         Percentage  of the  Revolving  Credit Loans to be made on such Drawdown
         Date,  and the Agent may (but it shall not be required to), in reliance
         upon such  assumption,  make available to the Borrowers a corresponding
         amount.  If any Bank makes available to the Agent such amount on a date
         after such Drawdown Date, such Bank shall pay to the Agent on demand an
         amount equal to the product of (i) the average  computed for the period
         referred to in clause (iii) below,  of the  weighted  average  interest
         rate paid by the Agent for federal  funds  acquired by the Agent during
         each day included in such period,  times (ii) the amount of such Bank's
         Commitment  Percentage of such  Revolving  Credit Loans,  times (iii) a
         fraction, the numerator of which is the number of days that elapse from
         and  including  such  Drawdown  Date to the date on which the amount of
         such Bank's Commitment  Percentage of such Revolving Credit Loans shall
         become immediately available to the Agent, and the denominator of which
         is 365. A statement of the Agent submitted to such Bank with respect to
         any amounts owing under this paragraph  shall be prima facie  evidence,
         absent manifest error, of the amount due and owing to the Agent by such
         Bank.  If the  amount  of such  Bank's  Commitment  Percentage  of such
         Revolving  Credit Loans is not made available to the Agent by such Bank
         within three (3) Business Days  following such Drawdown Date, the Agent
         shall be entitled to recover such amount from the  Borrowers on demand,
         with interest thereon at the rate per annum applicable to the Revolving
         Credit Loans made on such Drawdown Date.

     ss.2.8.  Maturity  of  the  Loans;  Annual  Option  to  Extend.  The  Total
Commitment  shall  terminate  and all  Loans  shall  be due and  payable  on the
Maturity Date; provided,  however,  that such Total Commitment and Maturity Date
may be extended for  successive  annual  periods up to a final  Maturity Date of
June 9, 2002,  as provided  in this  ss.2.8 and at each Bank's sole  discretion,
upon the written request of the Borrowers.  A written  request,  if any, for the
extension  of the  Total  Commitment  and  Maturity  Date  shall be given by the
Borrowers to the Agent and the Banks not less than one-hundred twenty (120) days
prior to the Extension  Date.  Except as expressly  provided in this ss.2.8,  no
extension of the Total  Commitment  and then current  Maturity  Date pursuant to
this ss.2.8 shall be effective  unless all of the Banks shall have approved such
extension  by written  notice to the Agent.  If on or prior to ninety  (90) days
prior  to the  applicable  Extension  Date,  all of the  Banks  consent  to such
extension by written notice to the Agent, the Total Commitment and Maturity Date
automatically  shall be  extended  to that date which is one year later than the
then  current  Maturity  Date.  If on or prior to ninety  (90) days prior to the
applicable  Extension Date, any Bank (a "Declining Bank") shall have objected to
such  requested  extension  by  written  notice  to the  Agent or shall not have
delivered  written notice to the Agent  consenting to such requested  extension,
then the Borrowers or the Agent may, no later than such Extension Date,  replace
each such Declining  Bank if necessary so that, as of such  Extension  Date, the
Total Commitment is not less than  $100,000,000.  In no event shall the Maturity
Date be extended  beyond June 9, 2002;  nor shall the Total  Commitment  of such
extended facility be less than $100,000,000.

     ss.2.9.  Mandatory  Repayments of the Loans. If at any time the outstanding
amount of the Loans plus the Maximum Drawing Amount of all  outstanding  Letters
of Credit  exceeds  the Total  Commitment,  whether  by  reduction  of the Total
Commitment or otherwise,  then the Borrowers shall immediately pay the amount of
such excess to the Agent for  application to the Loans,  or if no Loans shall be
outstanding,   to  be  held  by  the  Agent  as  collateral   security  for  the
Reimbursement  Obligations,  provided,  however,  that  if the  amount  of  cash
collateral  held by the Agent  pursuant to this ss.2.9 exceeds the amount of the
Obligations, the Agent shall return such excess to the Borrowers.

     ss.2.10.  Optional  Prepayments or Repayments of Loans.  Subject to ss.4.8,
the Borrowers shall have the right,  at their  election,  to repay or prepay the
outstanding  amount of the  Loans,  as a whole or in part,  at any time  without
penalty or premium,  provided that such repayments or prepayments  shall be in a
minimum amount of not less than $5,000,000 and in integral multiples of $500,000
above such amount.  The Borrowers shall give the Agent, no later than 11:00 a.m.
(Boston  time) on the Business Day of such  proposed  prepayment  or  repayment,
written  notice (or  telephonic  notice  confirmed  in writing) of any  proposed
prepayment or repayment  pursuant to this ss.2.10,  specifying the proposed date
of prepayment or repayment of Loans and the principal amount to be paid.

     ss.2.11. Swing Line Loans; Settlements.

                  (a) Solely for ease of  administration  of the Loans, BKB may,
         but shall not be required  to, fund Base Rate Loans made in  accordance
         with the provisions of this  Agreement in amounts less than  $5,000,000
         ("Swing Line Loans") provided that the outstanding amount of Swing Line
         Loans  advanced by BKB  hereunder  shall not exceed  $5,000,000  at any
         time. Each Bank shall remain  severally and  unconditionally  liable to
         fund its  Commitment  Percentage of such Swing Line Loans on each Swing
         Line Settlement Date and, in the event BKB chooses not to fund all Base
         Rate Loans requested on any date, to fund its Commitment  Percentage of
         the  Base  Rate  Loans  requested,   subject  to  satisfaction  of  the
         provisions  hereof relating to the making of Base Rate Loans.  Prior to
         each Swing Line Settlement, all payments or repayments of the principal
         of, and  interest on, Swing Line Loans shall be credited to the account
         of BKB.

                  (b) The Banks  shall  effect a Swing Line  Settlement  of each
         Swing Line Loan on (i) the Business Day  immediately  following any day
         on which the Agent gives  notice of a Swing Line  Settlement,  (ii) the
         Business Day  immediately  following the Agent's  becoming aware of the
         existence of any Default or Event of Default,  (iii) the Maturity Date,
         and (iv) the Business Day  immediately  following  any day on which the
         outstanding  amount  of  Swing  Line  Loans  advanced  by  BKB  exceeds
         $5,000,000  (each such date, a "Swing Line Settlement  Date").  One (1)
         Business Day prior to each such Swing Line  Settlement  Date, the Agent
         shall  give  telephonic  notice  to the  Banks  of (A)  the  respective
         outstanding  amount  of  Loans  made by each  Bank as at the  close  of
         business on the prior day, (B) the amount that any Bank,  as applicable
         (a "Swing  Line  Settling  Bank"),  shall  pay to  effect a Swing  Line
         Settlement (a "Swing Line  Settlement  Amount") and (C) the portion (if
         any) of the aggregate Swing Line  Settlement  Amount to be paid to each
         Bank. A statement  of the Agent  submitted to the Banks with respect to
         any amounts owing hereunder shall be prima facie evidence of the amount
         due and owing. Each Swing Line Settling Bank shall, not later than 1:00
         p.m.  (Boston time) on each Swing Line Settlement  Date,  effect a wire
         transfer of immediately available funds to the Agent at its Head Office
         in the amount of such Bank's Swing Line  Settlement  Amount.  The Agent
         shall, as promptly as practicable  during normal business hours on each
         Swing Line  Settlement  Date,  effect a wire  transfer  of  immediately
         available funds to each Bank of the Swing Line Settlement  Amount to be
         paid to such  Bank.  All  funds  advanced  by any Bank as a Swing  Line
         Settling  Bank  pursuant to this  ss.2.11(b)  shall for all purposes be
         treated as a Base Rate Loan made by such Swing  Line  Settling  Bank to
         the  Borrowers,  and all funds  received  by any Bank  pursuant to this
         ss.2.11(b)  shall for all  purposes be treated as  repayment of amounts
         owed by the  Borrowers  with  respect  to Base Rate  Loans made by such
         Bank.  In the event  that any  Bankruptcy  Event  prevents a Swing Line
         Settling  Bank from making any Swing Line  Settlement  as  contemplated
         hereby,  such Swing Line Settling Bank will make such  dispositions and
         arrangements,   either   by  way   of   purchase   of   participations,
         distribution,  pro tanto assignment of claims, subrogation or otherwise
         as shall  result  in each  Bank's  share of the  outstanding  Revolving
         Credit  Loans  being  equal,  as  nearly  as may  be,  to  such  Bank's
         Commitment Percentage of the outstanding amount of the Revolving Credit
         Loans.

                  (c) The Agent may  (unless  notified  to the  contrary  by any
         Swing Line  Settling  Bank by 12:00 noon (Boston time) one (1) Business
         Day prior to the Settlement  Date) assume that each Swing Line Settling
         Bank has made  available (or will make  available by the time specified
         in ss.2.11(b)) to the Agent its Swing Line Settlement  Amount,  and the
         Agent  may (but  shall  not be  required  to),  in  reliance  upon such
         assumption,  make available to each  applicable Bank its share (if any)
         of the  aggregate  Swing  Line  Settlement  Amount.  If the Swing  Line
         Settlement Amount of such Swing Line Settling Bank is made available to
         the Agent by such Swing Line  Settling  Bank on a date after such Swing
         Line Settlement Date, such Swing Line Settling Bank shall pay the Agent
         on demand an amount equal to the product of (i) the  average,  computed
         for the period  referred  to in clause  (iii)  below,  of the  weighted
         average  annual  interest  rate  paid by the Agent  for  federal  funds
         acquired  by the Agent  during each day  included in such period  times
         (ii) such Swing Line  Settlement  Amount  times (iii) a  fraction,  the
         numerator of which is the number of days that elapse from and including
         such Swing Line  Settlement Date to but not including the date on which
         such Swing Line Settlement Amount shall become immediately available to
         the Agent,  and the  denominator  of which is 365. Upon payment of such
         amount such Swing Line Settling Bank shall be deemed to have  delivered
         its Swing Line Settlement  Amount on the Swing Line Settlement Date and
         shall become entitled to interest payable by the Borrowers with respect
         to such Swing Line Settling Bank's Swing Line  Settlement  Amount as if
         such share were  delivered on the Swing Line  Settlement  Date. If such
         Swing Line Settlement Amount is not in fact made available to the Agent
         by such Swing Line Settling Bank within three (3) Business Days of such
         Swing Line Settlement Date, the Agent shall be entitled to recover such
         amount from the Borrowers, with interest thereon at the Base Rate.

                  (d) After any Swing Line  Settlement  Date, any payment by the
         Borrowers of Swing Line Loans  hereunder  shall be allocated  among the
         Banks,  in  amounts  determined  so  as  to  provide  that  after  such
         application  and the related  Swing Line  Settlement,  the  outstanding
         amount of Loans of each Bank  equals,  as nearly as  practicable,  such
         Bank's Commitment Percentage of the aggregate amount of Loans.

     ss.3. LETTERS OF CREDIT.

     ss.3.1. Letter of Credit Commitments.

                  (a)  Subject  to the  terms  and  conditions  hereof  and  the
         execution and receipt of a Loan and Letter of Credit Request reflecting
         the  Maximum  Drawing  Amount of all Letters of Credit  (including  the
         requested  Letter of Credit)  and a Letter of Credit  Application,  the
         Agent, on behalf of the Banks and in reliance upon the agreement of the
         Banks  set  forth  in  ss.3.1(b)  and  upon  the   representations  and
         warranties of the Borrowers contained herein, subject to the provisions
         of ss.ss.2.6 and 19.2 hereof, agrees to issue, extend and renew for the
         account of the Borrowers one or more standby or documentary  letters of
         credit  (individually,  a "Letter of  Credit"),  in such form as may be
         requested  from  time to time by the  Borrowers  and  agreed  to by the
         Agent;  provided,  however,  that, after giving effect to such request,
         the aggregate Maximum Drawing Amount of all Letters of Credit issued at
         any time under this  ss.3.1(a)  shall not  exceed  $10,000,000,  and no
         Letter of Credit shall have an  expiration  date later than the earlier
         of (i) one (1) year after the date of  issuance of the Letter of Credit
         (which may incorporate  automatic renewals for periods of up to one (1)
         year,  provided  that  the  Agent  may,  upon 30  days'  notice  to the
         beneficiary, cancel such Letter of Credit which has been renewed beyond
         its initial  one (1) year term),  or (ii) thirty (30) days prior to the
         Maturity Date.

                  (b) Each Bank  severally  agrees  that it shall be  absolutely
         liable,  without  regard to the  occurrence  of any Default or Event of
         Default or any other condition precedent  whatsoever,  to the extent of
         such Bank's Commitment  Percentage  thereof,  to reimburse the Agent on
         demand for the amount of each draft paid by the Agent under each Letter
         of  Credit to the  extent  that such  amount is not  reimbursed  by the
         Borrowers  pursuant to ss.3.2 (such  agreement  for a Bank being called
         herein the "Letter of Credit Participation" of such Bank).

                  (c) Each such  payment  made by a Bank shall be treated as the
         purchase by such Bank of a  participating  interest  in the  Borrowers'
         Reimbursement  Obligation  under  ss.3.2  in an  amount  equal  to such
         payment.  Each Bank shall share in  accordance  with its  participating
         interest in any interest which accrues pursuant to ss.3.2.

     ss.3.2.  Reimbursement  Obligation of the Borrowers. In order to induce the
Agent to  issue,  extend  and  renew  each  Letter  of  Credit  and the Banks to
participate therein, the Borrowers hereby agree to reimburse or pay to the Agent
with respect to each Letter of Credit  issued,  extended or renewed by the Agent
hereunder as follows:

                  (a) on each date that any draft  presented under any Letter of
         Credit is honored  by the Agent or the Agent  otherwise  makes  payment
         with  respect  thereto,  (i) the amount paid by the Agent under or with
         respect  to such  Letter of  Credit,  and (ii) the amount of any taxes,
         fees,  charges or other costs and expenses  whatsoever  incurred by the
         Agent or any Bank in  connection  with any payment made by the Agent or
         any Bank under,  or with  respect to, such Letter of Credit,  provided,
         however,  that if the  Borrowers do not reimburse the Agent on the date
         the Agent makes  payment  with  respect to such Letter of Credit,  such
         amount shall, provided that a Bankruptcy Event has not occurred, become
         automatically a Revolving Credit Loan which is a Base Rate Loan; and

                  (b)  upon  the  Maturity  Date  or  the  acceleration  of  the
         Reimbursement  Obligations  with  respect  to all  Letters of Credit in
         accordance  with ss.12,  an amount  equal to the then  Maximum  Drawing
         Amount  of  all   Letters  of  Credit  and  any  unpaid   Reimbursement
         Obligations, which amount shall be held by the Agent for the benefit of
         the  Banks  and the  Agent  as cash  collateral  for all  Reimbursement
         Obligations,  provided,  however, that if the amount of cash collateral
         held by the Agent  pursuant  to this  ss.3.2  exceeds the amount of the
         Obligations, the Agent shall return such excess to the Borrowers.

     ss.3.3.  Obligations Absolute.  The Borrowers'  obligations under this ss.3
shall  be  absolute  and  unconditional  under  any  and all  circumstances  and
irrespective  of the  occurrence  of any  Default  or  Event of  Default  or any
condition precedent whatsoever or any setoff, counterclaim or defense to payment
which the  Borrowers  may have or have had  against  the Agent,  any Bank or any
beneficiary  of a Letter of Credit.  The Borrowers  further agree with the Agent
and the Banks that the Agent and the Banks shall not be responsible for, and the
Borrowers'  Reimbursement  Obligations  under  ss.3.2  shall not be affected by,
among  other  things,  the  validity  or  genuineness  of  documents  or of  any
endorsements  thereon,  even if such documents should in fact prove to be in any
or all respects  invalid,  fraudulent or forged, or any dispute between or among
the  Borrowers,  the  beneficiary  of any  Letter  of  Credit  or any  financing
institution  or other party to which any Letter of Credit may be  transferred or
any claims or defenses  whatsoever of the Borrowers  against the  beneficiary of
any Letter of Credit or any such  transferee.  The Agent and the Banks shall not
be  liable  for any  error,  omission,  interruption  or delay in  transmission,
dispatch  or  delivery  of  any  message  or  advice,  however  transmitted,  in
connection with any Letter of Credit.  The Borrowers agree that any action taken
or omitted by the Agent or any Bank under or in  connection  with each Letter of
Credit and the related  drafts and  documents,  if done in good faith,  shall be
binding upon the  Borrowers and shall not result in any liability on the part of
the Agent or any Bank to the Borrowers.

     ss.3.4.  Reliance by Agent. To the extent not inconsistent with ss.3.4, the
Agent shall be entitled to rely,  and shall be fully  protected in relying upon,
any Letter of Credit, draft, writing, resolution,  notice, consent, certificate,
affidavit,  letter,  cablegram,  telegram,  telecopy, telex or teletype message,
statement,  order or other document believed by it to be genuine and correct and
to have been  signed,  sent or made by the  proper  Person or  Persons  and upon
advice  and  statements  of legal  counsel,  independent  accountants  and other
experts selected by the Agent.

     ss.4. FEES, PAYMENTS, AND COMPUTATIONS; JOINT AND SEVERAL LIABILITY.

     ss.4.1. Fees.

                  (a) Commitment  Fee. The Borrowers  agree to pay to the Agent,
         for the accounts of the Banks,  a fee (the  "Commitment  Fee") equal to
         the Applicable  Commitment  Rate multiplied by the amount of the unused
         portion of the Total Commitment during each calendar quarter or portion
         thereof  from the date hereof to the  Maturity  Date (or to the date of
         termination  in  full  of  the  Total  Commitment,   if  earlier).  The
         Commitment  Fee shall be payable  quarterly in arrears on the first day
         of each calendar quarter for the immediately preceding calendar quarter
         commencing on July 1, 1997, with a final payment on the Maturity Date.

                  (b) Letter of Credit Fees. The Borrowers  shall pay in advance
         on the date of issuance of each Letter of Credit an issuance fee to the
         Agent for its  account  equal to one eighth of one  percent  (1/8%) per
         annum on the  Maximum  Drawing  Amount of each  Letter  of Credit  (the
         "Issuance  Fee").  The Borrowers shall also pay quarterly in advance on
         the first  Business Day of each fiscal quarter a fee to the Agent equal
         to the Applicable L/C Margin  multiplied by the Maximum  Drawing Amount
         of all  outstanding  Letters of Credit  (the  "Letter of Credit  Fee"),
         which fee shall be for the  accounts  of the Banks in  accordance  with
         their respective  Commitment  Percentages.  In addition to the Issuance
         Fee and the Letter of Credit Fee, the Borrowers shall pay to the Agent,
         for its own  account,  all  related  customary  administrative  fees in
         accordance with customary practice.

     ss.4.2. Payments.

                  (a)  All  payments  of  principal,   interest,   Reimbursement
         Obligations,  fees and any other  amounts due hereunder or under any of
         the other Loan Documents shall be made to the Agent, for the respective
         accounts of the Banks and the Agent, to be received at the Agent's Head
         Office in immediately  available  funds by 12:00 p.m.  (Boston time) on
         any due date.  If a payment  (other  than with  respect  to Swing  Line
         Loans) is received by the Agent at or before 12:00 p.m.  (Boston  time)
         on any Business  Day, the Agent shall on the same Business Day transfer
         in  immediately  available  funds to each of the  Banks  their pro rata
         portion of such payment in accordance with their respective  Commitment
         Percentages.  If such payment is received by the Agent after 12:00 p.m.
         (Boston time) on any Business  Day, such transfer  shall be made by the
         Agent to the applicable  Bank(s) on the next Business Day. In the event
         that the  Agent  fails to make such  transfer  to any Bank as set forth
         above,  the Agent  shall pay to such Bank on demand an amount  equal to
         the product of (i) the average,  computed for the period referred to in
         clause (iii) below, of the weighted  average interest rate paid by such
         Bank for funds  acquired by such Bank during each day  included in such
         period,   times  (ii)  the  amount  equal  to  such  Bank's  Commitment
         Percentage  of such payment,  times (iii) a fraction,  the numerator of
         which is the number of days that elapse from and  including the date of
         payment to and  including the date on which the amount due to such Bank
         shall become immediately available to such Bank, and the denominator of
         which is 365.

                  (b) All payments by the  Borrowers  hereunder and under any of
         the other Loan Documents  shall be made without setoff or  counterclaim
         and free and clear of and  without  deduction  for any  taxes,  levies,
         imposts,  duties, charges, fees, deductions,  withholdings,  compulsory
         loans,  restrictions  or  conditions  of any  nature  now or  hereafter
         imposed  or levied by any  jurisdiction  or any  political  subdivision
         thereof or taxing or other  authority  therein unless the Borrowers are
         compelled  by law to make such  deduction or  withholding.  If any such
         obligation  is imposed  upon the  Borrowers  with respect to any amount
         payable by them hereunder or under any of the other Loan Documents, the
         Borrowers  will pay to the Agent,  for the  account of the Banks or (as
         the case may be) the Agent, on the date on which such amount is due and
         payable  hereunder or under such other Loan Document,  such  additional
         amount in  Dollars  as shall be  necessary  to enable  the Banks or the
         Agent to receive the same net amount which the Banks or the Agent would
         have received on such due date had no such obligation been imposed upon
         the Borrowers,  provided  however that the foregoing  obligation to pay
         such additional amounts shall not apply:

                           (i) to any  payment to a Bank if such Bank is not, on
                  the date  hereof  (or on the date it becomes a Bank under this
                  Agreement) and on the date of any change in the lending office
                  of such Bank  identified  after  its  execution,  entitled  by
                  virtue of its status as a non-resident  alien to submit either
                  a Form  1001  (relating  to such  Bank and  entitling  it to a
                  complete  exemption  from  withholding  on all  interest to be
                  received by it  hereunder in respect of the  Revolving  Credit
                  Loans) or Form 4224  (relating  to all interest to be received
                  by such Bank  hereunder in respect of Revolving  Credit Loans)
                  of the U.S. Department of Treasury, or

                           (ii)  to  any  item  referred  to  in  the  preceding
                  sentence  that would not have been imposed but for the failure
                  by  such  Bank  to  comply  with   applicable   certification,
                  information,  documentation  or other  reporting  requirements
                  concerning the nationality, residence, identity or connections
                  of such Bank with the  United  States  if such  compliance  is
                  required by statute or  regulation  of the United  States as a
                  precondition to relief or exemption from such item.

                  The Borrowers will deliver promptly to the Agent  certificates
         or other valid vouchers for all taxes or other charges deducted from or
         paid with respect to payments made by the Borrowers  hereunder or under
         such other Loan Document.

     ss.4.3.  Computations.  All computations of interest on Base Rate Loans and
of Commitment Fees, Letter of Credit Fees or other fees shall,  unless otherwise
expressly  provided  herein,  be based on a 365-day  year (or 366-day  year,  as
applicable) and paid for the actual number of days elapsed.  All computations of
interest on LIBOR Loans shall,  unless otherwise  expressly  provided herein, be
based on a 360-day year and paid for the actual number of days elapsed. Whenever
a payment  hereunder or under any of the other Loan  Documents  becomes due on a
day that is not a Business Day or LIBOR  Business Day (as  applicable),  the due
date for such payment shall be extended to the next  succeeding  Business Day or
LIBOR  Business  Day (as  applicable),  and interest  shall  accrue  during such
extension;  provided that,  for any Interest  Period for any LIBOR Loan, if such
next succeeding  LIBOR Business Day falls in the next succeeding  calendar month
or after the Maturity  Date,  it shall be deemed to end on the  preceding  LIBOR
Business Day.

     ss.4.4.  Additional  Costs,  Etc. If, after the date hereof,  any change in
present  applicable  law or adoption of any applicable law after the date hereof
(including, in either case, without limitation,  statutes, rules and regulations
thereunder  and  interpretations  thereof  by  any  competent  court  or by  any
governmental   or  other   regulatory   body  or  official   charged   with  the
administration  or  the   interpretation   thereof  and  requests,   directives,
instructions and notices at any time or from time to time hereafter made upon or
otherwise  issued to any Bank by any central bank or other  fiscal,  monetary or
other authority, whether or not having the force of law) shall:
                 
                  (a) subject such Bank to any tax, levy, impost,  duty, charge,
         fee,  deduction  or  withholding  of any  nature  with  respect to this
         Agreement,  the other Loan Documents,  such Bank's  Commitment,  or the
         Loans (other than taxes based upon or measured by the income or profits
         of such Bank or any  franchise tax imposed by the  jurisdiction  of its
         incorporation or  organization,  or the location of its lending office,
         hereinafter referred to as "Income Taxes"); or

                  (b)  materially  change  the  basis of  taxation  (except  for
         changes in Income  Taxes) of payments to such Bank of the  principal or
         of the interest on any Loans or any other amounts  payable to such Bank
         under this Agreement or the other Loan Documents; or

                  (c) except as provided in ss.4.5 or as otherwise  reflected in
         the  Base  Rate  or the  LIBOR  Rate,  impose  or  increase  or  render
         applicable  (other  than  to  the  extent  specifically   provided  for
         elsewhere in this Agreement) any special deposit, reserve,  assessment,
         liquidity,  capital adequacy or other similar requirements  (whether or
         not having the force of law) against  assets held by, or deposits in or
         for the  account of, or loans by, or  commitments  of, an office of any
         Bank with  respect to this  Agreement,  the other Loan  Documents,  the
         Commitment, or the Loans; or

                  (d) impose on such Bank any other  conditions or  requirements
         with respect to this Agreement,  the other Loan  Documents,  the Loans,
         such Bank's  Commitment,  or any class of loans or commitments of which
         any of the Loans or such Bank's Commitment forms a part, and the result
         of any of the foregoing is

                           (i) to  increase  the  cost to such  Bank of  making,
                  funding, issuing, renewing, extending or maintaining the Loans
                  or such  Bank's  Commitment,  or issuing or  participating  in
                  Letters of Credit;

                           (ii) to reduce the amount of  principal,  interest or
                  other amount payable to such Bank hereunder on account of such
                  Bank's Commitment or the Loans;

                           (iii) to require  such Bank to make any payment or to
                  forego any interest or other sum payable hereunder, the amount
                  of  which  payment  or  foregone  interest  or  other  sum  is
                  calculated  by  reference  to the  gross  amount  of  any  sum
                  receivable  or deemed  received by such Bank from the Borrower
                  hereunder,

then,and in each such case,  the Borrowers  will,  upon demand made by such
Bank at any time and from time to time as often as the  occasion  therefore  may
arise (which demand shall be accompanied by a statement  setting forth the basis
of such demand), pay such reasonable additional amounts as will be sufficient to
compensate such Bank for such additional costs,  reduction,  payment or foregone
interest or other sum.

     ss.4.5. Capital Adequacy. If any Bank shall have determined that, after the
date hereof,  the adoption of any applicable  law, rule or regulation  regarding
capital  adequacy,  or any change in any such law, rule, or  regulation,  or any
change in the  interpretation  or  administration  thereof  by any  governmental
authority,  central bank or comparable agency charged with the interpretation or
administration  thereof,  or any request or directive regarding capital adequacy
(whether or not having the force of law) of any such authority,  central bank or
comparable  agency,  has or would have the effect of reducing the rate of return
on  capital  of such  Bank  (or any  corporation  controlling  such  Bank)  as a
consequence  of such Bank's  obligations  hereunder  to a level below that which
such Bank (or any corporation controlling such Bank) could have achieved but for
such  adoption,  change,  request or directive  (taking into  consideration  its
policies  with respect to capital  adequacy) by an amount deemed by such Bank to
be  material,  then from time to time,  within  thirty (30) days after demand by
such Bank (which demand shall be  accompanied  by a statement  setting forth the
basis of such  demand),  the  Borrower  shall pay to such  Bank such  additional
amount or amounts  as will,  in such  Bank's  reasonable  determination,  fairly
compensate  such  Bank  (or any  corporation  controlling  such  Bank)  for such
reduction.

     ss.4.6. Certificate.

     A certificate  setting forth any  additional  amounts  payable  pursuant to
ss.ss.4.4 or 4.5 and a  reasonable  explanation  of such amounts  which are due,
submitted  by any Bank or the  Agent  to the  Borrowers,  shall  be prima  facie
correct and binding, absent manifest error.

     ss.4.7.  Reasonable Efforts to Mitigate.  Each Bank agrees that as promptly
as  practicable  after it  becomes  aware of the  occurrence  of an event or the
existence of a condition that would cause it to be affected under ss.ss.4.4, 4.5
or 4.11, such Bank will give notice thereof to the Borrower,  with a copy to the
Agent, and, to the extent so requested by the Borrower and not inconsistent with
such Bank's internal  policies,  such Bank shall use reasonable efforts and take
such actions as are reasonably appropriate if as a result thereof the additional
moneys  which would  otherwise  be required to be paid to such Bank  pursuant to
such subsections would be materially reduced, or the illegality or other adverse
circumstances which would otherwise require a conversion of such Loans or result
in the  inability to make such Loans  pursuant to such  sections  would cease to
exist,  and in each case if, as determined by such Bank in its sole  discretion,
the taking such actions  would not  adversely  affect such Loans or such Bank or
otherwise  be  disadvantageous  to such  Bank.  To the  extent  practicable  and
applicable,  each Bank shall allocate such cost increases among its customers in
good faith and on an equitable basis.

     ss.4.8. LIBOR Indemnity. The Borrowers agree to indemnify the Banks and the
Agent and to hold them  harmless  from and  against  any loss,  cost or expenses
(including loss of anticipated profits) that the Banks and the Agent may sustain
or incur as a  consequence  of (a)  default by the  Borrowers  in payment of the
principal  amount  of or any  interest  on any  LIBOR  Loans as and when due and
payable,  including  any such loss or  expense  arising  from  interest  or fees
payable by any Bank or the Agent to lenders of funds  obtained by it in order to
maintain its LIBOR Loans,  or (b) default by the Borrowers in making a borrowing
or  conversion  after the  Borrowers  have given (or are  deemed to have  given)
notice  pursuant to ss.2.5 or ss.2.6,  the making of any payment of a LIBOR Loan
or the making of any  conversion of any such LIBOR Loan to a Base Rate Loan on a
day that is not the last day of the  applicable  Interest  Period  with  respect
thereto,  including  interest  or fees  payable  by any Bank to lenders of funds
obtained  by it in  order  to  maintain  any  such  LIBOR  Loans.  Such  loss or
reasonable  expense  shall  include an amount  equal to the  excess,  if any, as
reasonably  determined  by each Bank of (i) its cost of obtaining  the funds for
the LIBOR Loan being paid, prepaid,  converted,  not converted, or not borrowed,
as the case may be  (based on the LIBOR  Rate) for the  period  from the date of
such payment,  prepayment,  conversion,  or failure to borrow or convert, as the
case may be, to the last day of the  Interest  Period for such Loan (or,  in the
case of a failure to borrow,  the Interest  Period for the Loan which would have
commenced  on the date of such  failure  to  borrow)  over  (ii) the  amount  of
interest (as reasonably  determined by such Bank) that would be realized by such
Bank in re-employing  the funds so paid,  prepaid,  converted,  or not borrowed,
converted,  or prepaid for such period or Interest  Period,  as the case may be,
which determinations  shall be prima facie correct and binding,  absent manifest
error.

     ss.4.9.  Interest on Overdue Amounts.  Overdue principal and (to the extent
permitted by applicable law) interest on the Loans and all other overdue amounts
payable  hereunder or under any of the other Loan Documents  shall bear interest
compounded  monthly  and payable on demand at a rate per annum equal to the Base
Rate plus two (2) percent  until such amount  shall be paid in full  (after,  as
well as before, judgment).

     ss.4.10.  Interest  Limitation.  Notwithstanding  any  other  term  of this
Agreement or any Note or any other document  referred to herein or therein,  the
maximum  amount of interest which may be charged to or collected from any person
liable  hereunder or under any Note by any Bank shall be absolutely  limited to,
and shall in no event  exceed,  the  maximum  amount  of  interest  which  could
lawfully be charged or collected under applicable law (including,  to the extent
applicable, the provisions of Section 5197 of the Revised Statutes of the United
States of America,  as amended, 12 U.S.C.  Section 85, as amended),  so that the
maximum of all amounts  constituting  interest under  applicable law,  howsoever
computed,  shall  never  exceed as to any Person  liable  therefor  such  lawful
maximum,  and any term of this  Agreement,  the  Notes,  the  Letter  of  Credit
Applications, or any other document referred to herein or therein which could be
construed as providing  for interest in excess of such lawful  maximum  shall be
and hereby is made  expressly  subject to and modified by the provisions of this
paragraph,  and in the event any  amount in  excess  of the  lawful  maximum  is
charged or  collected  by the Agent or the Banks or paid by the  Borrowers,  the
Borrowers  shall be entitled to the  reimbursement  of such excess together with
interest thereon at the highest lawful rate at the time of such overcharge.

     ss.4.11. Illegality; Inability to Determine LIBOR Rate. Notwithstanding any
other provision of this Agreement, if (a) the introduction of, any change in, or
any change in the  interpretation  of, any law or  regulation  applicable to the
Agent  or any  Bank  shall  make it  unlawful,  or any  central  bank  or  other
governmental  authority  having  jurisdiction  thereof  shall  assert that it is
unlawful, for any Bank or the Agent to perform its obligations in respect of any
LIBOR Loans,  or (b) if the Banks or the Agent shall  reasonably  determine with
respect to LIBOR Loans that (i) by reason of  circumstances  affecting any LIBOR
interbank market,  adequate and reasonable methods do not exist for ascertaining
the LIBOR Rate which would otherwise be applicable  during any Interest  Period,
or (ii)  deposits of Dollars in the relevant  amount for the  relevant  Interest
Period  are not  available  to the  Banks or the  Agent in any  LIBOR  interbank
market, or (iii) the LIBOR Rate does not or will not accurately reflect the cost
to the Banks or the Agent of obtaining or maintaining the applicable LIBOR Loans
during any  Interest  Period,  then the Banks or the Agent shall  promptly  give
telephonic,  telex or cable notice of such determination to the Borrowers (which
notice  shall  be  conclusive  and  binding  upon  the  Borrowers).   Upon  such
notification by the Banks or the Agent, the obligation of the Banks or the Agent
to make LIBOR Loans shall be  suspended  until the Banks or the Agent  determine
that such  circumstances no longer exist, and the outstanding  LIBOR Loans shall
continue to bear interest at the  applicable  rate based on the LIBOR Rate until
the end of the  applicable  Interest  Period,  and  thereafter  shall be  deemed
converted to Base Rate Loans in equal principal amounts.

     ss.4.12. Concerning Joint and Several Liability of the Borrowers.

                  (a) Each of the  Borrowers  is  accepting  joint  and  several
         liability hereunder and under the other Loan Documents in consideration
         of the financial  accommodations to be provided by the Banks under this
         Agreement, for the mutual benefit,  directly and indirectly, of each of
         the Borrowers and in  consideration  of the  undertakings of each other
         Borrower to accept joint and several liability for the Obligations.

                  (b)  Each of the  Borrowers,  jointly  and  severally,  hereby
         irrevocably  and  unconditionally  accepts,  not merely as a surety but
         also as a  co-debtor,  joint  and  several  liability  with  the  other
         Borrowers  with  respect to the payment and  performance  of all of the
         Obligations  (including,  without  limitation,  any Obligations arising
         under this ss.4.12),  it being the intention of the parties hereto that
         all of the  Obligations  shall be the joint and several  Obligations of
         each of the Borrowers without preferences or distinction among them.

                  (c) If and to the extent that any of the Borrowers  shall fail
         to make any payment with respect to any of the  Obligations as and when
         due or to perform any of the  Obligations in accordance  with the terms
         thereof,  then in each such  event the other  Borrowers  will make such
         payment with respect to, or perform, such Obligation.

                  (d)  The  Obligations  of  each  of the  Borrowers  under  the
         provisions of this ss.4.12 constitute full recourse Obligations of each
         of the Borrowers  enforceable against each such corporation to the full
         extent of its  properties  and assets,  irrespective  of the  validity,
         regularity   or   enforceability   of  this   Agreement  or  any  other
         circumstance whatsoever.

                  (e) Except as otherwise  expressly provided in this Agreement,
         each of the  Borrowers  hereby waives notice of acceptance of its joint
         and several  liability,  notice of any Loans made under this Agreement,
         notice of any action at any time taken or omitted by the Banks under or
         in respect of any of the  Obligations,  and,  generally,  to the extent
         permitted by applicable law, all demands, notices and other formalities
         of every kind in connection with this Agreement.  Each of the Borrowers
         hereby assents to, and waives notice of, any extension or  postponement
         of the time for the payment of any of the  Obligations,  the acceptance
         of any payment of any of the Obligations, the acceptance of any partial
         payment thereon, any waiver, consent or other action or acquiescence by
         the Banks at any time or times in respect of any  default by any of the
         Borrowers in the  performance or  satisfaction  of any term,  covenant,
         condition or provision of this Agreement, any and all other indulgences
         whatsoever by the Banks in respect of any of the  Obligations,  and the
         taking, addition,  substitution or release, in whole or in part, at any
         time  or  times,  of any  security  for any of the  Obligations  or the
         addition,  substitution or release,  in whole or in part, of any of the
         Borrowers.  Without  limiting the generality of the foregoing,  each of
         the Borrowers assents to any other action or delay in acting or failure
         to act on the part of the Banks with  respect to the  failure by any of
         the  Borrowers  to  comply  with  any  of its  respective  Obligations,
         including,  without  limitation,  any failure strictly or diligently to
         assert  any right or to pursue  any  remedy  or to  comply  fully  with
         applicable  laws or regulations  thereunder,  which might,  but for the
         provisions of this ss.4.12, afford grounds for terminating, discharging
         or relieving any of the Borrowers, in whole or in part, from any of its
         Obligations  under this ss.4.12,  it being the intention of each of the
         Borrowers  that,  so long as any of the  Obligations  hereunder  remain
         unsatisfied, the Obligations of such Borrowers under this ss.4.12 shall
         not be discharged  except by performance and then only to the extent of
         such  performance.  The Obligations of each of the Borrowers under this
         ss.4.12  shall  not be  diminished  or  rendered  unenforceable  by any
         winding up, reorganization,  arrangement, liquidation,  re-construction
         or  similar  proceeding  with  respect to any of the  Borrowers  or the
         Banks. The joint and several liability of the Borrowers hereunder shall
         continue  in full  force and  effect  notwithstanding  any  absorption,
         merger,  amalgamation  or any  other  change  whatsoever  in the  name,
         membership,  constitution or place of formation of any of the Borrowers
         or the Banks.

                  (f) The provisions of this ss.4.12 are made for the benefit of
         the Banks and their successors and assigns, and may be enforced in good
         faith by them from time to time against any or all of the  Borrowers as
         often as the occasion therefor may arise and without requirement on the
         part of the Banks first to marshal  any of their  claims or to exercise
         any of their  rights  against  any other  Borrower  or to  exhaust  any
         remedies  available to them against any other  Borrower or to resort to
         any  other  source  or  means  of  obtaining  payment  of  any  of  the
         Obligations  hereunder or to elect any other remedy.  The provisions of
         this ss.4.12 shall remain in effect until all of the Obligations  shall
         have been paid in full or otherwise  fully  satisfied.  If at any time,
         any  payment,  or any  part  thereof,  made  in  respect  of any of the
         Obligations,  is rescinded or must otherwise be restored or returned by
         the Banks upon the insolvency,  bankruptcy or  reorganization of any of
         the  Borrowers,  or  otherwise,  the  provisions  of this  ss.4.12 will
         forthwith be reinstated in effect,  as though such payment had not been
         made.

     ss.4.13.  New  Borrowers.  Any  existing or  newly-created  or acquired U.S
Subsidiary of the Parent (other than members of the MasTec International Group),
which (a) has annual gross  revenues of at least  $1,000,000 on an historical or
annualized basis, or (b) is the parent of any other Borrower, shall be Borrowers
hereunder,  and all other U.S.  Subsidiaries of the Parent designated as such by
the  Parent  shall  be  Excluded   Subsidiaries,   provided  that  the  Excluded
Subsidiaries  may not, in the aggregate,  have in excess of five percent (5%) of
consolidated total assets,  consolidated total liabilities or consolidated gross
revenues  of the Parent and its U.S.  Subsidiaries  (other  than  members of the
MasTec  International  Group)  at any  time,  in  each  case  as  determined  in
accordance  with GAAP.  Any  Subsidiary  which is  required to become a Borrower
pursuant  to the terms of this  ss.4.13  shall sign  Notes,  shall enter into an
amendment to this Agreement and the U.S.  Stock Pledge  Agreement with the other
parties hereto providing that such Subsidiary shall become a Borrower hereunder,
and shall provide such other  documentation as the Agent may reasonably request,
including,   without  limitation,   documentation  with  respect  to  conditions
specified in ss.9 hereof.  In such event, the Agent is hereby  authorized by the
parties  to amend  Schedule 1 hereto to include  such  Subsidiary  as a Borrower
hereunder.  The Borrowers  hereby agree to pledge all of their stock of the U.S.
Subsidiaries (including members of the MasTec International Group which are U.S.
Subsidiaries),  other than the stock of Excluded Subsidiaries,  to the Agent for
the  benefit  of the  Banks  pursuant  to the  terms  of the U.S.  Stock  Pledge
Agreement.

     ss.4.14. Replacement of Banks.

     If any Bank (an  "Affected  Bank") (i) makes demand upon the  Borrowers for
(or  if  Borrowers   are  otherwise   required  to  pay)  amounts   pursuant  to
ss.ss.4.2(b),  4.4 or 4.5,  (ii) is unable to make or maintain  LIBOR Loans as a
result of a condition  described in ss.4.11, or (iii) defaults in its obligation
to make Loans or participate  in Letters of Credit in accordance  with the terms
of this Agreement,  the Borrowers or the Agent may, within 90 days of receipt of
such demand, notice (or the occurrence of such other event causing the Borrowers
to be required to pay such  compensation or causing ss.4.11 to be applicable) or
default,  as the case may be, by notice (a  "Replacement  Notice") in writing to
such Affected Bank and the Agent or Borrowers,  as  applicable,  (A) request the
Affected Bank to cooperate  with the  Borrowers in obtaining a replacement  bank
satisfactory  to the Agent  and the  Borrowers  (the  "Replacement  Bank");  (B)
request the non-Affected  Banks to acquire and assume all of the Affected Bank's
Loans and  Commitment and  participate in Letters of Credit as provided  herein,
but none of such Banks shall be under an obligation to do so; or (C) designate a
Replacement  Bank  reasonably   satisfactory  to  the  Agent  or  Borrowers,  as
applicable.  If any satisfactory Replacement Bank shall be obtained,  and/or any
of the non-Affected  Banks shall agree to acquire and assume all of the Affected
Bank's Loans and  Commitment  and  participate  in Letters of Credit,  then such
Affected  Bank shall,  so long as no Event of Default shall have occurred and be
continuing,  assign,  in accordance with ss.17,  all of its  Commitment,  Loans,
Notes and other rights and  obligations  under this Agreement and all other Loan
Documents to such Replacement Bank or non-Affected Banks, as the case may be, in
exchange  for payment of the  principal  amount so assigned and all interest and
fees accrued on the amount so assigned,  plus all other Obligations then due and
payable to the Affected Bank; provided,  however, that (i) such assignment shall
be  without  recourse,  representation  or  warranty  and  shall be on terms and
conditions  reasonably  satisfactory to such Affected Bank and such  Replacement
Bank and/or  non-Affected  Banks, as the case may be, and (ii) prior to any such
assignment,  the  Borrowers  shall have paid to such  Affected  Bank all amounts
properly demanded and unreimbursed under ss.ss.4.2(b), 4.4, 4.5 or 4.8. Upon the
effective date of such assignment the Borrowers shall issue replacement Notes to
such  Replacement Bank and/or  non-Affected  Banks, as the case may be, and such
Replacement Bank shall become a "Bank" for all purposes under this Agreement and
the other Loan Documents.

     ss.5.  REPRESENTATIONS AND WARRANTIES.  The Borrowers jointly and severally
represent and warrant to the Banks that on and as of the date of this  Agreement
(any disclosure on a schedule  pursuant to this ss.5 shall be deemed to apply to
all relevant representations and warranties, regardless of whether such schedule
is referenced in each relevant representation):

     ss.5.1. Corporate Authority.

                  (a)  Incorporation;  Good Standing.  Each of the Borrowers and
         the  International  Signatories  (i) is a corporation  duly  organized,
         validly  existing and in good  standing or in current  status under the
         laws of its  respective  jurisdiction  of  incorporation,  (ii) has all
         requisite  corporate power to own its property and conduct its business
         as now  conducted and as presently  contemplated,  and (iii) is in good
         standing as a foreign corporation and is duly authorized to do business
         in each  jurisdiction  in which its  property or business as  presently
         conducted or contemplated  makes such  qualification  necessary  except
         where a failure to be so  qualified  would not have a material  adverse
         effect on the business, assets or financial condition of the Borrowers,
         taken as a whole, or the MasTec International Group, taken as a whole.

                  (b) Authorization.  The execution, delivery and performance of
         its Loan Documents and the transactions contemplated hereby and thereby
         (i) are within the corporate authority of each of the Borrowers and the
         International  Signatories,  (ii)  have  been  duly  authorized  by all
         necessary corporate  proceedings,  (iii) do not conflict with or result
         in any  material  breach  or  contravention  of any  provision  of law,
         statute,  rule or  regulation  to which any  Borrower or  International
         Signatory is subject or any judgment, order, writ, injunction,  license
         or permit  applicable to any Borrower or International  Signatory so as
         to have a  material  adverse  effect  on the  assets,  business  or any
         activity  of such  Borrower  or  International  Signatory,  (iv) do not
         conflict with any  provision of the corporate  charter or bylaws of any
         Borrower  or  International  Signatory,  (v) do not  conflict  with any
         material  contract,  agreement  or other  instrument  binding  upon any
         Borrower or International Signatory, and (vi) will not create a lien on
         any  properties  of any of the Borrowers or  International  Signatories
         other than pursuant to the Loan Documents.

                  (c) Enforceability. The execution, delivery and performance of
         the Loan Documents will result in valid and legally binding obligations
         of the Borrowers and the International Signatories, enforceable against
         each of them in accordance  with the  respective  terms and  provisions
         hereof and thereof,  except as enforceability is limited by bankruptcy,
         insolvency,  reorganization,  moratorium  or other laws  relating to or
         affecting  generally the enforcement of creditors' rights and except to
         the extent that  availability of the remedy of specific  performance or
         injunctive  relief is subject  to the  discretion  of the court  before
         which any proceeding therefor may be brought.

     ss.5.2. Governmental Approvals. The execution,  delivery and performance by
the Borrowers and the  International  Signatories  of the Loan Documents and the
transactions  contemplated  hereby and thereby do not  require  any  approval or
consent of, or filing with,  any  governmental  agency or  authority  other than
those already obtained;  provided,  however, that the International  Signatories
shall have ninety (90) days after the date hereof to effect this provision.

     ss.5.3.   Title  to  Properties;   Leases.  Each  of  the  Parent  and  its
Subsidiaries  owns all of its respective  assets  reflected in the  consolidated
balance  sheet of the Parent as at the  Interim  Balance  Sheet Date or acquired
since that date (except property and assets sold or otherwise disposed of in the
ordinary  course  of  business  since  that  date),  subject  to  no  mortgages,
capitalized leases,  conditional sales agreements,  title retention  agreements,
liens or other encumbrances except Permitted Liens.

     ss.5.4. Financial Statements; Solvency.

                  (a)  There  has been  furnished  to the  Banks  (i)  unaudited
         consolidated financial statements of the Parent dated the Balance Sheet
         Date,  including  reconciliations  of (A) the  Borrowers and the MasTec
         International  Group  (excluding  that portion of assets,  liabilities,
         income  and  expenses  attributable  to the  Sintel  Group) and (B) the
         Sintel Group to the  consolidated  financial  statements of the Parent,
         and (ii) an  unaudited  consolidated  balance  sheet and  statement  of
         income of the Parent dated the Interim  Balance  Sheet Date,  including
         reconciliations of (A) the Borrowers (excluding that portion of assets,
         liabilities,   income  and  expenses  of  the  Parent  attributable  to
         non-Borrowers)  and (B) the  non-Borrowers to the consolidated  balance
         sheet and statement of income of the Parent. Said financial  statements
         have been prepared in accordance with GAAP (but only to the extent that
         GAAP  is  applicable  to  unaudited  reports),  fairly  present  in all
         material  respects  the  financial  condition  of the  Borrowers,  on a
         consolidated  basis,  as at the close of business on the dates  thereof
         and the results of operations  for the period then ended.  There are no
         contingent  liabilities  of the  Borrowers  as of such  date  involving
         material  amounts known to the officers of the Borrowers which have not
         been disclosed in said balance sheets and the related notes thereto, as
         the case may be.

                  (b) The Parent  (both  before and after  giving  effect to the
         transactions  contemplated  by this Agreement) is solvent (i.e., it has
         assets having a fair value in excess of the amount  required to pay its
         probable  liabilities on its existing debts as they become absolute and
         matured)  and has,  and  expects to have,  the ability to pay its debts
         from  time to time  incurred  in  connection  therewith  as such  debts
         mature.

                  (c) The  Borrowers  taken as a whole  (both  before  and after
         giving effect to the  transactions  contemplated by this Agreement) are
         solvent  (i.e.,  they have assets  having a fair value in excess of the
         amount  required to pay their  probable  liabilities  on their existing
         debts as they become  absolute  and  matured)  and have,  and expect to
         have,  the  ability to pay their  debts from time to time  incurred  in
         connection therewith as such debts mature.

     ss.5.5. No Material Changes,  Etc. Since the Balance Sheet Date, there have
occurred no material  adverse changes in the financial  condition or business of
the Borrowers as shown on or reflected in the consolidated  balance sheet of the
Parent as at the Balance Sheet Date, or the consolidated statement of income for
the fiscal year then ended other than changes  occurring in the ordinary  course
of business that in the aggregate have not had a material  adverse effect on the
business or financial  condition of the  Borrowers  taken as a whole.  Since the
Balance  Sheet Date,  no Borrower  has made any  Distribution  other than to the
Parent.

     ss.5.6.  Permits,  Franchises,   Patents,  Copyrights,  Etc.  Each  of  the
Borrowers  possesses all  franchises,  patents,  copyrights,  trademarks,  trade
names,  licenses and permits,  and rights in respect of the foregoing,  adequate
for the conduct of its business  substantially  as now  conducted  without known
conflict with any rights of others.

     ss.5.7.  Litigation.  Except as shown on Schedule 5.7 hereto,  there are no
actions,  suits,  proceedings or  investigations  of any kind pending or, to the
knowledge of the Borrowers,  threatened  against any Borrower  before any court,
tribunal or  administrative  agency or board  which,  if  adversely  determined,
might, either in any case or in the aggregate, have a material adverse effect on
the  properties,  assets,  financial  condition  or business  of the  Borrowers,
considered  as a  whole,  or  materially  impair  the  right  of the  Borrowers,
considered as a whole, to carry on business  substantially as now conducted,  or
result in any substantial liability not adequately covered by insurance,  or for
which adequate reserves are not maintained on the consolidated  balance sheet or
which  question the validity of any of the Loan Documents or any action taken or
to be taken pursuant hereto or thereto.

     ss.5.8.  No  Materially  Adverse  Contracts,  Etc. None of the Borrowers is
subject to any charter,  corporate or other legal restriction,  or any judgment,
decree,  order,  rule or  regulation  which in the  judgment  of the  Borrowers'
officers has or is expected in the future to have a material  adverse  effect on
the business,  assets or financial  condition of the Borrowers taken as a whole.
None of the  Borrowers  is a party to any  contract  or  agreement  which in the
judgment of the  Borrowers'  officers  has or is  expected to have any  material
adverse  effect on the  business of the  Borrowers  taken as a whole,  except as
otherwise reflected in adequate reserves.

     ss.5.9. Compliance With Other Instruments, Laws, Etc. None of the Borrowers
or the  International  Signatories  is  violating  any  provision of its charter
documents or by-laws or any  agreement or instrument by which any of them may be
subject or by which any of them or any of their  properties  may be bound or any
decree,  order,  judgment,  or any statute,  license,  rule or regulation,  in a
manner which could in the  aggregate  result in the  imposition  of  substantial
penalties or a material adverse effect on the financial condition, properties or
business of the Borrowers  taken as a whole,  or would impair the ability of any
Borrower or International Signatory to enter into or perform the Loan Documents.

     ss.5.10. Tax Status. The Borrowers have made or filed all federal and state
income and all other tax  returns,  reports  and  declarations  required  by any
jurisdiction to which any of them is subject (unless and only to the extent that
any Borrower has set aside on its books provisions  reasonably  adequate for the
payment of all unpaid and unreported  taxes);  and have paid all taxes and other
governmental  assessments  and charges  that are  material  in amount,  shown or
determined to be due on such  returns,  reports and  declarations,  except those
being  contested  in good faith;  and have set aside on their  books  provisions
reasonably  adequate for the payment of all taxes for periods  subsequent to the
periods to which such  returns,  reports or  declarations  apply.  Except as set
forth on Schedule 5.10, there are no unpaid taxes in any material amount claimed
to be due by the taxing authority of any  jurisdiction,  and the officers of the
Borrowers know of no basis for any such claim.

     ss.5.11.  No Event of Default.  No Default or Event of Default has occurred
and is continuing as of the date of this Agreement.

     ss.5.12. Holding Company and Investment Company Acts. None of the Borrowers
is a "holding company," or a "subsidiary  company" of a "holding company," or an
"affiliate"  of a "holding  company,"  as such  terms are  defined in the Public
Utility Holding Company Act of 1935; nor is any of them a "registered investment
company,"  or  an  "affiliated  company"  or  a  "principal  underwriter"  of  a
"registered  investment  company,"  as such terms are defined in the  Investment
Company Act of 1940, as amended.

     ss.5.13.  Absence of  Financing  Statements,  Etc.  Except with  respect to
Permitted Liens, there is no financing  statement,  security agreement,  chattel
mortgage,  real estate  mortgage or other  document  filed or recorded  with any
filing  records,  registry,  or other public  office,  which  purports to cover,
affect or give  notice of any  present or  possible  future lien on, or security
interest  in,  any  assets  or  property  of  any  of the  Borrowers  or  rights
thereunder.

     ss.5.14. Employee Benefit Plans.

                  (a) In General. Each Employee Benefit Plan and each Guaranteed
         Pension  Plan has been  maintained  and operated in  compliance  in all
         material  respects  with the  provisions  of ERISA  and,  to the extent
         applicable,  the Code,  including  but not  limited  to the  provisions
         thereunder  respecting  prohibited  transactions  and  the  bonding  of
         fiduciaries and other persons handling plan funds as required by ss.412
         of ERISA. The Borrowers have heretofore delivered to the Agent the most
         recently  completed  annual  report,   Form  5500,  with  all  required
         attachments,  and actuarial  statement  required to be submitted  under
         ss.103(d) of ERISA, with respect to each Guaranteed Pension Plan.

                  (b)  Terminability  of Welfare  Plans.  Except as set forth on
         Schedule 5.14(b), no Employee Benefit Plan which is an employee welfare
         benefit  plan  within the  meaning of ss.3(1) or  ss.3(2)(B)  of ERISA,
         provides  benefit  coverage  subsequent  to  termination  of employment
         except  as  required  by Title I, Part 6 of ERISA or  applicable  state
         insurance  laws.  Any Borrower may terminate each such Plan at any time
         (or  at  any  time  subsequent  to the  expiration  of  any  applicable
         bargaining  agreement)  in the  discretion  of  such  Borrower  without
         liability  to any  Person  other  than  for  claims  arising  prior  to
         termination.

                  (c) Guaranteed Pension Plans. Each contribution required to be
         made to a Guaranteed Pension Plan, whether required to be made to avoid
         the incurrence of an accumulated funding deficiency, the notice or lien
         provisions of ss.302(f) of ERISA,  or otherwise,  has been timely made.
         No  waiver  of  an  accumulated  funding  deficiency  or  extension  of
         amortization  periods has been received with respect to any  Guaranteed
         Pension Plan, and neither any of the Borrowers nor any ERISA  Affiliate
         is obligated to or has posted  security in connection with an amendment
         of  a  Guaranteed   Pension  Plan   pursuant  to  ss.307  of  ERISA  or
         ss.401(a)(29)  of the  Code.  No  liability  to the  PBGC  (other  than
         required  insurance  premiums,  all of which  have been  paid) has been
         incurred by any  Borrower or any ERISA  Affiliate  with  respect to any
         Guaranteed  Pension  Plan and there  has not been any ERISA  Reportable
         Event,  or any other event or condition  which presents a material risk
         of termination of any Guaranteed Pension Plan by the PBGC. Based on the
         latest  valuation of each  Guaranteed  Pension Plan (which in each case
         occurred within twelve months of the date of this representation),  and
         on the actuarial  methods and assumptions  employed for that valuation,
         the aggregate benefit  liabilities of all such Guaranteed Pension Plans
         within the  meaning  of  ss.4001 of ERISA did not exceed the  aggregate
         value of the assets of all such Guaranteed Pension Plans,  disregarding
         for this purpose the benefit  liabilities  and assets of any Guaranteed
         Pension Plan with assets in excess of benefit liabilities.

                  (d)  Multiemployer  Plans. None of the Borrowers nor any ERISA
         Affiliate  has  incurred any material  liability  (including  secondary
         liability)  to any  Multiemployer  Plan as a result  of a  complete  or
         partial  withdrawal from such Multiemployer Plan under ss.4201 of ERISA
         or as a result of a sale of assets described in ss.4204 of ERISA.  None
         of the  Borrowers  nor any ERISA  Affiliate  has been notified that any
         Multiemployer  Plan is in  reorganization  or is  insolvent  under  and
         within  the  meaning  of  ss.4241  or ss.4245 of ERISA or is at risk of
         entering   reorganization   or   becoming   insolvent,   or  that   any
         Multiemployer  Plan intends to terminate or has been  terminated  under
         ss.4041A of ERISA.

     ss.5.15.  Use of  Proceeds.  The  proceeds  of the  Loans  shall be used as
follows:  (a)  for  general  corporate  purposes;  (b)  to  repay  the  existing
indebtedness of the Borrowers;  (c) for Investments permitted pursuant to ss.7.3
hereof,  and (d) for  acquisitions  permitted  pursuant  to  ss.7.4  hereof.  No
proceeds of the Loans shall be used in any way that will violate  Regulations G,
T, U or X of the Board of Governors of the Federal Reserve System.


<PAGE>



     ss.5.16. Environmental Compliance. Except as shown on Schedule 5.16:

                  (a)  None  of  the  Borrowers,   nor  any  operator  of  their
         properties,  is in violation,  or alleged  violation,  of any judgment,
         decree,  order, law, permit,  license, rule or regulation pertaining to
         environmental  matters,  including  without  limitation,  those arising
         under RCRA, CERCLA, the Superfund Amendments and Reauthorization Act of
         1986, the Federal Clean Water Act, the Federal Clean Air Act, the Toxic
         Substances  Control  Act,  or any state or local  statute,  regulation,
         ordinance,   order  or  decree  relating  to  health,   safety  or  the
         environment (the  "Environmental  Laws"),  which violation would have a
         material adverse effect on the business,  assets or financial condition
         of the Borrowers on a consolidated basis.

                  (b) None of the Borrowers  has received  notice from any third
         party,  including,  without  limitation,  any  federal,  state or local
         governmental authority, (i) that any one of them has been identified by
         the  United  States  Environmental   Protection  Agency  ("EPA")  as  a
         potentially  responsible  party  under  CERCLA  with  respect to a site
         listed on the National  Priorities List, 40 C.F.R. Part 300 Appendix B;
         (ii) that any hazardous waste, as defined by 42 U.S.C. ss.6903(5),  any
         hazardous substances as defined by 42 U.S.C. ss.9601(14), any pollutant
         or  contaminant  as  defined  by 42  U.S.C.  ss.9601(33)  or any  toxic
         substance,  oil or hazardous materials or other chemicals or substances
         regulated by any Environmental Laws ("Hazardous  Substances") which any
         one of them has generated, transported or disposed of has been found at
         any site at which a federal, state or local agency or other third party
         has  conducted  or has  ordered  that any  Borrower  conduct a remedial
         investigation,  removal  or  other  response  action  pursuant  to  any
         Environmental Law; or (iii) that it is or shall be a named party to any
         claim,  action,  cause of action,  complaint,  legal or  administrative
         proceeding  arising  out of any  third  party's  incurrence  of  costs,
         expenses,  losses or damages of any kind  whatsoever in connection with
         the release of Hazardous Substances.

                  (c) (i) No portion of the Real  Property has been used for the
         handling,  processing,  storage or  disposal  of  Hazardous  Substances
         except in material compliance with applicable  Environmental Laws; (ii)
         in the  course  of  any  activities  conducted  by  the  Borrowers,  or
         operators  of the Real  Property,  no  Hazardous  Substances  have been
         generated  or are being  used on such  properties  except  in  material
         compliance with applicable Environmental Laws; (iii) there have been no
         unpermitted Releases or threatened Releases of Hazardous Substances on,
         upon,  into or from the Real  Property,  which  Releases  would  have a
         material  adverse effect on the value of such  properties;  (iv) to the
         best of the Borrowers' knowledge, there have been no Releases on, upon,
         from or into any real  property in the  vicinity  of the Real  Property
         which, through soil or groundwater  contamination,  may have come to be
         located on, and which would have a material adverse effect on the value
         of, such properties; and (v) in addition, any Hazardous Substances that
         have been generated on the Real Property have been transported  offsite
         only by carriers  having an  identification  number  issued by the EPA,
         treated  or  disposed  of  only by  treatment  or  disposal  facilities
         maintaining  valid permits as required under  applicable  Environmental
         Laws, which transporters and facilities,  to the best of the Borrowers'
         knowledge, have been and are operating in material compliance with such
         permits and applicable Environmental Laws.

                  (d) None of the Real  Property  is or shall be  subject to any
         applicable  environmental clean-up  responsibility law or environmental
         restrictive  transfer law or regulation,  by virtue of the transactions
         set forth herein and contemplated hereby.

     ss.5.17.  Perfection of Security Interests. Except as set forth on Schedule
5.17,  the  Collateral and the Agent's rights with respect to the Collateral are
not subject to any setoff, claims, withholdings or other defenses. The Borrowers
and MasTec  International,  Inc. are the owners of the Collateral  free from any
lien, security interest,  encumbrance and any other claim or demand,  other than
liens in  favor  of the  Agent  for the  benefit  of the  Banks  to  secure  the
Obligations. The Stock Pledge Agreements are effective to create in favor of the
Agent,  for the  benefit  of the Banks,  a legal,  valid and  enforceable  first
priority security interest in the Collateral. The certificates for the shares of
such Collateral have been delivered to the Agent; provided, however, that MasTec
International, Inc. shall have ninety (90) days after the Closing Date to effect
this  provision.  The  parties  agree  that  there  shall be no  public  filing,
registration or notice of the Sintel Stock Pledge  Agreement  unless an Event of
Default shall have occurred.

     ss.5.18.  Certain  Transactions.  Except as set forth on Schedule  5.18 and
except  for arm's  length  transactions  pursuant  to which the  Borrowers  make
payments in the ordinary  course of business upon terms no less  favorable  than
the Borrowers could obtain from third parties, none of the officers,  directors,
or employees of the Borrowers is presently a party to any  transaction  with the
Borrowers  (other  than for  services as  employees,  officers  and  directors),
including  any  contract,  agreement  or  other  arrangement  providing  for the
furnishing  of  services  to or by,  providing  for  rental of real or  personal
property to or from,  or  otherwise  requiring  payments to or from any officer,
director  or  such  employee  or,  to  the  knowledge  of  the  Borrowers,   any
corporation,  partnership, trust or other entity in which any officer, director,
or any such  employee  has a  substantial  interest or is an officer,  director,
trustee or partner.

     ss.5.19.  Subsidiaries.  Schedule 1 sets forth a complete and accurate list
of the direct or indirect Subsidiaries of the Parent, including the name of each
Subsidiary and its  jurisdiction of  incorporation,  together with the number of
authorized and outstanding  shares of each Subsidiary.  All of the stock of each
U.S.  Subsidiary (other than the Excluded  Subsidiaries) and 66% of the stock of
Sintel which is directly or  indirectly  owned by the Parent has been pledged to
the Agent on behalf of the Banks  pursuant to the Stock Pledge  Agreements.  The
Parent has good and marketable  title to all of the shares it purports to own of
the stock of each such Subsidiary,  free and clear in each case of any lien. All
such shares have been duly  issued and are fully paid and  non-assessable.  Each
Subsidiary of the Parent,  other than the Excluded  Subsidiaries and the members
of the MasTec International Group, is a Borrower hereunder.

     ss.5.20. True Copies of Charter and Other Documents.  The Borrowers and the
International Signatories have furnished the Agent copies, in each case true and
complete  as of the date  hereof,  of (a) all  charter  and other  incorporation
documents  (together with any amendments thereto) and (b) by-laws (together with
any amendments thereto);  provided,  however, that the International Signatories
shall have ninety (90) days to effect this provision as regards Sintel.

     ss.6.  AFFIRMATIVE  COVENANTS OF THE BORROWERS.  The Borrowers  jointly and
severally covenant and agree that, so long as any Loan, Reimbursement Obligation
or Note is  outstanding  or the Banks have any  obligation  to make Loans or the
Agent has any  obligation  to issue,  extend,  or renew  any  Letters  of Credit
hereunder:

     ss.6.1.  Punctual  Payment.  The Borrowers  will duly and punctually pay or
cause to be paid the  principal  and  interest on the Loans,  all fees and other
amounts  provided for in this  Agreement  and the other Loan  Documents,  all in
accordance with the terms of this Agreement and such other Loan Documents.

     ss.6.2.  Maintenance  of Office.  The Borrowers  will maintain  their chief
executive  offices  as set forth on  Schedule  1 or at such  other  place in the
United States of America as the Borrowers shall designate upon thirty (30) days'
prior written notice to the Agent.

     ss.6.3.  Records and  Accounts.  Each of the  Borrowers  will keep true and
accurate  records and books of account in which full,  true and correct  entries
will be made in accordance with GAAP and with the requirements of all regulatory
authorities,  and will  maintain  adequate  accounts  and reserves for all taxes
(including income taxes), depreciation, depletion, obsolescence and amortization
of its properties, all other contingencies, and all other proper reserves.

     ss.6.4. Financial Statements,  Certificates and Information.  The Borrowers
shall deliver to the Banks:

                  (a) as soon as  practicable,  but in any event not later  than
         fifty (50) days after the end of each fiscal  quarter of the Borrowers,
         copies of the consolidated balance sheet and statement of income of the
         Borrowers (excluding that portion of the Parent's assets,  liabilities,
         income and expenses  attributable  to  non-Borrowers)  as at the end of
         such  quarter,  subject  to  year  end  adjustments,  and  the  related
         statement  of cash  flows,  all in  reasonable  detail and  prepared in
         accordance with GAAP, with a certification  by the principal  financial
         or accounting officer of the Parent (the "CFO") that these consolidated
         financial  statements  are prepared in accordance  with GAAP and fairly
         present the consolidated financial condition of the Borrowers as at the
         close of business on the date thereof and the results of operations for
         the period then ended;

                  (b) as soon as  practicable,  but in any event not later  than
         fifty (50) days  after the end of each  fiscal  quarter of the  Parent,
         copies of the consolidated balance sheet and statement of income of the
         Parent as at the end of such quarter,  subject to year end adjustments,
         and the related  statement of cash flows, all in reasonable  detail and
         prepared in accordance with GAAP, with a certification  by the CFO that
         these consolidated financial statements are prepared in accordance with
         GAAP and fairly  present the  consolidated  financial  condition of the
         Parent as at the close of business on the date  thereof and the results
         of operations for the period then ended;

                  (c) as soon as  practicable,  but, in any event not later than
         one hundred (100) days after the end of each fiscal year of the Parent,
         the consolidated and  consolidating  balance sheets of Parent as at the
         end  of  such  year,   statements  of  cash  flows,   and  the  related
         consolidated and consolidating statements of income, each setting forth
         in comparative  form the figures for the previous fiscal year, all such
         consolidated and consolidating financial statements to be in reasonable
         detail,  prepared  in  accordance  with GAAP and,  with  respect to the
         consolidated  financial  statements,  certified  by  Coopers  & Lybrand
         L.L.P.  or another  independent  accounting  firm of national  standing
         acceptable   to  the  Agent  (the   "Accountants")   and   including  a
         reconciliation  of  the  consolidated   financial   statements  of  the
         Borrowers (excluding that portion of the Parent's assets,  liabilities,
         income and expenses  attributable to non-Borrowers) to the consolidated
         financial  statements  of  the  Parent.  In  addition,   simultaneously
         therewith,  the Borrowers  shall use their  reasonable  best efforts to
         provide the Banks with a written statement from such Accountants to the
         effect that the  Borrowers  are in  compliance  with the  covenants set
         forth in ss.8 hereof, and that, in making the examination  necessary to
         said  certification,   nothing  has  come  to  the  attention  of  such
         Accountants  that would  indicate  that any Default or Event of Default
         exists,  or, if such Accountants  shall have obtained  knowledge of any
         then existing  Default or Event of Default they shall  disclose in such
         statement  any such  Default or Event of Default;  provided,  that such
         Accountants  shall not be liable  to the  Banks for  failure  to obtain
         knowledge of any Default or Event of Default;

                  (d) as soon as  practicable,  but in any event not later  than
         thirty (30) days after the end of each fiscal quarter of the Borrowers,
         copies of the Accounts  Receivable  aging  reports of the Borrowers and
         the  consolidated  liquidity  calculation  for such date required under
         ss.8.4 hereof, all in reasonable detail and prepared in accordance with
         GAAP,  with  a  certification   by  the  CFO  that  these  reports  and
         calculation are prepared in accordance with GAAP and fairly present the
         Accounts Receivable of the Borrowers as at the close of business on the
         date thereof;

                  (e) simultaneously  with the delivery of the items referred to
         in (a), (b) and (c) above,  a statement in the form of Exhibit D hereto
         (the "Compliance  Certificate") certified by the CFO that the Borrowers
         are in  compliance  with the  covenants  contained in ss.ss.6,  7 and 8
         hereof as of the end of the  applicable  period  and  setting  forth in
         reasonable  detail  computations  evidencing such compliance,  provided
         that if the Borrowers shall at the time of issuance of such certificate
         or at any  other  time  obtain  knowledge  of any  Default  or Event of
         Default,  the Borrowers shall include in such  certificate or otherwise
         deliver forthwith to the Banks a certificate  specifying the nature and
         period of existence  thereof and what action the  Borrowers  propose to
         take with respect thereto;

                  (f) contemporaneously with, or promptly following,  the filing
         or mailing  thereof,  copies of all material  filed with the Securities
         and Exchange  Commission or sent to the  stockholders  of the Parent or
         any of the Borrowers; and

                  (g) from time to time,  such  other  financial  data and other
         information  (including  accountants'  management letters) as the Banks
         may reasonably request.

     The  Borrowers  hereby  authorize  the Banks to  disclose  any  information
obtained pursuant to this Agreement to all appropriate  governmental  regulatory
authorities where required by law; provided,  however,  that the Banks shall, to
the extent  practicable and allowable  under law, notify the Borrowers  within a
reasonable  period prior to the time any such  disclosure is made;  and provided
further,  that  this  authorization  shall  not be  deemed to be a waiver of any
rights to object to the  disclosure by the Banks of any such  information  which
any Borrower has or may have under the federal Right to Financial Privacy Act of
1978, as in effect from time to time.

     ss.6.5.  Corporate  Existence  and Conduct of  Business.  Except  where the
failure of a Borrower  to remain so  qualified  would not  materially  adversely
impair the financial  condition of the Borrowers on a consolidated  basis,  each
Borrower  will do or cause to be done all things  necessary to preserve and keep
in  full  force  and  effect  its  corporate  existence,  corporate  rights  and
franchises;   effect  and  maintain  its  foreign   qualifications,   licensing,
domestication or authorization except as terminated by its Board of Directors in
the exercise of its reasonable  judgment;  and shall not become  obligated under
any contract or binding arrangement which, at the time it was entered into would
materially  adversely  impair the  financial  condition  of the  Borrowers  on a
consolidated  basis.  Each  Borrower  will  continue to engage  primarily in the
businesses now conducted by it and in related businesses.

     ss.6.6.  Maintenance of  Properties.  The Borrowers will cause all material
properties  used or useful in the conduct of their  businesses  to be maintained
and kept in good condition,  repair and working order  (reasonable wear and tear
excepted) and supplied  with all  necessary  equipment and will cause to be made
all necessary  repairs,  renewals,  replacements,  betterments and  improvements
thereof,  all as in the judgment of the  Borrowers  may be necessary so that the
businesses carried on in connection therewith may be properly and advantageously
conducted at all times;  provided,  however,  that nothing in this section shall
prevent any Borrower from (i) discontinuing the operation and maintenance of any
of its properties if such  discontinuance  is, in the judgment of such Borrower,
desirable in the conduct of its or their  business and does not in the aggregate
have a material  adverse  effect on the business or  financial  condition of the
Borrowers  taken as a  whole,  or (ii)  conducting  a sale of  assets  permitted
pursuant to ss.7.4 hereof.

     ss.6.7.  Insurance.  The Borrowers will maintain with financially sound and
reputable insurance  companies,  funds or underwriters'  insurance of the kinds,
covering the risks (other than risks arising out of or in any way connected with
personal  liability of any officers and  directors  thereof) and in the relative
proportionate  amounts  usually  carried by  reasonable  and  prudent  companies
conducting  businesses  similar to that of the  Borrowers,  but in no event less
than the amounts and  coverages  set forth in Schedule 6.7 hereto as affected by
adjustments to retention levels in the ordinary course of business. In addition,
the  Borrowers  will  furnish  from time to time,  upon the Agent's  request,  a
summary of the insurance coverage of each of the Borrowers,  which summary shall
be in form and  substance  satisfactory  to the Agent and, if  requested  by the
Agent, will furnish to the Agent copies of the applicable policies.

     ss.6.8. Taxes. The Borrowers will each duly pay and discharge,  or cause to
be paid and  discharged,  before  the same  shall  become  overdue,  all  taxes,
assessments and other  governmental  charges (other than taxes,  assessments and
other  governmental  charges  imposed  by  foreign  jurisdictions  which  in the
aggregate are not material to the business or assets of the Borrowers taken as a
whole) imposed upon it and its real  properties,  sales and  activities,  or any
part thereof, or upon the income or profits therefrom, as well as all claims for
labor,  materials,  or  supplies,  which if unpaid might by law become a lien or
charge upon any of its property other than a Permitted Lien; provided,  however,
that any such tax,  assessment,  charge,  levy or claim  need not be paid if the
validity  or amount  thereof  shall  currently  be  contested  in good  faith by
appropriate  proceedings  and if such Borrower shall have set aside on its books
adequate  reserves  with  respect  thereto;  and  provided,  further,  that such
Borrower  will  pay all such  taxes,  assessments,  charges,  levies  or  claims
forthwith upon the  commencement  of proceedings to foreclose any lien which may
have attached as security therefor.

     ss.6.9. Inspection of Properties, Books, and Contracts. The Borrowers shall
permit the Banks,  the Agent or any of their  designated  representatives,  upon
reasonable  notice to the Parent,  to visit and inspect any of the properties of
the Borrowers,  to examine the books of account of the Borrowers  (including the
making of periodic  accounts  receivable  reviews),  or  contracts  (and to make
copies thereof and extracts therefrom), and to discuss the affairs, finances and
accounts  of the  Borrowers  with,  and to be advised  as to the same by,  their
officers, all at such times and intervals as the Banks may reasonably request.

     ss.6.10. Compliance with Laws, Contracts, Licenses and Permits; Maintenance
of  Material  Licenses  and  Permits.  Each  Borrower  will (i) comply  with the
provisions  of  its  charter  documents  and  by-laws  and  all  agreements  and
instruments by which it or any of its  properties may be bound;  and (ii) comply
with  all  applicable  laws  and  regulations  (including  Environmental  Laws),
decrees, orders, judgments, licenses and permits, including, without limitation,
all environmental permits hereto ("Applicable Laws"), except where noncompliance
in the case of (i) and (ii) above  would not have a material  adverse  effect in
the aggregate on the consolidated financial condition, properties or business of
the Borrowers  taken as a whole, or would not impair the ability of any Borrower
or  International  Signatory to enter into or perform the Loan Documents.  If at
any time while the Notes,  or any Loan or Letter of Credit is outstanding or any
Bank or the Agent has any  obligation  to make Loans or issue  Letters of Credit
hereunder,  any  authorization,  consent,  approval,  permit or license from any
officer,  agency or  instrumentality of any government shall become necessary or
required  in  order  that  any  Borrower  may  fulfill  any of  its  obligations
hereunder,  such  Borrower  will  immediately  take or  cause  to be  taken  all
reasonable steps within the power of such Borrower to obtain such authorization,
consent,  approval,  permit or  license  and  furnish  the Banks  with  evidence
thereof.

     ss.6.11.  ENVIRONMENTAL  INDEMNIFICATION.  THE BORROWERS COVENANT AND AGREE
THAT THEY WILL  INDEMNIFY  AND HOLD THE BANKS  HARMLESS FROM AND AGAINST ANY AND
ALL CLAIMS, EXPENSE,  DAMAGE, LOSS OR LIABILITY INCURRED BY THE BANKS (INCLUDING
ALL COSTS OF LEGAL  REPRESENTATION  INCURRED  BY THE BANKS)  RELATING TO (A) ANY
RELEASE OR THREATENED RELEASE OF HAZARDOUS SUBSTANCES ON THE REAL PROPERTY;  (B)
ANY VIOLATION OF ANY  ENVIRONMENTAL  LAWS WITH RESPECT TO CONDITIONS AT THE REAL
PROPERTY  OR THE  OPERATIONS  CONDUCTED  THEREON;  OR (C) THE  INVESTIGATION  OR
REMEDIATION  OF OFFSITE  LOCATIONS AT WHICH THE BORROWERS OR THEIR  PREDECESSORS
ARE ALLEGED TO HAVE DIRECTLY OR INDIRECTLY DISPOSED OF HAZARDOUS SUBSTANCES.  IT
IS EXPRESSLY ACKNOWLEDGED BY THE BORROWERS THAT THIS COVENANT OF INDEMNIFICATION
SHALL INCLUDE CLAIMS,  EXPENSE,  DAMAGE, LOSS OR LIABILITY INCURRED BY THE BANKS
BASED  UPON  THE  BANKS'  NEGLIGENCE,   AND  THIS  COVENANT  SHALL  SURVIVE  ANY
FORECLOSURE  OR ANY  MODIFICATION,  RELEASE  OR  DISCHARGE  OF THE STOCK  PLEDGE
AGREEMENTS  OR THE  PAYMENT OF THE LOANS AND SHALL  INURE TO THE  BENEFIT OF THE
BANKS, THEIR SUCCESSORS AND ASSIGNS.

     ss.6.12.  Further  Assurances.  The Borrowers will cooperate with the Banks
and execute such further instruments and documents as the Banks shall reasonably
request to carry out to the Banks' satisfaction the transactions contemplated by
this Agreement.

     ss.6.13.  Notice of Potential  Claims or  Litigation.  The Borrowers  shall
deliver to the Banks,  within 30 days of receipt thereof,  written notice of the
initiation of any action,  claim,  complaint,  or any other notice of dispute or
potential  litigation  wherein the potential  liability would be material to the
Borrowers taken as a whole under the regulations of the United States Securities
and Exchange  Commission,  together with a copy of each such notice  received by
the Parent or any of its Subsidiaries.

     ss.6.14. Notice of Default. The Borrowers will promptly notify the Banks in
writing of the  occurrence  of any  Default or Event of  Default.  If any Person
shall give any notice or take any other  action in respect of a claimed  default
(whether or not  constituting  an Event of Default)  under this Agreement or any
other note, evidence of indebtedness,  indenture or other obligation  evidencing
indebtedness  in excess of  $1,000,000  as to which any  Borrower  is a party or
obligor,  whether as principal or surety,  the Borrowers  shall  forthwith  give
written  notice  thereof to the Banks,  describing  the notice of action and the
nature of the claimed default.

     ss.7.  CERTAIN  NEGATIVE  COVENANTS OF THE BORROWERS.  The Borrowers  agree
that, so long as any Loan,  Reimbursement  Obligation or any Note is outstanding
or the Banks have any  obligation to make Loans or the Agent has any  obligation
to issue, extend or renew any Letters of Credit hereunder:

     ss.7.1.  Restrictions on Funded Debt. None of the Borrowers shall become or
be a guarantor or surety of, or otherwise create, incur, assume, or be or remain
liable, contingently or otherwise, with respect to any Funded Debt, or become or
be responsible in any manner (whether by agreement to purchase any  obligations,
stock,  assets,  goods or services,  or to supply or advance any funds,  assets,
goods or services  or  otherwise)  with  respect to any Funded Debt of any other
Person, or incur any Funded Debt other than:

                  (a)      Indebtedness to the Banks and the Agent arising under
                           this Agreement or the Loan Documents;

                  (b)      Subordinated Debt of the Parent;

                  (c) Existing Funded Debt listed on Schedule 7.1(c) hereto,  on
         the terms and conditions in effect as of the date hereof, together with
         any renewals, extensions or refinancings thereof on terms which are not
         materially  different  than  those in  effect  as of the  date  hereof;
         provided  that no more  than  $5,000,000  of such  indebtedness  may be
         prepaid without prior written consent of the Banks;

                  (d) Funded Debt incurred in connection with acquisitions after
         the  date  hereof  of any  stocks  of,  partnership  or  joint  venture
         interests  in, or assets of any  Person and owing to the  seller(s)  of
         such  stocks,  partnership  or  joint  venture  interests,  or  assets;
         provided that the  principal  amount of any such Funded Debt owed (when
         aggregated  with all such other Funded Debt permitted  pursuant to this
         ss.7.1(d)) shall not exceed $10,000,000;  and provided,  further,  that
         such acquisitions shall be otherwise permitted pursuant to ss.7.4; and

                  (e)  Other  Funded  Debt  not  to  exceed  $10,000,000  in the
         aggregate  incurred after the date hereof  (including  existing  Funded
         Debt of any Borrower  acquired pursuant to ss.7.4 hereof after the date
         hereof).

     ss.7.2.  Restrictions on Liens.  None of the Borrowers will create or incur
or suffer to be created or incurred or to exist any lien, encumbrance, mortgage,
pledge,  charge,  restriction  or other  security  interest of any kind upon any
property or assets of any character, whether now owned or hereafter acquired, or
upon the income or profits therefrom; or transfer any of such property or assets
or the income or profits therefrom for the purpose of subjecting the same to the
payment of  indebtedness  or performance of any other  obligation in priority to
payment of its  general  creditors;  or  acquire,  or agree or have an option to
acquire,  any property or assets upon  conditional sale or other title retention
or purchase money security agreement,  device or arrangement; or suffer to exist
for a period  of more than  thirty  (30) days  after  the same  shall  have been
incurred any indebtedness or claim or demand against it which if unpaid might by
law or upon  bankruptcy  or  insolvency,  or  otherwise,  be given any  priority
whatsoever  over its general  creditors;  or sell,  assign,  pledge or otherwise
transfer any accounts,  contract rights,  general  intangibles or chattel paper,
with or without recourse, except as follows (the "Permitted Liens"):

                  (a) Liens securing  Funded Debt permitted  under  ss.ss.7.1(d)
         and 7.1(e)  incurred in  connection  with the lease or  acquisition  of
         property or fixed  assets  useful or intended to be used in carrying on
         the business of the Borrowers,  provided that such Liens shall encumber
         only the  property or assets so acquired  and shall not exceed the fair
         market value thereof and provided  further that the aggregate amount of
         Funded Debt secured by such liens shall not exceed $5,000,000;

                  (b) Liens to secure taxes,  assessments  and other  government
         charges  or claims  for  labor,  material  or  supplies  in  respect of
         obligations not overdue;

                  (c) Deposits or pledges made in connection  with, or to secure
         payment of, workmen's  compensation,  unemployment  insurance,  old age
         pensions or other social security obligations;

                  (d) Liens in respect of judgments or awards which have been in
         force for less than the applicable  period for taking an appeal so long
         as  execution  is not  levied  thereunder  or in  respect  of which any
         Borrower  shall at the time in good faith be  prosecuting  an appeal or
         proceedings  for review  and in  respect  of which a stay of  execution
         shall have been  obtained  pending such appeal or review and in respect
         of which the Borrowers have maintained adequate reserves;

                  (e)   Liens   of   carriers,   warehousemen,   mechanics   and
         materialmen,  and other like liens, in existence less than  one-hundred
         and twenty  (120) days from the date of creation  thereof in respect of
         obligations not overdue;

                  (f)  Encumbrances  consisting  of  easements,  rights  of way,
         zoning  restrictions,  restrictions  on the  use of real  property  and
         defects and irregularities in the title thereto, landlord's or lessor's
         liens under  leases to which any  Borrower is a party,  and other minor
         liens or  encumbrances  none of which in the opinion of the  respective
         Borrower interferes materially with the use of the property affected in
         the ordinary conduct of the business of such Borrower, which defects do
         not  individually or in the aggregate have a material adverse effect on
         the business of such  Borrower  individually  or of the  Borrowers on a
         consolidated basis;

                  (g) Liens  (including  Liens  securing  Funded Debt  permitted
         under ss.7.1(c))  existing as of the date hereof and listed on Schedule
         7.2(g) on the terms and conditions in effect as of the date hereof;

                  (h)  Existing  Liens  in  connection  with  the  Fleet  Credit
         Agreement and the First Union mortgages,  provided that the proceeds of
         the initial Loan  advanced  hereunder  shall be used to discharge  such
         Liens;

                  (i) Liens granted pursuant to the Stock Pledge Agreements; and

                  (j) Other Liens securing  indebtedness in an aggregate  amount
not to exceed $500,000 at any time.

     ss.7.3.  Restrictions on  Investments.  None of the Borrowers shall make or
permit to exist or to remain outstanding any other Investment other than:

                  (a) marketable direct or guaranteed  obligations of the United
         States of  America  or any  agency  or  instrumentality  thereof  fully
         guaranteed  or  otherwise  fully backed by the full faith and credit of
         the United States  Government  that mature within one (1) year from the
         date of purchase by the Borrower;

                  (b)  demand   deposits,   certificates  of  deposit,   bankers
         acceptances  and time  deposits  of  United  States  banks or  Eligible
         Foreign Banks having total assets in excess of $1,000,000,000;

                  (c) securities  commonly known as "commercial paper" issued by
         a  corporation  organized  and  existing  under the laws of the  United
         States of America  or any state  thereof  that at the time of  purchase
         have been  rated and the  ratings  for which are not less than "P 1" if
         rated by Moody's Investors  Services,  Inc., and not less than "A 1" if
         rated by Standard and Poor's;

                  (d) Subject to ss.7.1 and ss.7.4, Investments by any Borrower 
in any other Borrower; and

                  (e) Investments by any Borrower in any affiliate or Subsidiary
         of a Borrower  which is not also a  Borrower  (which  may  include  the
         MasTec International Group or other non-U.S.  entities) or in any other
         Person,  provided,  however,  that the  aggregate  amount from the date
         hereof of such  Investments  outstanding  at any time  shall not exceed
         $15,000,000 plus

                           (i) the  lesser of (A) the sum of net cash  proceeds
                  received  in  connection  with the sale of the Cempresa,  S.A.
                  and Supercanal  Holding,  S.A.  investments  and the issuance 
                  of common stock of the Parent after the date hereof or
                  (B) $35,000,000;

                  plus

                           (ii) with the prior  consent of the  Majority  Banks,
                  (A) 50% of net cash proceeds  received in connection  with the
                  issuance of  Subordinated  Debt after the date hereof plus (B)
                  without  double  counting any such amounts  included in (i)(A)
                  hereof,  up to 75% of net cash proceeds received in connection
                  with the issuance of common stock of the Parent after the date
                  hereof;

provided,  however,  that the aggregate amount of (ii) hereof shall not exceed 
$100,000,000.

     Notwithstanding  (e) above, none of the Borrowers shall make any Investment
in any  Subsidiary  which is not a Borrower  hereunder  unless,  both before and
after giving effect thereto,  there does not exist a Default or Event of Default
and no  Default  or Event of  Default  would be  created  by the  making of such
Investment.

     ss.7.4.  Mergers,  Consolidations,  Sales. None of the Borrowers shall be a
party to any  merger,  consolidation  or  exchange  of  stock,  or  purchase  or
otherwise  acquire  all or  substantially  all of the assets or stock of, or any
partnership  or joint venture  interest in, any other Person except as otherwise
provided in this ss.7.4, or sell, transfer,  convey or lease any assets or group
of assets  (except  sales of equipment  tools,  parts and related  assets in the
ordinary course of business,  sales of assets totaling an aggregate amount, from
the date hereof  through the Maturity  Date,  of no more than  $10,000,000,  and
dispositions  listed  on  Schedule  7.4)  or  sell or  assign,  with or  without
recourse,  any receivables (except to another Borrower). A Borrower may purchase
or  otherwise  acquire  all or  substantially  all of the assets or stock of any
class of, or joint venture interest in, any Person provided that (a) at the time
of such  acquisition,  no  Default  or  Event of  Default  has  occurred  and is
continuing, and such acquisition will not otherwise create a Default or an Event
of Default  hereunder;  (b) the business to be acquired is  predominantly in the
same lines of  business  as the  Borrowers,  or  businesses  reasonably  related
thereto;  (c) the aggregate cash consideration to be paid in connection with any
such acquisition  (including  deferred  payments and the aggregate amount of all
Funded  Debt  assumed,  but  excluding  contingent  payments)  shall not  exceed
$10,000,000; (d) the Borrowers are in current compliance with and, giving effect
to the proposed  acquisition  (including  any  borrowings  made or to be made in
connection  therewith),  will  continue  to be in  compliance  with  all  of the
covenants  in ss.8  hereof on a pro forma  historical  combined  basis as if the
transaction  occurred on the first day of the period of measurement,  and in the
event that the aggregate cash  consideration  given in connection  with any such
acquisition  exceeds  $7,500,000,  including deferred payments and the aggregate
amount of all  liabilities  assumed,  the Banks shall have been  provided with a
Compliance Certificate demonstrating such compliance; (e) the board of directors
and (if required by applicable law) the shareholders, or the equivalent thereof,
of the business to be acquired has approved such  acquisition;  (f) the business
to be acquired operates  predominantly in the continental  United States; (g) in
the case of an asset  acquisition,  all of the  assets to be  acquired  shall be
owned by an  existing  or newly  created  Subsidiary  of the  Parent  which is a
Borrower,  all of the stock of which that is directly or indirectly owned by the
Parent has been or will be  pledged to the Agent on behalf of the Banks,  or, in
the case of a stock  acquisition,  the acquired company shall become or shall be
merged with a wholly-owned Subsidiary of the Parent which is a Borrower, 100% of
the  stock of which  has been or will be  pledged  to the Agent on behalf of the
Banks;  and (h) if such  acquisition is made by a merger,  the surviving  entity
shall be a Borrower, 100% of the stock of which shall be pledged to the Agent on
behalf of the Banks.  Any Borrower may merge with any other Borrower.

     ss.7.5.  Sale and  Leaseback.  None of the  Borrowers  shall enter into any
arrangement, directly or indirectly, whereby any Borrower shall sell or transfer
any property  owned by it in order then or  thereafter to lease such property or
lease other property which such Borrower  intends to use for  substantially  the
same  purpose as the  property  being  sold or  transferred,  without  the prior
written consent of the Banks;  other than such arrangements  which do not in the
aggregate exceed $100,000.

     ss.7.6. Restricted Distributions and Redemptions. None of the Borrowers may
make  Distributions  except as set forth in this ss.7.6.  Each Borrower may make
distributions  payable  solely  in  common  stock  or  preferred  stock  of such
Borrower,  subject  to the  requirement  to pledge all such  stock  pursuant  to
ss.5.19 hereof. Borrowers other than the Parent may declare or pay Distributions
to the Parent.  In addition,  the  Borrowers  (other than the Parent)  shall not
redeem,  convert,  retire or  otherwise  acquire  shares of any class of capital
stock of such Borrowers. The Parent may declare or pay dividends and may redeem,
convert, retire, or otherwise acquire shares of its capital stock, provided that
the aggregate  amount of all such  Distributions  by the Parent shall not exceed
50% of Consolidated Net Income in any one fiscal year. None of the Borrowers may
make any Distribution  under this ss.7.6 if a Default or Event of Default exists
or would be created by the making of such Distribution.  The Borrowers shall not
effect or permit  any  change in or  amendment  to any  document  or  instrument
pertaining  to the terms of the  Borrowers'  or the  International  Signatories'
capital  stock  other  than  the  amendment  to  the  Parent's   certificate  of
incorporation increasing the authorized amount of common stock and the par value
of the common stock and the preferred stock.

     ss.7.7.  Employee  Benefit  Plans.  None of the  Borrowers  nor  any  ERISA
Affiliate will:

                  (a) engage in any "prohibited  transaction" within the meaning
         of ss.406  of ERISA or  ss.4975  of the Code  which  could  result in a
         material liability for the Borrowers taken as a whole; or

                  (b)  permit   any   Guaranteed   Pension   Plan  to  incur  an
         "accumulated  funding deficiency," as such term is defined in ss.302 of
         ERISA, whether or not such deficiency is or may be waived; or

                  (c) fail to  contribute to any  Guaranteed  Pension Plan to an
         extent  which,  or terminate  any  Guaranteed  Pension Plan in a manner
         which,  could result in the  imposition of a lien or encumbrance on the
         assets of any Borrower pursuant to ss.302(f) or ss.4068 of ERISA; or

                  (d)  amend  any  Guaranteed   Pension  Plan  in  circumstances
         requiring  the  posting  of  security  pursuant  to  ss.307 of ERISA or
         ss.401(a)(29) of the Code; or

                  (e)  permit  or take any  action  which  would  result  in the
         aggregate benefit  liabilities (within the meaning of ss.4001 of ERISA)
         of all  Guaranteed  Pension Plans  exceeding the value of the aggregate
         assets  of such  Plans,  disregarding  for  this  purpose  the  benefit
         liabilities  and  assets  of any such  Plan  with  assets  in excess of
         benefit liabilities.

     The Borrowers will (i) promptly upon filing the same with the Department of
Labor or  Internal  Revenue  Service,  furnish  to the  Banks a copy of the most
recent actuarial statement required to be submitted under ss.103(d) of ERISA and
Annual  Report,  Form 5500,  with all required  attachments,  in respect of each
Guaranteed  Pension Plan and (ii) promptly upon receipt or dispatch,  furnish to
the Banks  any  notice,  report  or demand  sent or  received  in  respect  of a
Guaranteed  Pension Plan under ss.ss.302,  4041, 4042, 4043, 4063, 4066 and 4068
of ERISA, or in respect of a Multiemployer Plan, under ss.ss.4041A,  4202, 4219,
4242, or 4245 of ERISA.

     ss.7.8.  Negative  Pledges.  Except for Permitted  Liens,  no Borrower will
pledge any of its assets to any Person  other than to the Agent for the  benefit
of the Banks,  nor will any Borrower grant any negative  pledges on their assets
to any Person other than hereunder.

     ss.7.9.  Pledges of Stock of the Sintel Group.  So long as the Sintel Stock
Pledge Agreement or any successor  agreement has not been terminated pursuant to
ss.11  hereof,  Sintel  will not pledge any of the  capital  stock of the Sintel
Group to any Person  other than to the Agent for the  benefit of the Banks,  nor
will Sintel grant any negative  pledges on the capital stock of the Sintel Group
to any Person other than hereunder.

     ss.7.10.  Newly-Created Subsidiaries. No Borrower shall create a Subsidiary
which is not a U.S. Subsidiary.

     ss.8.  FINANCIAL  COVENANTS OF THE BORROWERS.  The Borrowers agree that, so
long as any Loan,  Reimbursement  Obligation or any Note is  outstanding  or the
Banks  have any  obligation  to make  Loans or the Agent has any  obligation  to
issue,  extend or renew any Letters of Credit hereunder,  they shall comply with
the following covenants:

     ss.8.1.  Leverage  Ratios.  As of  the  end of any  fiscal  quarter  of the
Borrowers  commencing  with the fiscal  quarter  ending March 31, 1997,  (a) the
ratio of (i) Senior Debt to (ii)  EBITDA for the period of four (4)  consecutive
fiscal quarters  ending on such date shall not exceed 2.50:1,  and (b) the ratio
of (i) Funded Debt to (ii) EBITDA for the period of four (4) consecutive  fiscal
quarters ending on such date shall not exceed 3.00:1.

     ss.8.2.  Capital Expenditures.  In any fiscal year, the Borrowers shall not
make or  commit  to  make  Capital  Expenditures  in  excess  of two  times  the
consolidated  depreciation and  amortization  expenses of the Borrowers for such
fiscal year.

     ss.8.3. Interest Coverage Ratio. As of the end of any fiscal quarter of the
Borrowers commencing with the fiscal quarter ending March 31, 1997, the ratio of
(a) EBIT for the period of four (4)  consecutive  fiscal quarters ending on such
date to (b)  Consolidated  Total  Interest  Expense for such period shall not be
less than 4.00:1.

     ss.8.4.  Liquidity.  As of the end of any fiscal  quarter of the  Borrowers
commencing  with the fiscal  quarter ending March 31, 1997, (i) the ratio of (a)
Qualified Accounts  Receivable to (b) the sum of trade payables of the Borrowers
shall not be less than  1.40:1,  and (ii) the  ratio of (a)  Qualified  Accounts
Receivable to (b) Accounts Receivable shall not be less than 0.70:1.

     ss.8.5.  Profitable Operations.  The Borrowers will not permit Consolidated
Net Income to be less than $0 for any two consecutive fiscal quarters.

     ss.9. CLOSING CONDITIONS.

     The  obligations  of the  Banks to make the  Loans  and the  Agent to issue
Letters of Credit on the  Closing  Date and  otherwise  be bound by the terms of
this  Agreement  shall be subject to the  satisfaction  of each of the following
conditions precedent:

     ss.9.1.  Corporate  Action.  All corporate  action  necessary for the valid
execution, delivery and performance by each Borrower and International Signatory
of the Loan Documents shall have been duly and effectively  taken,  and evidence
thereof  satisfactory  to the Agent  shall  have  been  provided  to the  Agent;
provided,  however,  that  Sintel  shall have ninety (90) days after the Closing
Date to effect this provision.

     ss.9.2.  Loan  Documents,  Etc. Each of the Loan Documents  shall have been
duly and properly  authorized,  executed and delivered by the respective parties
thereto  and shall be in full  force and  effect in a form  satisfactory  to the
Banks;  provided,  however,  that  Sintel  shall have ninety (90) days after the
Closing Date to effect this provision.

         ss.9.3.  Certified  Copies of Charter  Documents.  The Agent shall have
received from each of the Borrowers  and the  International  Signatories a copy,
certified by a duly authorized officer of such Person to be true and complete on
the date  hereof,  of each of (a) its charter or other  incorporation  documents
(including certificates of merger and name changes) as in effect on such date of
certification, and (b) its by-laws as in effect on such date; provided, however,
that Sintel  shall have  ninety (90) days after the Closing  Date to effect this
provision.

     ss.9.4. Incumbency Certificate. The Agent shall have received an incumbency
certificate,  dated as of the date hereof,  signed by duly  authorized  officers
giving the name and bearing a specimen signature of each individual who shall be
authorized:  (a) to sign the Loan  Documents on behalf of the  Borrowers and the
International  Signatories;  (b) to make Loan and Letter of Credit Requests; and
(c) to  give  notices  and to  take  other  action  on the  Borrowers'  and  the
International Signatories' behalf under the Loan Documents;  provided,  however,
that Sintel  shall have  ninety (90) days after the Closing  Date to effect this
provision.

     ss.9.5.  Validity of Liens.  Each of the Stock Pledge  Agreements  shall be
effective to create in favor of the Agent a legal,  valid and enforceable  first
security  interest in and lien upon the  Collateral,  subject  only to Permitted
Liens.  All filings,  recordings,  deliveries of  instruments  and other actions
necessary or desirable in the opinion of the Agent to protect and preserve  such
security interests shall have been duly effected.  The Agent shall have received
evidence  thereof in form and  substance  satisfactory  to the Agent;  provided,
however,  that the  International  Signatories shall have ninety (90) days after
the Closing Date to effect this provision.

     ss.9.6.  UCC Search  Results.  The Agent shall have received the results of
UCC  searches  with  respect to the  Borrowers  indicating  no liens  other than
Permitted Liens and otherwise in form and substance satisfactory to the Agent.

     ss.9.7.  Certificates  of  Insurance.  The Agent shall have  received (a) a
certificate of insurance from an  independent  insurance  broker dated as of the
date hereof,  or within fifteen (15) days prior thereto,  identifying  insurers,
types of insurance, insurance limits, and policy terms, and otherwise describing
the  insurance  coverage  of the  Borrowers  and  (b)  copies  of  all  policies
evidencing such insurance (or certificates  therefor signed by the insurer or an
agent authorized to bind the insurer).

     ss.9.8.  Opinion of Counsel.  The Banks shall have received favorable legal
opinions from general counsel to the Borrowers, addressed to the Banks, dated as
of the date hereof,  in form and substance  satisfactory to the Agent.  Opinions
satisfactory  to the Agent  regarding the Sintel Stock Pledge  Agreement and the
International Pledge Documents (defined therein) shall be received within ninety
(90) days of the date hereof.

     ss.9.9. Certificate of Financial Condition. The Agent shall have received a
certificate  from the CFO  satisfactory to the Agent certifying that no material
adverse change has occurred in the financial  condition,  results of operations,
business,  properties or prospects of the Borrowers, taken as a whole, since the
date of the most recent  financial  statements and  projections  provided to the
Banks.

     ss.9.10.  Initial Compliance  Certificate.  The Agent shall have received a
Compliance Certificate regarding compliance with the covenants set forth in ss.8
hereof as of the Closing Date.

     ss.9.11. Interim Balance Sheets and Income Statements. The Agent shall have
received an unaudited  consolidated balance sheet and statement of income of the
Parent dated the Interim Balance Sheet Date,  including  reconciliations  of (A)
the  Borrowers  (excluding  that  portion  of  assets,  liabilities,  income and
expenses of the Parent  attributable to non-Borrowers) and (B) the non-Borrowers
to the consolidated  balance sheet and statement of income of the Parent,  which
balance sheet and statement of income shall be attached hereto as Schedule 9.11.

     ss.9.12.  Payoff Letters. The Banks shall have received payoff letters from
Fleet Financial Corporation ("Fleet") with respect to the Fleet Credit Agreement
and from First Union regarding its mortgages indicating the amount to be paid to
such lenders on the Closing Date in order to fully discharge such obligations to
the  lenders  and  acknowledging  that  upon  receipt  of such  funds  each will
forthwith execute and deliver to the Agent for filing all termination statements
and take such other  actions as may be necessary to discharge  all mortgages and
security interests in favor of such lender.

     ss.10. CONDITIONS OF ALL LOANS.

     The obligations of the Banks to make any Loan (including without limitation
the  obligation of the Agent to issue any Letter of Credit) on and subsequent to
the Closing Date is subject to the following conditions precedent:

     ss.10.1.   Representations   True;  No  Event  of  Default.   Each  of  the
representations  and warranties of the Borrowers  contained in this Agreement or
in any document or instrument  delivered  pursuant to or in connection with this
Agreement shall be true as of the date as of which they were made and shall also
be true at and as of the time of any  Drawdown  Date with the same  effect as if
made at and as of that time  (except  to the extent of  changes  resulting  from
transactions  contemplated or permitted by this Agreement and changes  occurring
in the  ordinary  course of business  which singly or in the  aggregate  are not
materially  adverse,  or to the extent that such  representations and warranties
relate  expressly to an earlier  date) and no Default or Event of Default  shall
have occurred and be continuing.

     ss.10.2.  Performance;  No Event  of  Default.  The  Borrowers  shall  have
performed  and  complied  with all terms and  conditions  herein  required to be
performed or complied  with by them prior to or at the time of any Loan,  and at
the time of any Loan,  there shall exist no Event of Default or condition  which
would result in an Event of Default upon  consummation  of such Loan  (including
without  limitation  any  amounts to be drawn  under a Letter of  Credit).  Each
request by the Borrowers for a Loan (including  without  limitation each request
for  issuance  of a  Letter  of  Credit)  subsequent  to the  first  Loan  shall
constitute  certification  by the  Borrowers  that the  conditions  specified in
ss.ss.10.1 and 10.2 will be duly satisfied on the date of such Loan or Letter of
Credit issuance.

     ss.10.3.  No Legal Impediment.  No change shall have occurred in any law or
regulations  thereunder  or  interpretations  thereof  which  in the  reasonable
opinion  of the  Banks  would  make it  illegal  for  the  Banks  to make  Loans
hereunder.

     ss.10.4.  Governmental  Regulation.  The Banks  shall  have  received  such
statements in substance and form  reasonably  satisfactory  to the Banks as they
shall require for the purpose of compliance  with any applicable  regulations of
the Comptroller of the Currency or the Board of Governors of the Federal Reserve
System.

     ss.10.5.  Proceedings and Documents. All proceedings in connection with the
transactions  contemplated by this Agreement and all documents  incident thereto
shall  have  been  delivered  to the  Banks  as of the date  hereof  in form and
substance  satisfactory to the Banks,  including without  limitation a Letter of
Credit and Loan Request in the form attached  hereto as Exhibit C, and the Banks
shall have received all information and such counterpart  originals or certified
or other copies of such documents as the Banks may reasonably request.

     ss.11. COLLATERAL SECURITY. The Obligations shall be secured by a perfected
security  interest  (having,  with respect to each category of  Collateral,  the
respective  rights  and  priorities  set forth  herein  and in the Stock  Pledge
Agreements) in all of the Collateral,  whether now owned or hereafter  acquired,
pursuant to the terms of the Stock Pledge Agreements.  However, provided that no
Default or Event of Default  has  occurred  and is  continuing,  the Agent shall
release  the stock of Sintel  and the  Sintel  Stock  Pledge  Agreement  (or any
successor  agreement)  shall  terminate,  if such release and  termination  is a
required  condition of refinancing  the  indebtedness of Sintel or its immediate
parent (including,  without  limitation,  refinancing  existing  indebtedness to
Telefonica),  provided that the Agent consents to the terms of such refinancing,
which consent shall not be unreasonably withheld.

     ss.12. EVENTS OF DEFAULT; ACCELERATION; TERMINATION OF COMMITMENT.

     ss.12.1. Events of Default and Acceleration. If any of the following events
("Events of Default" or, if the giving of notice or the lapse of time or both is
required,  then,  prior to such notice and/or lapse of time,  "Defaults")  shall
occur:

                  (a) the Borrowers shall fail to pay any principal of the Loans
         or any  Reimbursement  Obligations  when the same shall  become due and
         payable,  whether  at the  Maturity  Date  or any  accelerated  date of
         maturity or at any other date fixed for payment;

                  (b) the  Borrowers  shall fail to pay any  interest or fees or
         other amounts owing  hereunder  within five (5) Business Days after the
         same shall become due and payable  whether at the Maturity  Date or any
         accelerated date of maturity or at any other date fixed for payment;

                  (c)      the Borrowers shall fail to comply with the covenants
         contained inss.ss.6.3, 6.5, 6.7, 6.9, 6.13, 6.14, 7 or 8 hereof;

                  (d)      the  Borrowers shall fail to comply with the 
         covenants  contained inss.ss.6.4 or 6.10 hereof and such failure shall
         be continuing for ten (10) days;

                  (e) the Borrowers shall fail to perform any term,  covenant or
         agreement contained herein or in any of the other Loan Documents (other
         than those specified in subsections (a), (b), (c) and (d) above) within
         thirty (30) days after written notice of such failure has been given to
         the Borrowers by the Banks;

                  (f) any representation or warranty contained in this Agreement
         or in any document or instrument delivered pursuant to or in connection
         with this  Agreement  shall  prove to have been  false in any  material
         respect upon the date when made or repeated;

                  (g) any Borrower shall fail to pay at maturity,  or within any
         applicable  period of grace,  any and all  obligations  for Funded Debt
         (other than the  Obligations)  or any Guarantee with respect thereto in
         an  aggregate  amount  greater than  $1,000,000,  or fail to observe or
         perform any  material  term,  covenant or  agreement  contained  in any
         agreement by which it is bound,  evidencing or securing  borrowed money
         in an aggregate  amount greater than $1,000,000 for such period of time
         as would,  or would have permitted  (assuming the giving of appropriate
         notice if required) the holder or holders thereof or of any obligations
         issued thereunder to accelerate the maturity thereof;

                  (h) (i) any Borrower  makes an  assignment  for the benefit of
         creditors, or admits in writing its inability to pay or generally fails
         to pay its debts as they mature or become due, or  petitions or applies
         for the  appointment  of a trustee or other  custodian,  liquidator  or
         receiver of any  Borrower or of any  substantial  part of the assets of
         any Borrower or commences any case or other proceeding  relating to any
         Borrower under any bankruptcy, reorganization, arrangement, insolvency,
         readjustment of debt,  dissolution or liquidation or similar law of any
         jurisdiction,  now or  hereafter  in  effect,  or takes  any  action to
         authorize or in  furtherance  of any of the  foregoing  (other than the
         dissolution of Subsidiaries  with assets,  liabilities and projected or
         anticipated  revenues  of less than (in each such case)  $100,000);  or
         (ii) any such  petition  or  application  is filed or any such  case or
         other proceeding is commenced  against any Borrower and or any Borrower
         indicates  its  approval  thereof,   consent  thereto  or  acquiescence
         therein;

                  (i) a decree or order is entered  appointing any such trustee,
         custodian, liquidator or receiver or adjudicating any Borrower bankrupt
         or  insolvent,  or  approving  a  petition  in any  such  case or other
         proceeding,  or a decree or order for  relief is  entered in respect of
         any Borrower in an involuntary  case under federal  bankruptcy  laws as
         now or  hereafter  constituted,  and such  decree or order  remains  in
         effect for more than sixty (60) days, whether or not consecutive;

                  (j) there shall remain in force, undischarged, unsatisfied and
         unstayed,  for more than thirty (30) days,  whether or not consecutive,
         any final judgment against any Borrower which,  with other  outstanding
         final  judgments  against  any  Borrower,   exceeds  in  the  aggregate
         $1,000,000 after taking into account any undisputed insurance coverage;

                  (k) any Borrower or any ERISA  Affiliate  incurs any liability
         to the PBGC or a Guaranteed  Pension Plan pursuant to Title IV of ERISA
         in an aggregate amount exceeding $1,000,000;  any Borrower or any ERISA
         Affiliate  is  assessed  withdrawal  liability  pursuant to Title IV of
         ERISA by a  Multiemployer  Plan  requiring  aggregate  annual  payments
         exceeding $1,000,000,  or any of the following occurs with respect to a
         Guaranteed Pension Plan: (i) an ERISA Reportable Event, or a failure to
         make a required  installment  or other  payment  (within the meaning of
         ss.302(f)(1) of ERISA), provided the Agent determines in its reasonable
         discretion that such event (A) could be expected to result in liability
         of  such  Borrower  to the  PBGC  or the  Plan  in an  agregate  amount
         exceeding   $1,000,000  and  (B)  could  constitute   grounds  for  the
         termination  of such  Plan by the  PBGC,  for  the  appointment  by the
         appropriate  United  States  District  Court of a trustee to administer
         such Plan or for the  imposition  of a lien in favor of the  Guaranteed
         Pension Plan; (ii) the appointment by a United States District Court of
         a trustee to administer such Plan; or (iii) the institution by the PBGC
         of proceedings to terminate such Plan;

                  (l) any of the Loan Documents shall be cancelled,  terminated,
         revoked  or  rescinded  otherwise  than in  accordance  with the  terms
         thereof  or with  the  express  prior  written  agreement,  consent  or
         approval of the Banks, or any action at law, suit or in equity or other
         legal proceeding to cancel, revoke or rescind any of the Loan Documents
         shall be  commenced  by or on behalf of the  Borrowers  or any of their
         respective  stockholders,  or any  court or any other  governmental  or
         regulatory  authority or agency of competent  jurisdiction shall make a
         determination that, or issue a judgment, order, decree or ruling to the
         effect that, any one or more of the Loan Documents is illegal,  invalid
         or unenforceable in accordance with the terms thereof; or

                  (m) (i) any person or group of persons  (within the meaning of
         Section 13 or 14 of the  Securities  Exchange Act of 1934,  as amended)
         shall have acquired  beneficial  ownership  (within the meaning of Rule
         13d-3 promulgated by the Securities and Exchange  Commission under said
         Act) of 20% or more of the  outstanding  shares of common  stock of the
         Parent,  or (ii) members of the Jorge L. Mas family cease to own 30% or
         more of the common  stock of the Parent;  or (iii) during any period of
         twelve consecutive  calendar months,  individuals who were directors of
         the Parent on the first day of such period shall cease to  constitute a
         majority of the Board of Directors of the Parent unless the replacement
         directors were nominated by the original directors;

then, and in any such event,  so long as the same may be  continuing,  the Agent
may and,  upon the  request  of the  Banks,  shall,  by notice in writing to the
Borrowers,  declare all amounts owing with respect to this Agreement,  the Notes
and the other Loan Documents and all  Reimbursement  Obligations to be, and they
shall  thereupon   forthwith   become,   immediately  due  and  payable  without
presentment,  demand,  protest  or other  notice of any  kind,  all of which are
hereby  expressly  waived by the  Borrowers;  provided that, in the event of any
Bankruptcy  Event,  all such amounts  shall become  immediately  due and payable
automatically  and without any requirement of notice from the Agent or any Bank.
Upon  demand by the Banks  after the  occurrence  of any Event of  Default,  the
Borrowers shall immediately  provide to the Agent cash in an amount equal to the
aggregate  Maximum  Drawing  Amount of all  Letters of Credit and  Reimbursement
Obligations outstanding,  to be held by the Agent as collateral security for the
Obligations.

     ss.12.2.  Termination of Commitments.  If any Event of Default shall occur,
any unused portion of the Total Commitment  hereunder shall forthwith  terminate
and the Banks shall be relieved of all further  obligations to make Loans to the
Borrowers  and the Agent shall be relieved of all further  obligations  to issue
Letters of Credit;  or if on any Drawdown Date the  conditions  precedent to the
making  of the Loans to be made on such  Drawdown  Date or the  issuance  of any
Letters  of Credit to be issued  on such  date are not  satisfied  (except  as a
consequence  of a default on the part of the Banks),  the Banks may by notice to
the Borrowers,  terminate the unused portion of the Total Commitment  hereunder,
and upon such Notice being given,  such unused  portion of the Total  Commitment
hereunder  shall  terminate  immediately  and the Banks shall be relieved of all
further  obligations  to make  Loans to the  Borrowers  and the  Agent  shall be
relieved of all further obligations to issue, extend or renew Letters of Credit.
No termination of any portion of the Total  Commitment  hereunder  shall relieve
the Borrowers of any of the Obligations.

     ss.12.3.  Remedies.  Subject  to  ss.14.8,  in case  any one or more of the
Events of Default shall have occurred and be continuing,  and whether or not the
Banks shall have accelerated the maturity of the Loans pursuant to ss.12.1, each
Bank,  if owed  any  amount  with  respect  to the  Loans  or the  Reimbursement
Obligations,  may,  with the consent of the  Majority  Banks but not  otherwise,
proceed to protect and  enforce  its rights by suit in equity,  action at law or
other  appropriate  proceeding,  whether  for the  specific  performance  of any
covenant or agreement  contained in this  Agreement and the other Loan Documents
or any instrument  pursuant to which the Obligations to such Bank are evidenced,
including,  without limitation,  as permitted by applicable law the obtaining of
the ex parte  appointment  of a receiver,  and, if such amount shall have become
due, by declaration or otherwise,  proceed to enforce the payment thereof or any
legal or equitable right of such Bank. No remedy herein  conferred upon any Bank
or the Agent or the  holder  of any Note or  purchaser  of any  Letter of Credit
Participation is intended to be exclusive of any other remedy and each and every
remedy shall be cumulative  and shall be in addition to every other remedy given
hereunder or now or hereafter  existing at law or in equity or by statute or any
other provision of law.

     ss.13.  SETOFF.  Regardless of the adequacy of any  collateral,  during the
continuance  of an Event of Default,  any deposits or other sums  credited by or
due from any Bank to the Borrowers and any  securities or other  property of the
Borrowers  in the  possession  of such Bank may be applied to or set off against
the  payment of the  Obligations  and any and all other  liabilities,  direct or
indirect,  absolute  or  contingent,  due or to  become  due,  now  existing  or
hereafter  arising,  of the  Borrowers to the Banks.  Such Bank shall notify the
Parent and the other Banks of such application or setoff.  The Banks agree among
themselves  that, if a Bank shall obtain payment on any Obligations  outstanding
under this Agreement through the exercise of a right of offset, banker's lien or
counterclaim,  or  from  any  other  source  (other  than  by way of a pro  rata
payment),  it shall promptly notify the Agent thereof and make such  adjustments
with the other Banks as shall be  equitable  to the end that all the Banks shall
share the benefits of such  payments pro rata in  accordance  with the aggregate
unpaid  amount of the Notes held by each Bank  immediately  prior to the payment
obtained by such Bank as aforesaid.  The Banks  further  agree among  themselves
that if any payment to a Bank  obtained by such Bank  through the  exercise of a
right of offset, banker's lien or counterclaim,  or from any other source (other
than by way of a pro rata  payment)  as  aforesaid  shall be  rescinded  or must
otherwise  be  restored,  the Banks who shall have  shared  the  benefit of such
payment shall return their share of that benefit to the Bank whose payment shall
have been rescinded or otherwise restored.

     ss.14. THE AGENT.

     ss.14.1.  Appointment  of Agent,  Powers and  Immunities.  Each Bank hereby
irrevocably  appoints and authorizes the Agent to act as its agent hereunder and
under  the  other  Loan  Documents,  provided,  however,  the  Agent  is  hereby
authorized to serve only as an administrative and collateral agent for the Banks
and to exercise such powers as are reasonably  incidental thereto and as are set
forth  in  this  Agreement  and the  other  Loan  Documents.  The  Agent  hereby
acknowledges  that it does not have the  authority  to negotiate  any  agreement
which would bind the Banks or agree to any amendment,  waiver or modification of
any of the  Loan  Documents  or bind  the  Banks  except  as set  forth  in this
Agreement or the Loan Documents. Except as provided herein and in the other Loan
Documents,  the  Agent  shall  take  action or  refrain  from  acting  only upon
instructions  of the Banks and no action  taken or  failure to act  without  the
consent of the Banks shall be binding on any Bank which has not consented.  Each
Bank irrevocably authorizes the Agent to execute the Stock Pledge Agreements and
all other instruments relating thereto and to take such action on behalf of each
of the Banks and to exercise all such powers as are  expressly  delegated to the
Agent under the Loan  Documents  and all related  documents,  together with such
other powers as are reasonably incidental thereto. It is agreed that the duties,
rights,  privileges  and  immunities of the Agent,  in its capacity as issuer of
Letters  of  Credit  hereunder,  shall  be  identical  to  its  duties,  rights,
privileges and  immunities as a Bank as provided in this ss.14.  The Agent shall
not  have  any  duties,  obligations  or  responsibilities,   or  any  fiduciary
relationship  with any Bank,  except those expressly set forth in this Agreement
and the other Loan Documents.  Without limiting the generality of the foregoing,
the Agent shall not be  required to take any action with  respect to any Default
or Event of Default,  except as expressly  provided in ss.12.  Neither the Agent
nor any of its  affiliates  shall be  responsible to the Banks for any recitals,
statements,  representations  or  warranties  made by the Borrowers or any other
Person  whether  contained  herein  or  otherwise  or for the  value,  validity,
effectiveness, genuineness, enforceability or sufficiency of this Agreement, the
other Loan Documents or any other document referred to or provided for herein or
therein or for any failure by the  Borrowers  or any other Person to perform its
obligations  hereunder or thereunder  or in respect of the Notes.  The Agent may
employ  agents  and  attorneys-in-fact  and  shall  not be  responsible  for the
negligence or misconduct of any such agents or attorneys-in-fact  selected by it
with  reasonable  care.  Neither the Agent nor any of its  directors,  officers,
employees or agents shall be  responsible  for any action taken or omitted to be
taken in good faith by it or them  hereunder or in connection  herewith,  except
for its or their own gross  negligence or willful  misconduct.  The Agent in its
separate  capacity as a Bank shall have the same rights and powers  hereunder as
any other Bank.

         ss.14.2.  Actions  By Agent.  The  Agent  shall be fully  justified  in
failing or refusing to take any action  under this  Agreement  as it  reasonably
deems appropriate unless it shall first have received such advice or concurrence
of the Banks and shall be  indemnified  to its  reasonable  satisfaction  by the
Banks  against any and all  liability and expense which may be incurred by it by
reason of taking or continuing  to take any such action.  The Agent shall in all
cases be fully  protected in acting,  or in refraining  from acting,  under this
Agreement  or any of the Loan  Documents  in  accordance  with a request  of the
Banks,  and such request and any action taken or failure to act pursuant thereto
shall be  binding  upon the Banks  and all  future  holders  of the Notes or any
Letter of Credit Participation.

     ss.14.3. INDEMNIFICATION. WITHOUT LIMITING THE OBLIGATIONS OF THE BORROWERS
HEREUNDER OR UNDER ANY OTHER LOAN  DOCUMENTS,  THE BANKS AGREE TO INDEMNIFY  THE
AGENT, RATABLY IN ACCORDANCE WITH THEIR RESPECTIVE COMMITMENT  PERCENTAGES,  FOR
ANY AND ALL  LIABILITIES,  OBLIGATIONS,  LOSSES,  DAMAGES,  PENALTIES,  ACTIONS,
JUDGMENTS,  SUITS,  COSTS,  EXPENSES  OR  DISBURSEMENTS  OF ANY  KIND OR  NATURE
WHATSOEVER  (OTHER THAN LOSSES WITH RESPECT TO THE AGENT'S PRO RATA SHARE OF THE
OBLIGATIONS)  WHICH HAVE NOT BEEN  REIMBURSED  BY THE BORROWERS AND WHICH MAY AT
ANY TIME BE IMPOSED ON,  INCURRED  BY OR  ASSERTED  AGAINST THE AGENT IN ANY WAY
RELATING TO OR ARISING OUT OF THIS  AGREEMENT OR ANY OTHER LOAN  DOCUMENT OR ANY
DOCUMENTS  CONTEMPLATED BY OR REFERRED TO HEREIN OR THEREIN OR THE  TRANSACTIONS
CONTEMPLATED  HEREBY OR THEREBY OR THE ENFORCEMENT OF ANY OF THE TERMS HEREOF OR
THEREOF OR OF ANY SUCH OTHER DOCUMENTS;  PROVIDED,  THAT NO BANK SHALL BE LIABLE
FOR ANY OF THE  FOREGOING TO THE EXTENT THEY ARISE FROM THE GROSS  NEGLIGENCE OR
WILLFUL  MISCONDUCT OF THE AGENT (OR ANY AGENT THEREOF),  IT BEING THE INTENT OF
THE PARTIES HERETO THAT ALL SUCH  INDEMNIFIED  PARTIES SHALL BE INDEMNIFIED  FOR
THEIR ORDINARY SOLE OR CONTRIBUTORY NEGLIGENCE.

     ss.14.4.  Reimbursement.  Without  limiting the provisions of ss.14.3,  the
Banks and the Agent  hereby  agree  that the Agent  shall not be obliged to make
available  to any Person any sum which the Agent is expecting to receive for the
account of that Person until the Agent has determined  that it has received that
sum. The Agent may,  however,  disburse funds prior to determining that the sums
which the Agent expects to receive have been finally and unconditionally paid to
the Agent,  if the Agent  wishes to do so. If and to the  extent  that the Agent
does disburse  funds and it later  becomes  apparent that the Agent did not then
receive a payment  in an amount  equal to the sum paid out,  then any  Person to
whom the Agent made the funds available shall, on demand from the Agent,  refund
to the Agent the sum paid to that Person.  If, in the opinion of the Agent,  the
distribution  of any amount  received by it in such capacity  hereunder or under
the Loan  Documents  might involve it in  liability,  it may refrain from making
distribution until its right to make distribution shall have been adjudicated by
a court of competent  jurisdiction.  If a court of competent  jurisdiction shall
adjudge that any amount  received and  distributed by the Agent is to be repaid,
each  Person to whom any such  distribution  shall have been made  shall  either
repay to the Agent its  proportionate  share of the  amount  so  adjudged  to be
repaid or shall pay over the same in such manner and to such Persons as shall be
determined by such court.

     ss.14.5. Documents. The Agent will forward to each Bank, promptly after the
Agent's receipt  thereof,  a copy of each notice or other document  furnished to
the Agent for such Bank hereunder;  provided, however, that, notwithstanding the
foregoing,  the Agent may furnish to the Banks a monthly summary with respect to
Letters of Credit  issued  hereunder in lieu of copies of the related  Letter of
Credit Applications.

     ss.14.6.  Non-Reliance on Agent and Other Banks.  Each Bank represents that
it has,  independently  and without reliance on the Agent or any other Bank, and
based on such documents and information as it has deemed  appropriate,  made its
own  appraisal  of the  financial  condition  and affairs of the  Borrowers  and
decision to enter into this  Agreement  and the other Loan  Documents and agrees
that it will,  independently  and without  reliance  upon the Agent or any other
Bank, and based on such documents and  information as it shall deem  appropriate
at the time,  continue to make its own appraisals and decisions in taking or not
taking action under this Agreement or any other Loan  Document.  The Agent shall
not be required to keep  informed as to the  performance  or  observance  by the
Borrowers of this  Agreement,  the other Loan  Documents  or any other  document
referred  to or  provided  for herein or  therein or by any other  Person of any
other agreement or to make inquiry of, or to inspect the properties or books of,
any Person.  Except for notices,  reports and other  documents  and  information
expressly  required to be  furnished  to the Banks by the Agent  hereunder,  the
Agent  shall not have any duty or  responsibility  to provide  any Bank with any
credit  or other  information  concerning  any  person  which  may come into the
possession of the Agent or any of its affiliates. Each Bank shall have access to
all documents  relating to the Agent's  performance  of its duties  hereunder at
such Bank's  request.  Unless any Bank shall promptly object to any action taken
by the Agent  hereunder  (other than actions to which the  provisions of ss.14.8
are  applicable  and other than actions  which  constitute  gross  negligence or
willful  misconduct by the Agent),  such Bank shall  conclusively be presumed to
have approved the same.

     ss.14.7.  Resignation of Agent.  The Agent may resign at any time by giving
60 days' prior written notice  thereof to the Banks and the Borrowers.  Upon any
such  resignation,  the Banks shall have the right to appoint a successor Agent.
If no  successor  Agent shall have been so appointed by the Banks and shall have
accepted such  appointment  within 30 days after the retiring  Agent's giving of
notice of  resignation,  then the  retiring  Agent may,  on behalf of the Banks,
appoint a  successor  Agent,  which shall be a  financial  institution  having a
combined capital and surplus in excess of  $150,000,000.  Upon the acceptance of
any  appointment as Agent hereunder by a successor  Agent,  such successor Agent
shall  thereupon  succeed  to and become  vested  with all the  rights,  powers,
privileges  and duties of the retiring  Agent,  and the retiring  Agent shall be
discharged from its duties and obligations hereunder. After any retiring Agent's
resignation,  the provisions of this Agreement  shall continue in effect for its
benefit in respect  of any  actions  taken or omitted to be taken by it while it
was acting as Agent.  Any new Agent  appointed  pursuant to this  ss.14.7  shall
immediately issue new Letters of Credit in place of Letters of Credit previously
issued by the Agent.

     ss.14.8. Action by the Banks, Consents, Amendments, Waivers, Etc. Except as
otherwise expressly provided in this ss.14.8,  any action to be taken (including
the  giving of  notice)  may be taken or any  consent or  approval  required  or
permitted by the  Agreement or any other Loan  Document to be given by the Banks
may be given,  and any term of this  Agreement,  any other Loan  Document or any
other  instrument,  document or agreement related to this Agreement or the other
Loan  Documents  or  mentioned  therein  may be amended and the  performance  or
observance  by the Borrowers or any other person of any of the terms thereof and
any  Default or Event of  Default  (as  defined  in any of the  above-referenced
documents or  instruments)  may be waived  (either  generally or in a particular
instance  and  either  retroactively  or  prospectively)  only with the  written
consent  of the  Majority  Banks;  provided,  however,  that no such  consent or
amendment  which affects the rights,  duties or liabilities of the Agent (in its
capacity as Agent) shall be effective  without the written consent of the Agent.
Notwithstanding the foregoing,  no amendment,  waiver or consent shall do any of
the following unless in writing and signed by ALL of the Banks: (a) increase the
principal amount of the Total Commitment (or subject the Banks to any additional
obligations),  (b) reduce the principal of or interest on the Notes  (including,
without  limitation,  interest on overdue  amounts) or any fees or other amounts
payable  hereunder,  (c)  postpone  any date fixed for any payment in respect of
principal  or  interest  or  Reimbursement   Obligations   (including,   without
limitation,  interest  on overdue  amounts)  on the Notes,  or any fees or other
amounts  payable  hereunder;  (d)  extend the  expiration  date of any Letter of
Credit beyond the Maturity Date,  (e) change the definition of "Majority  Banks"
or number of Banks which shall be required  for the Banks or any of them to take
any action  under the Loan  Documents;  (f) amend this  ss.14.8;  (g) change the
Commitment  Percentage of any Bank,  except as permitted under ss.17 hereof;  or
(h) except as otherwise permitted in ss.11 hereof, release any Collateral.



<PAGE>



     ss.15. EXPENSES.

     The  Borrowers  agree to pay (a) any  taxes  (including  any  interest  and
penalties  in respect  thereto)  payable by the Agent or any of the Banks (other
than Income Taxes) on or with respect to the  transactions  contemplated by this
Agreement  (the Borrowers  hereby  agreeing to indemnify the Agent and each Bank
with respect  thereto),  (b) the reasonable fees,  expenses and disbursements of
the  Agent's  Special  Counsel  or any local  counsel to the Agent  incurred  in
connection with the preparation,  administration  or  interpretation of the Loan
Documents and other instruments  mentioned herein,  each closing hereunder,  and
amendments,  modifications,  approvals, consents or waivers hereto or hereunder,
(c) the fees,  expenses and  disbursements of the Agent incurred by the Agent in
connection with the preparation,  administration  or  interpretation of the Loan
Documents  and  other  instruments   mentioned  herein,   including  all  credit
examination fees, (d) all reasonable  out-of-pocket  expenses (including without
limitation  reasonable  attorneys'  fees  and  costs,  which  attorneys  may  be
employees  of any Bank or the  Agent,  and  reasonable  consulting,  accounting,
appraisal,  investment  banking  and  similar  professional  fees  and  charges)
incurred by any Bank or the Agent in connection  with (i) the  enforcement of or
preservation of rights under any of the Loan Documents  against the Borrowers or
the administration thereof after the occurrence of a Default or Event of Default
and (ii) any  litigation,  proceeding or dispute  whether  arising  hereunder or
otherwise, in any way related to any Bank's or the Agent's relationship with the
Borrowers.  In addition,  the Borrowers  agree to pay and save the Agent and the
Banks harmless against any liability for payment of any state  documentary stamp
taxes,  intangible taxes or similar taxes (including  interest or penalties,  if
any) which may now or  hereafter be  determined  to be payable in respect to the
execution,  delivery  or  recording  of any Loan  Document or the funding of any
Loan, whether originally thought to be due or not, and regardless of any mistake
of fact or law on the part of the Agent, the Banks or the Borrowers with respect
to the  applicability  of such tax. The  covenants  of this ss.15 shall  survive
payment or satisfaction of all other Obligations.

     ss.16.  SURVIVAL OF COVENANTS,  ETC. Unless  otherwise  stated herein,  all
covenants, agreements,  representations and warranties made herein, in the other
Loan Documents or in any documents or other papers  delivered by or on behalf of
the  Borrowers  pursuant  hereto shall be deemed to have been relied upon by the
Banks and the Agent,  notwithstanding any investigation  heretofore or hereafter
made by any of them, and shall survive the making of the Loans and the issuance,
extension or renewal of any Letters of Credit, as herein contemplated, and shall
continue  in full  force  and  effect  so  long as any  amount  due  under  this
Agreement,  any Letter of Credit or the Notes remains  outstanding and unpaid or
any Bank has any obligation to make any Loans or the Agent has any obligation to
issue  any  Letters  of  Credit  hereunder.  All  statements  contained  in  any
certificate or other paper  delivered by or on behalf of the Borrowers  pursuant
hereto  or  in  connection  with  the  transactions  contemplated  hereby  shall
constitute representations and warranties by the Borrowers hereunder.

     ss.17. ASSIGNMENT AND PARTICIPATION.  It is understood and agreed that each
Bank  shall  have the  right to  assign  at any  time  all or a  portion  of its
Commitment  Percentage  and  interests  in  the  risk  relating  to  the  Loans,
outstanding  Letters of Credit, and its Commitment  hereunder in an amount equal
to or greater than $5,000,000  (which assignment shall be of an equal percentage
of the Commitment,  the Loans and outstanding Letters of Credit unless otherwise
agreed to by the Agent) to additional banks or other financial institutions with
the prior  written  approval of the Agent and, so long as no Default or Event of
Default has occurred and is continuing, the Borrowers, which approvals shall not
be  unreasonably  withheld.  Any Bank may at any  time,  and from  time to time,
assign to any branch,  lending office, or affiliate of such Bank all or any part
of its rights and  obligations  under the Loan  Documents by notice to the Agent
and the  Borrowers.  It is  further  agreed  that each  bank or other  financial
institution which executes and delivers to the Agent and the Borrowers hereunder
an  Assignment  and  Acceptance  substantially  in the form of  Exhibit E hereto
together with an assignment fee in the amount of $3,500 payable by the assigning
Bank  to the  Agent,  shall,  on the  date  specified  in  such  Assignment  and
Acceptance,  become a party to this  Agreement and the other Loan  Documents for
all purposes of this Agreement and the other Loan Documents,  and its portion of
the  Commitment,  the Loans and Letters of Credit  shall be as set forth in such
Assignment and  Acceptance.  The Bank assignor  thereunder  shall, to the extent
that rights and obligations  hereunder have been assigned by it pursuant to such
Assignment  and  Acceptance,  relinquish  its  rights and be  released  from its
obligations  under this  Agreement.  Upon the  execution  and  delivery  of such
Assignment and  Acceptance,  (a) the Borrowers  shall issue to the bank or other
financial  institution  a Note in the amount of such  bank's or other  financial
institution's  Commitment dated the date of the assignment or such other date as
may be specified by the Agent and otherwise  completed in substantially the form
of Exhibit A and to the extent any assigning  Bank has retained a portion of its
obligations  hereunder,  an appropriate  replacement  Note to the assigning Bank
reflecting its assignment;  (b) the Agent shall distribute to the Borrowers, the
Banks and such bank or financial institution a schedule reflecting such changes;
and (c) this Agreement shall be appropriately  amended to reflect (i) the status
of the bank or financial  institution  as a party hereto and (ii) the status and
rights of the Banks hereunder.

     Each Bank shall also have the right to grant  participations to one or more
banks  or  other  financial  institutions  in  its  Commitment,  the  Loans  and
outstanding  Letters of Credit. The documents  evidencing any such participation
shall limit such participating bank or financial institutions voting rights with
respect to this  Agreement to the matters set forth in ss.14.8 which require the
vote of all Banks.

     Notwithstanding the foregoing, no assignment or participation shall operate
to increase the Total  Commitment  hereunder or otherwise  alter the substantive
terms  of this  Agreement.  Without  the  prior  consent  of the  Agent  and the
Borrowers,  no Bank which retains a Commitment hereunder shall have a Commitment
of less than  $5,000,000,  as such amount may be reduced upon  reductions in the
Total Commitment pursuant to ss.2.2 hereof.

     Anything contained in this ss.17 to the contrary notwithstanding,  any Bank
may at any time pledge all or any portion of its  interest and rights under this
Agreement  (including  all or any  portion  of its  Notes) to any of the  twelve
Federal  Reserve  Lenders  organized  under ss.4 of the Federal  Reserve Act, 12
U.S.C.  ss.341.  No such pledge or the  enforcement  thereof  shall  release the
pledgor  Lender from its  obligations  hereunder  or under any of the other Loan
Documents.

     ss.18.  PARTIES IN INTEREST.  All the terms of this Agreement and the other
Loan  Documents  shall be  binding  upon  and  inure  to the  benefit  of and be
enforceable by the  respective  successors and assigns of the parties hereto and
thereto; provided that no Borrower shall assign or transfer its rights hereunder
without the prior written consent of the Banks.

     ss.19. NOTICES, ETC.

     ss.19.1. Notices. Except as otherwise expressly provided in this Agreement,
all notices and other  communications  made or required to be given  pursuant to
this  Agreement  or the other Loan  Documents  shall be in writing  and shall be
delivered in hand, mailed by United States first-class mail, postage prepaid, or
sent by telecopier and confirmed by letter, addressed as follows:

         (a) if to the  Borrowers,  at 3155 N.W.  77th  Avenue,  Miami,  Florida
33122-1205, Attention: Edwin D. Johnson; Senior Vice President & Chief Financial
Officer,  telecopy number (305) 406-1908, with a copy to the Legal Department of
the Borrowers at the same address, telecopy number (305) 406-1907;

         (b) if to the Agent or BKB, at 100 Federal Street, Boston, 
Massachusetts  02110,  Attention:  Arthur  Oberheim,  Vice President, telecopy 
number 617-434-2160;

         or such other  address for notice as shall have last been  furnished in
writing to the Person giving the notice.

     Any such  notice or demand  shall be deemed to have been duly given or made
and to have become  effective (a) if delivered by hand to a responsible  officer
of the party to which it is directed, at the time of the receipt thereof by such
officer,  (b) if sent by  registered  or  certified  first-class  mail,  postage
prepaid,  five  Business  Days  after the  posting  thereof,  and (c) if sent by
telecopier,  at the time of the dispatch thereof with answer-back  confirmation,
if in normal  business  hours in the country of  receipt,  or  otherwise  at the
opening of business on the following Business Day.

     ss.19.2.  Deemed Notice. Except for notice of the occurrence of any Default
or Event of Default required pursuant to ss.6.14 hereof, the Agent and the Banks
shall be deemed to have received  notice of any matter  disclosed in the filings
of the Parent with the United States  Securities and Exchange  Commission at the
time such filing are delivered to the Banks.

     ss.20.  MISCELLANEOUS.   The  rights  and  remedies  herein  expressed  are
cumulative  and not exclusive of any other rights which the Banks or Agent would
otherwise  have. The captions in this Agreement are for convenience of reference
only and shall not define or limit the provisions hereof. This Agreement and any
amendment hereof may be executed in several  counterparts and by each party on a
separate  counterpart,  each of which when so executed and delivered shall be an
original, but all of which together shall constitute one instrument.  In proving
this Agreement it shall not be necessary to produce or account for more than one
such counterpart signed by the party against whom enforcement is sought.

     ss.21.  ENTIRE  AGREEMENT,  ETC. The Loan Documents and any other documents
executed in connection herewith or therewith express the entire understanding of
the parties with respect to the transactions  contemplated hereby.  Neither this
Agreement nor any term hereof may be changed, waived,  discharged or terminated,
except as  provided  in  ss.14.8.  No  waiver  shall  extend  to or  affect  any
obligation  not  expressly  waived or impair any right  consequent  thereon.  No
course of dealing or omission on the part of the Agent or any Bank in exercising
any right shall operate as a waiver thereof or otherwise be prejudicial thereto.
No notice to or demand upon the  Borrowers  shall entitle the Borrowers to other
or further notice or demand in similar or other circumstances.

     ss.22.  WAIVER OF JURY TRIAL. EACH OF THE BORROWERS HEREBY WAIVES ITS RIGHT
TO A JURY TRIAL WITH  RESPECT TO ANY ACTION OR CLAIM  ARISING OUT OF ANY DISPUTE
IN CONNECTION WITH THIS AGREEMENT, THE NOTES OR ANY OF THE OTHER LOAN DOCUMENTS,
ANY RIGHTS OR  OBLIGATIONS  HEREUNDER OR THEREUNDER OR THE  PERFORMANCE  OF SUCH
RIGHTS AND OBLIGATIONS. EXCEPT AS PROHIBITED BY LAW, EACH BORROWER HEREBY WAIVES
ANY RIGHT IT MAY HAVE TO CLAIM OR RECOVER IN ANY  LITIGATION  REFERRED TO IN THE
PRECEDING SENTENCE ANY SPECIAL, EXEMPLARY,  PUNITIVE OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES  OTHER THAN, OR IN ADDITION TO,  ACTUAL  DAMAGES.  THE BORROWERS (a)
CERTIFY THAT NO  REPRESENTATIVE,  AGENT OR ATTORNEY OF ANY BANK OR THE AGENT HAS
REPRESENTED,  EXPRESSLY OR OTHERWISE,  THAT SUCH BANK OR THE AGENT WOULD NOT, IN
THE  EVENT  OF  LITIGATION,  SEEK  TO  ENFORCE  THE  FOREGOING  WAIVERS  AND (b)
ACKNOWLEDGE  THAT THE AGENT AND THE BANKS  HAVE BEEN  INDUCED TO ENTER INTO THIS
AGREEMENT AND THE OTHER LOAN  DOCUMENTS TO WHICH IT IS A PARTY BECAUSE OF, AMONG
OTHER THINGS, THE BORROWERS' WAIVERS AND CERTIFICATIONS CONTAINED HEREIN.

     ss.23.  GOVERNING  LAW. THIS AGREEMENT AND EACH OF THE OTHER LOAN DOCUMENTS
(OTHER  THAN THE  INTERNATIONAL  PLEDGE  DOCUMENTS  DEFINED IN THE SINTEL  STOCK
PLEDGE   AGREEMENT)  ARE  CONTRACTS  UNDER  THE  LAWS  OF  THE  COMMONWEALTH  OF
MASSACHUSETTS  AND SHALL FOR ALL PURPOSES BE CONSTRUED  IN  ACCORDANCE  WITH AND
GOVERNED BY THE LAWS OF SAID  COMMONWEALTH  (EXCLUDING  THE LAWS  APPLICABLE  TO
CONFLICTS OR CHOICE OF LAW). THE BORROWERS CONSENT TO THE JURISDICTION OF ANY OF
THE FEDERAL OR STATE COURTS  LOCATED IN THE  COMMONWEALTH  OF  MASSACHUSETTS  IN
CONNECTION  WITH ANY SUIT TO ENFORCE  THE RIGHTS OF ANY BANK OR THE AGENT  UNDER
THIS AGREEMENT OR ANY OF THE OTHER LOAN DOCUMENTS.

     ss.24. SEVERABILITY.  The provisions of this Agreement are severable and if
any one clause or provision  hereof shall be held  invalid or  unenforceable  in
whole or in part in any jurisdiction,  then such invalidity or  unenforceability
shall  affect  only  such  clause  or  provision,   or  part  thereof,  in  such
jurisdiction, and shall not in any manner affect such clause or provision in any
other  jurisdiction,  or any other clause or provision of this  Agreement in any
jurisdiction.





            [The remainder of this page is intentionally left blank.]




<PAGE>



         IN WITNESS  WHEREOF,  the undersigned have duly executed this Agreement
under seal as of the date first set forth above.


                               THE BORROWERS:

                               MASTEC, INC.



                               By:______________________________________________
                               Title:___________________________________________

                               B & D CONTRACTORS OF SHELBY, INC.
                               BURNUP & SIMS OF TEXAS, INC.
                               BURNUP & SIMS OF THE CAROLINAS, INC.
                               HARRISON-WRIGHT CO., INC.
                               UTILITY PRECAST, INC.
                               BURNUP & SIMS TELCOM OF FLORIDA, INC.
                               BURNUP & SIMS TSI, INC.
                               CHURCH & TOWER ENVIRONMENTAL, INC.
                               CHURCH & TOWER FIBER TEL, INC.
                               CHURCH & TOWER, INC.
                               CHURCH & TOWER OF FLORIDA, INC.
                               CHURCH & TOWER OF TN, INC.
                               DESIGNED TRAFFIC INSTALLATION CO.
                               GDSI, INC.
                               KENNEDY CABLE CONSTRUCTION, INC.
                               LATLINK CORPORATION
                               LATLINK ARGENTINA, INC.
                               MASTEC COMTEC OF CALIFORNIA, INC.
                               MASTEC COMTEC OF THE CAROLINAS, INC.
                               MASTEC TECHNOLOGIES, INC.
                               MASTEC TELEPORT, INC.
                               R.D. MOODY & ASSOCIATES, INC.
                               R.D. MOODY AND ASSOCIATES, INC. OF   VIRGINIA
                               SHANCO CORPORATION
                               UTILITY LINE MAINTENANCE, INC.



                               By:______________________________________________
                               Title:___________________________________________
<PAGE>


                               THE BANKS:

                               CREDITANSTALT-BANKVEREIN



                               By:______________________________________________
                               Title:___________________________________________



                               By:______________________________________________
                               Title:___________________________________________

                               FIRST UNION NATIONAL BANK OF FLORIDA



                               By:______________________________________________
                               Title:___________________________________________

                               THE SUMITOMO BANK, LIMITED



                               By:______________________________________________
                               Title:___________________________________________




                               By:______________________________________________
                               Title:___________________________________________

                               SCOTIABANC INC.



                               By:______________________________________________
                               Title:___________________________________________



<PAGE>



                               THE FUJI BANK AND TRUST COMPANY



                               By:______________________________________________
                               Title:___________________________________________

                               COMERICA BANK



                               By:______________________________________________
                               Title:___________________________________________

                               LTCB TRUST COMPANY



                               By:______________________________________________
                               Title:___________________________________________

                               BANKBOSTON, N.A.,
                                 individually and as Agent



                               By:______________________________________________
                               Title:___________________________________________



                                  Exhibit 10.7

                          SECOND AMENDMENT TO REVOLVING
                                CREDIT AGREEMENT


         THIS SECOND  AMENDMENT  TO REVOLVING  CREDIT  AGREEMENT  (this  "Second
Amendment")  is made and entered into as of the 31st day of July,  1998,  by and
among MASTEC,  INC., a Delaware  corporation  (the "Parent"),  its  Subsidiaries
(other than Excluded Subsidiaries and members of the MasTec International Group)
listed on Schedule 1 to the Credit  Agreement  defined below  (together with the
Parent, collectively the "Borrowers"), BANKBOSTON, N.A., CREDITANSTALT CORPORATE
FINANCE,  INC., FIRST UNION NATIONAL BANK OF FLORIDA,  SCOTIABANC INC., THE FUJI
BANK AND TRUST COMPANY, COMERICA BANK and LTCB TRUST COMPANY (collectively,  the
"Banks") and BANKBOSTON, N.A. as agent (the "Agent") for the Banks.

         WHEREAS,  the  Borrowers,  the  Banks  and  the  Agent  entered  into a
Revolving  Credit  Agreement  dated as of June 9,  1997,  as  amended by a First
Amendment to  Revolving  Credit  Agreement  dated as of January 28, 1998 (as the
same  may be  further  amended  and in  effect  from  time to time  the  "Credit
Agreement"), pursuant to which the Banks extended credit to the Borrowers on the
terms set forth therein;

         WHEREAS, the Parent has informed the Banks that G.J.S. Construction 
Company has merged into Shanco Corporation;

         WHEREAS,  the  Parent  has  requested  that the Banks  consent  to make
effective the provisions of ss.7.3(e)(ii) of the Credit Agreement, and the Banks
are willing to consent to make effective the provisions of  ss.7.3(e)(ii) of the
Credit Agreement on the terms set forth herein;

         WHEREAS,  the  Parent has  requested  certain  revisions  to the Credit
Agreement and the parties desire to amend the Credit  Agreement on the terms set
forth herein;

         NOW, THEREFORE,  in consideration of the foregoing,  and for other good
and  valuable  consideration,  the receipt and  sufficiency  of which are hereby
acknowledged, the parties agree to amend the Credit Agreement as follows:

         1.       Definitions.  Capitalized terms used herein without 
definition shall have the meanings assigned to such terms in the
Credit Agreement.


         2. Addition of Creditanstalt  Corporate Finance,  Inc. Pursuant to that
certain  Assignment  and  Acceptance  dated as of April 1, 1998,  by and between
Creditanstalt AG (f/k/a  Creditanstalt-Bankverein)  and Creditanstalt  Corporate
Finance, Inc. ("CCFI"), as of such date CCFI accepted and assumed the rights and
obligations of a Bank under the Credit Agreement.

         3. Amendment to ss.1 of the Credit  Agreement.  Effective as of July 9,
1998, ss.1 of the Credit  Agreement is hereby amended by deleting the definition
of "Commitment Percentage" in its entirety and substituting in place thereof the
following new definition:

                  "Commitment  Percentage.   With  respect  to  each  Bank,  the
         percentage set forth beside its name below (subject to adjustment  upon
         any assignments pursuant to ss.17):

                         Bank                                        Percentage

                         BKB                                         21.6000%
                         First Union                                 20.0000%
                         Comerica                                    13.6000%
                         LTCB                                        13.6000%
                         Creditanstalt Corporate
                           Finance, Inc.                             10.4000%
                         Fuji                                        10.4000%
                         SBI                                         10.4000%".

         4.  Amendment  to ss.7.3 of the Credit  Agreement.  Section  7.3 of the
Credit  Agreement is hereby amended by deleting  clause  (e)(ii)  thereof in its
entirety and substituting in place thereof the following new clause (e)(ii):

                  "(ii) (A) 50% of net cash proceeds received in connection with
         the  issuance  by the  Parent  of the  Senior  Subordinated  Notes  due
         February 1, 2008."

         5.  Amendment  to ss.8.1 of the Credit  Agreement.  Section  8.1 of the
Credit  Agreement  is hereby  amended  by  deleting  clause  (b)  thereof in its
entirety and substituting in place thereof the following new clause (b):

         "(b) the ratio of (i) Funded Debt to (ii) EBITDA for the period of four
         (4)  consecutive  fiscal  quarters ending on such date shall not exceed
         the ratio set forth opposite such date below:

                     --------------------------------- ------------------------
                                   Date                         Ratio
                     --------------------------------- ------------------------
                              June 30, 1998                    4.50:1
                     --------------------------------- ------------------------
                            September 30, 1998                 4.50:1
                     --------------------------------- ------------------------
                            December 31, 1998                  4.00:1
                     --------------------------------- ------------------------
                              March 31, 1999                   3.50:1
                     --------------------------------- ------------------------
                              June 30, 1999                    3.25:1
                     --------------------------------- ------------------------
                          September 30, 1999 and               3.00:1
                                thereafter                                  
                     --------------------------------- ------------------------

         6.  Amendment  to ss.8.3 of the Credit  Agreement.  Section  8.3 of the
Credit  Agreement  is hereby  amended by  deleting  ss.8.3 in its  entirety  and
substituting in place thereof the following new ss.8.3:

                  "ss.8.3  Interest  Coverage Ratio. As of the end of any fiscal
         quarter of the  Borrowers  commencing  with the fiscal  quarter  ending
         March  31,  1997,  the  ratio of (a) EBIT  for the  period  of four (4)
         consecutive  fiscal  quarters  ending on such date to (b)  Consolidated
         Total Interest Expense for such period shall not be less than the ratio
         set forth opposite such date below:

                     --------------------------------- ------------------------
                                   Date                         Ratio
                     --------------------------------- ------------------------
                              June 30, 1998                    3.50:1
                     --------------------------------- ------------------------
                            September 30, 1998                 2.50:1
                     --------------------------------- ------------------------
                            December 31, 1998                  2.50:1
                     --------------------------------- ------------------------
                              March 31, 1999                   2.75:1
                     --------------------------------- ------------------------
                              June 30, 1999                    3.00:1      
                     --------------------------------- ------------------------
                            September 30, 1999                 3.25:1       
                     --------------------------------- ------------------------
                            December 31, 1999                  3.50:1     
                     --------------------------------- ------------------------
                                Thereafter                     4.00:1."
                     --------------------------------- ------------------------

         7.  Amendment  to ss.8.4 of the Credit  Agreement.  Section  8.4 of the
Credit  Agreement  is hereby  amended by  deleting  ss.8.4 in its  entirety  and
substituting in place thereof the following new ss.8.4:

         "ss.8.4  [This section intentionally omitted.]"

         8.  Amendment Fee. Each Bank which executed and delivered its signature
pages by 5:00 p.m.  July 31, 1998 by  facsimile  (to be  followed by  originals)
shall  receive  from the Parent an  amendment  fee equal to 0.05% of such Bank's
Commitment payable to such Bank for its own account.

     9.  Effectiveness.  This Second Amendment shall be effective as of the date
hereof, subject to the receipt by the Agent of this Second  Amendment  duly and
properly  authorized,  executed and delivered by the respective  parties hereto.
This Second  Amendment shall become  effective upon  satisfaction of each of the
following conditions:

         (a)  This Second Amendment shall have been executed and delivered
         by the respective parties hereto;

         (b)  The  Borrowers  shall  have  executed  and  delivered  an
         affidavit  regarding the execution of the Second  Amendment  outside of
         the State of Florida; and

         (c)  Shanco  Corporation  shall  have  delivered  to the Agent
         copies of its certificate  and/or plan of merger filed with its charter
         or other incorporation  documents,  certified by the Secretary of State
         of its jurisdictions of incorporation;

         provided,  however,  that as of the Effective  Date ss.2 of this Second
Amendment shall be deemed to have been effective as of April 1, 1998 and ss.3 of
this Second Amendment shall be deemed to have been effective as of July 9, 1998.

         10.  Representations and Warranties.  Each of the Borrowers represents
and warrants as follows:

         (a) The  execution, delivery and  performance of each of this Second
         Amendment and the transactions  contemplated  hereby are within the
         corporate  power and  authority of such  Borrower and have been or will
         be  authorized  by proper  corporate  proceedings,  and do not (a)
         require any consent or approval of the  stockholders  of such Borrower,
         (b)  contravene  any  provision of the charter  documents or by-laws of
         such  Borrower  or any  law,  rule  or  regulation  applicable  to such
         Borrower, or (c) contravene any provision of, or constitute an event of
         default or event  which,  but for the  requirement  that time elapse or
         notice be given, or both,  would  constitute an event of default under,
         any other material agreement, instrument or undertaking binding on such
         Borrower.

         (b) This Second Amendment and the Credit Agreement, as amended as of 
         the date hereof,  and all of the terms and provisions  hereof and
         thereof are the legal,  valid and binding  obligations of such Borrower
         enforceable in accordance with their respective terms except as limited
         by  bankruptcy,  insolvency,  reorganization,  moratorium or other laws
         affecting the enforcement of creditors' rights generally, and except as
         the remedy of specific  performance or of injunctive  relief is subject
         to the discretion of the court before which any proceeding therefor may
         be brought.

                  (c) The  execution,  delivery and  performance  of this Second
         Amendment and the transactions  contemplated  hereby do not require any
         approval  or  consent  of,  or  filing  or   registration   with,   any
         governmental or other agency or authority, or any other party.

                  (d) The  representations  and warranties  contained in ss.5 of
         the Credit  Agreement are true and correct in all material  respects as
         of the date hereof as though made on and as of the date hereof.

                  (e) No Default or Event of Default under the Credit  Agreement
has occurred and is continuing.

         11.  Ratification,  etc. Except as expressly amended hereby, the Credit
Agreement,  the  other  Loan  Documents  and  all  documents,   instruments  and
agreements related thereto are hereby ratified and confirmed in all respects and
shall  continue in full force and effect.  This Second  Amendment and the Credit
Agreement shall hereafter be read and construed  together as a single  document,
and  all  references  in the  Credit  Agreement  or  any  related  agreement  or
instrument to the Credit Agreement shall hereafter refer to the Credit Agreement
as amended by this Second Amendment.

         12.  GOVERNING  LAW.  THIS  SECOND  AMENDMENT  SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF  MASSACHUSETTS  AND
SHALL TAKE EFFECT AS A SEALED INSTRUMENT IN ACCORDANCE WITH SUCH LAWS.

         13.  Counterparts.  This Second Amendment may be executed in any number
of counterparts and by different parties hereto on separate  counterparts,  each
of which when so executed and delivered  shall be an original,  but all of which
counterparts  taken  together  shall be  deemed to  constitute  one and the same
instrument.


<PAGE>


         IN WITNESS  WHEREOF,  each of the  undersigned  have duly executed this
Second Amendment under seal as of the date first set forth above.

                                    The Borrowers:

                                    MASTEC, INC.



                                    By:___________________________________
                                        Name:
                                        Title:




                       [SIGNATURES CONTINUED ON NEXT PAGE]


<PAGE>


                                    B & D CONTRACTORS OF SHELBY, INC.
                                    BURNUP & SIMS OF TEXAS, INC.
                                    HARRISON-WRIGHT CO., INC.
                                    UTILITY PRECAST, INC.
                                    BURNUP & SIMS TELCOM OF FLORIDA, INC.
                                    CHURCH & TOWER ENVIRONMENTAL, INC.
                                    CHURCH & TOWER FIBER TEL, INC.
                                    CHURCH & TOWER, INC.
                                    CHURCH & TOWER OF FLORIDA, INC.
                                    CHURCH & TOWER OF TN, INC.
                                    DESIGNED TRAFFIC INSTALLATION CO.
                                    GDSI, INC.
                                    KENNEDY CABLE CONSTRUCTION, INC.
                                    LATLINK CORPORATION
                                    LATLINK ARGENTINA, INC.
                                    MASTEC COMTEC OF CALIFORNIA, INC.
                                    MASTEC COMTEC OF THE CAROLINAS, INC.
                                    MASTEC TECHNOLOGIES, INC.
                                    MASTEC TELEPORT, INC.
                                    R.D. MOODY & ASSOCIATES, INC.
                                    R.D. MOODY AND ASSOCIATES, INC. OF VIRGINIA
                                    SHANCO CORPORATION
                                    UTILITY LINE MAINTENANCE, INC.
                                    AIDCO, INC.
                                    AIDCO SYSTEMS, INC.
                                    E. L. DALTON & COMPANY, INC.
                                    NORTHLAND CONTRACTING, INC.
                                    WILDE CONSTRUCTION, INC.
                                    WILDE OPTICAL SERVICE, INC.
                                    TELE-COMMUNICATIONS CORPORATION OF VIRGINIA
                                    WILDE ACQUISITION CO., INC.
                                    WILDE HOLDING CO., INC.
                                    WEEKS CONSTRUCTION COMPANY
                                    C & S DIRECTIONAL BORING, INC.
                                    LESSARD-NYREN UTILITIES, INC.
                                    LNU, INC.
                                    S.S.S. CONSTRUCTION, INC.
                                    CONTRACT MANAGEMENT AND ASSISTANCE CORP.
                                    ELECTRONIC EQUIPMENT ANALYZERS, INC.



                                    By:___________________________________
                                        Name:
                                        Title:


<PAGE>


                                    The Banks:

                                    CREDITANSTALT CORPORATE FINANCE, INC.



                                    By:___________________________________
                                        Name:
                                        Title:



                                    By:___________________________________
                                        Name:
                                        Title:

                                    FIRST UNION NATIONAL BANK OF FLORIDA



                                    By:___________________________________
                                        Name:
                                        Title:

                                    SCOTIABANC INC.



                                    By:___________________________________
                                        Name:
                                        Title:

                                    THE FUJI BANK AND TRUST COMPANY



                                    By:___________________________________
                                        Name:
                                        Title:

                                    COMERICA BANK



                                    By:___________________________________
                                        Name:
                                        Title:



<PAGE>



                                    LTCB TRUST COMPANY



                                    By:___________________________________
                                        Name:
                                        Title:

                                    BANKBOSTON, N.A.,
                                      individually and as Agent



                                    By:___________________________________
                                        Name:
                                        Title:



<PAGE>

                          THIRD AMENDMENT TO REVOLVING
                                CREDIT AGREEMENT


         THIS  THIRD  AMENDMENT  TO  REVOLVING  CREDIT  AGREEMENT  (this  "Third
Amendment")  is made and entered into as of the 11th day of September,  1998, by
and among MASTEC, INC., a Delaware corporation (the "Parent"),  its Subsidiaries
(other than Excluded Subsidiaries and members of the MasTec International Group)
listed on Schedule 1 to the Credit  Agreement  defined below  (together with the
Parent, collectively the "Borrowers"), BANKBOSTON, N.A., CREDITANSTALT CORPORATE
FINANCE,  INC., FIRST UNION NATIONAL BANK OF FLORIDA,  SCOTIABANC INC., THE FUJI
BANK AND TRUST COMPANY, COMERICA BANK and LTCB TRUST COMPANY (collectively,  the
"Banks") and BANKBOSTON, N.A. as agent (the "Agent") for the Banks.

         WHEREAS,  the  Borrowers,  the  Banks  and  the  Agent  entered  into a
Revolving  Credit  Agreement  dated as of June 9,  1997,  as  amended by a First
Amendment to Revolving  Credit  Agreement  dated as of January 28, 1998,  and as
further amended by a Second  Amendment to Revolving Credit Agreement dated as of
July 31st,  1998 (as the same may be further  amended and in effect from time to
time the "Credit Agreement"), pursuant to which the Banks extended credit to the
Borrowers on the terms set forth therein;

         WHEREAS,  the  Parent has  requested  certain  revisions  to the Credit
Agreement and the parties desire to amend the Credit  Agreement on the terms set
forth herein;

         NOW, THEREFORE,  in consideration of the foregoing,  and for other good
and  valuable  consideration,  the receipt and  sufficiency  of which are hereby
acknowledged, the parties agree to amend the Credit Agreement as follows:

         1.  Definitions.  Capitalized terms used herein without  definition 
shall have the meanings assigned to such terms in the Credit Agreement.

         2.  Amendment of ss.1 of the Loan Agreement. Section 1 of the Credit
Agreement is hereby amended by

         (a)  inserting  the  following  definition  in its proper  alphabetical
place:

                  "Equity Purchase Contract. Any agreement (including any master
         agreement and any agreement, whether or not in writing, relating to any
         single  transaction)  that is an equity derivative or equity index swap
         or option or other  similar  agreement  (including  any option to enter
         into any of the foregoing)."

         and (b) deleting the  definition of  "Obligations"  in its entirety and
replacing  it  with  the  following  new  definition,  inserted  in  its  proper
alphabetical place:

                  "Obligations. All indebtedness, obligations and liabilities of
         the  Borrowers  to any of the  Banks  or  the  Agent,  individually  or
         collectively,  existing  on the  date  of  this  Agreement  or  arising
         thereafter,   direct  or  indirect,  joint  or  several,   absolute  or
         contingent, matured or unmatured,  liquidated or unliquidated,  secured
         or  unsecured,  arising by  contract,  operation  of law or  otherwise,
         arising  or  incurred  under  this  Agreement  or any of the other Loan
         Documents,  or under any Equity Purchase Contract between the Borrowers
         and any Bank,  or in respect of any of the Loans made or  Reimbursement
         Obligations   incurred   or  any  of  the   Notes,   Letter  of  Credit
         Applications,  Letters  of  Credit  or  other  instruments  at any time
         evidencing any thereof."

         3.  Amendment  to ss.7.6 of the Credit  Agreement.  Section  7.6 of the
Credit  Agreement  is hereby  amended by  deleting  ss.7.6 in its  entirety  and
substituting in place thereof the following new ss.7.6:

                  "ss.7.6 Restricted Distributions and Redemptions.  None of the
         Borrowers  may make  Distributions  except as set forth in this ss.7.6.
         Each Borrower may make distributions  payable solely in common stock or
         preferred stock of such Borrower,  subject to the requirement to pledge
         all such stock  pursuant to ss.5.19  hereof.  Borrowers  other than the
         Parent may declare or pay Distributions to the Parent. In addition, the
         Borrowers (other than the Parent) shall not redeem,  convert, retire or
         otherwise  acquire  shares  of any  class  of  capital  stock  of  such
         Borrowers.  The Parent may  declare or pay  dividends  and may  redeem,
         convert,  retire,  or  otherwise  acquire  shares of its capital  stock
         (either directly or via an Equity Purchase Contract), provided that the
         aggregate  amount of all such  Distributions  by the  Parent  shall not
         exceed (i) 50% of Consolidated  Net Income in any one fiscal year, plus
         (ii) $10,000,000  (which $10,000,000 shall not be reduced by any losses
         in  Consolidated  Net  Income).  None of the  Borrowers  may  make  any
         Distribution  under this ss.7.6 if a Default or Event of Default exists
         or would be created by the making of such  Distribution.  The Borrowers
         shall not effect or permit any change in or  amendment  to any document
         or  instrument  pertaining  to  the  terms  of  the  Borrowers'  or the
         International  Signatories'  capital  stock other than the amendment to
         the Parent's  certificate  of  incorporation  increasing the authorized
         amount of common  stock and the par value of the  common  stock and the
         preferred stock."

     4.  Effectiveness.  This Third  Amendment shall be effective as of the date
hereof,  subject to the  receipt by the Agent of this Third  Amendment  duly and
properly  authorized,  executed and delivered by the respective  parties hereto.
This Third  Amendment  shall become  effective upon  satisfaction of each of the
following conditions:

     (a) This Third  Amendment  shall have been  executed  and  delivered by the
respective parties hereto; and

     (b) The Borrowers shall have executed and delivered an affidavit  regarding
the execution of the Third Amendment outside of the State of Florida.

     5.  Representations  and Warranties.  Each of the Borrowers  represents and
warrants as follows:

                  (a) The  execution,  delivery and  performance of each of this
         Third Amendment and the transactions contemplated hereby are within the
         corporate power and authority of such Borrower and have been or will be
         authorized by proper corporate proceedings,  and do not (a) require any
         consent  or  approval  of  the  stockholders  of  such  Borrower,   (b)
         contravene  any  provision of the charter  documents or by-laws of such
         Borrower or any law, rule or regulation applicable to such Borrower, or
         (c)  contravene  any provision of, or constitute an event of default or
         event  which,  but for the  requirement  that time  elapse or notice be
         given, or both,  would  constitute an event of default under, any other
         material agreement, instrument or undertaking binding on such Borrower.

                  (b) This Third Amendment and the Credit Agreement,  as amended
         as of the date hereof,  and all of the terms and provisions  hereof and
         thereof are the legal,  valid and binding  obligations of such Borrower
         enforceable in accordance with their respective terms except as limited
         by  bankruptcy,  insolvency,  reorganization,  moratorium or other laws
         affecting the enforcement of creditors' rights generally, and except as
         the remedy of specific  performance or of injunctive  relief is subject
         to the discretion of the court before which any proceeding therefor may
         be brought.

                  (c) The  execution,  delivery  and  performance  of this Third
         Amendment and the transactions  contemplated  hereby do not require any
         approval  or  consent  of,  or  filing  or   registration   with,   any
         governmental or other agency or authority, or any other party.

                  (d) The  representations  and warranties  contained in ss.5 of
         the Credit  Agreement are true and correct in all material  respects as
         of the date hereof as though made on and as of the date hereof.

                  (e) No Default or Event of Default under the Credit  Agreement
has occurred and is continuing.

         6.  Ratification,  etc. Except as expressly amended hereby,  the Credit
Agreement,  the  other  Loan  Documents  and  all  documents,   instruments  and
agreements related thereto are hereby ratified and confirmed in all respects and
shall  continue in full force and effect.  This Third  Amendment  and the Credit
Agreement shall hereafter be read and construed  together as a single  document,
and  all  references  in the  Credit  Agreement  or  any  related  agreement  or
instrument to the Credit Agreement shall hereafter refer to the Credit Agreement
as amended by this Third Amendment.

         7.  GOVERNING  LAW.  THIS  THIRD  AMENDMENT  SHALL BE  GOVERNED  BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF  MASSACHUSETTS  AND
SHALL TAKE EFFECT AS A SEALED INSTRUMENT IN ACCORDANCE WITH SUCH LAWS.

         8. Counterparts.  This Third Amendment may be executed in any number of
counterparts and by different parties hereto on separate  counterparts,  each of
which when so executed  and  delivered  shall be an  original,  but all of which
counterparts  taken  together  shall be  deemed to  constitute  one and the same
instrument.


<PAGE>


         IN WITNESS  WHEREOF,  each of the  undersigned  have duly executed this
Third Amendment under seal as of the date first set forth above.

                                    The Borrowers:

                                    MASTEC, INC.



                                    By:___________________________________
                                        Name:
                                        Title:




                       [SIGNATURES CONTINUED ON NEXT PAGE]


<PAGE>


                                    B & D CONTRACTORS OF SHELBY, INC.
                                    BURNUP & SIMS OF TEXAS, INC.
                                    HARRISON-WRIGHT CO., INC.
                                    UTILITY PRECAST, INC.
                                    BURNUP & SIMS TELCOM OF FLORIDA, INC.
                                    CHURCH & TOWER ENVIRONMENTAL, INC.
                                    CHURCH & TOWER FIBER TEL, INC.
                                    CHURCH & TOWER, INC.
                                    CHURCH & TOWER OF FLORIDA, INC.
                                    CHURCH & TOWER OF TN, INC.
                                    DESIGNED TRAFFIC INSTALLATION CO.
                                    GDSI, INC.
                                    KENNEDY CABLE CONSTRUCTION, INC.
                                    LATLINK CORPORATION
                                    LATLINK ARGENTINA, INC.
                                    MASTEC COMTEC OF CALIFORNIA, INC.
                                    MASTEC COMTEC OF THE CAROLINAS, INC.
                                    MASTEC TECHNOLOGIES, INC.
                                    MASTEC TELEPORT, INC.
                                    R.D. MOODY & ASSOCIATES, INC.
                                    R.D. MOODY AND ASSOCIATES, INC. OF VIRGINIA
                                    SHANCO CORPORATION
                                    UTILITY LINE MAINTENANCE, INC.
                                    AIDCO, INC.
                                    AIDCO SYSTEMS, INC.
                                    E. L. DALTON & COMPANY, INC.
                                    NORTHLAND CONTRACTING, INC.
                                    WILDE CONSTRUCTION, INC.
                                    WILDE OPTICAL SERVICE, INC.
                                    TELE-COMMUNICATIONS CORPORATION OF VIRGINIA
                                    WILDE ACQUISITION CO., INC.
                                    WILDE HOLDING CO., INC.
                                    WEEKS CONSTRUCTION COMPANY
                                    C & S DIRECTIONAL BORING, INC.
                                    LESSARD-NYREN UTILITIES, INC.
                                    LNU, INC.
                                    S.S.S. CONSTRUCTION, INC.
                                    CONTRACT MANAGEMENT AND ASSISTANCE CORP.
                                    ELECTRONIC EQUIPMENT ANALYZERS, INC.



                                    By:___________________________________
                                        Name:
                                        Title:


<PAGE>


                                    The Banks:

                                    CREDITANSTALT CORPORATE FINANCE, INC.



                                    By:___________________________________
                                        Name:
                                        Title:



                                    By:___________________________________
                                        Name:
                                        Title:

                                    FIRST UNION NATIONAL BANK OF FLORIDA



                                    By:___________________________________
                                        Name:
                                        Title:

                                    SCOTIABANC INC.



                                    By:___________________________________
                                        Name:
                                        Title:

                                    THE FUJI BANK AND TRUST COMPANY



                                    By:___________________________________
                                        Name:
                                        Title:

                                    COMERICA BANK



                                    By:___________________________________
                                        Name:
                                        Title:



<PAGE>



                                    LTCB TRUST COMPANY



                                    By:___________________________________
                                        Name:
                                        Title:

                                    BANKBOSTON, N.A.,
                                      individually and as Agent



                                    By:___________________________________
                                        Name:
                                        Title:


<PAGE>

                          FOURTH AMENDMENT TO REVOLVING
                                CREDIT AGREEMENT


         THIS FOURTH  AMENDMENT  TO REVOLVING  CREDIT  AGREEMENT  (this  "Fourth
Amendment")  is made and entered into as of the 25th day of September,  1998, by
and among MASTEC, INC., a Delaware corporation (the "Parent"),  its Subsidiaries
(other than Excluded Subsidiaries and members of the MasTec International Group)
listed on Schedule 1 to the Credit  Agreement  defined below  (together with the
Parent, collectively the "Borrowers"), BANKBOSTON, N.A., CREDITANSTALT CORPORATE
FINANCE,  INC., FIRST UNION NATIONAL BANK OF FLORIDA,  SCOTIABANC INC., THE FUJI
BANK AND TRUST COMPANY, COMERICA BANK and LTCB TRUST COMPANY (collectively,  the
"Banks") and BANKBOSTON, N.A. as agent (the "Agent") for the Banks.

         WHEREAS,  the  Borrowers,  the  Banks  and  the  Agent  entered  into a
Revolving  Credit  Agreement  dated as of June 9,  1997,  as  amended by a First
Amendment to Revolving Credit Agreement dated as of January 28, 1998, as further
amended by a Second Amendment to Revolving Credit Agreement dated as of July 31,
1998, and as further amended by a Third Amendment to Revolving  Credit Agreement
dated as of September 11, 1998 (as the same may be further amended and in effect
from time to time the "Credit Agreement"),  pursuant to which the Banks extended
credit to the Borrowers on the terms set forth therein;

         WHEREAS,  the  Parent has  requested  certain  revisions  to the Credit
Agreement and the parties desire to amend the Credit  Agreement on the terms set
forth herein;

         NOW, THEREFORE,  in consideration of the foregoing,  and for other good
and  valuable  consideration,  the receipt and  sufficiency  of which are hereby
acknowledged, the parties agree to amend the Credit Agreement as follows:

         1.  Definitions. Capitalized terms used herein without definition shall
 have the meanings assigned to such terms in the Credit Agreement.

         2.  Amendment of ss.1 of the Loan Agreement. Section 1 of the Credit 
Agreement is hereby amended by

         (a)  inserting  the  following  definition  in its proper  alphabetical
place:

             "Approval Date.  The date on which all of the Banks agree to
 the pricing change for documentary Letters of Credit."

         and (b)  deleting the  definitions  of "Letters of Credit" and "Pricing
Table" in their entirety and replacing them with the following new  definitions,
inserted in proper alphabetical order:

             "Letters  of Credit.  Documentary  or standby  Letters of Credit  
issued or to be issued by the Agent under ss.3 hereof for the account of the
Borrowers."


         "Pricing Table:

 ----------------- ------------------- ----------------- ---------------------
                      Applicable             Applicable             Applicable
 Pricing Ratio    LIBOR Margin            L/C Margin          Commitment Rate
                      (per annum)           (per annum)            (per annum)
 ----------------- ------------------- ----------------- ---------------------
 less than 1.00:1       0.75%                 0.75%                  0.250%
 ----------------- ------------------- ----------------- ---------------------
 greater than or equal to
 1.00:1, but less than 1.50:1
                        1.00%                 1.00%                  0.250%
 ----------------- ------------------- ----------------- ---------------------
 greater than or equal to
 1.50:1, but less than 2.00:1
                        1.25%                 1.25%                  0.375%
 ----------------- ------------------- ----------------- ---------------------
 greater than or equal to 2.00:1
                        1.50%                 1.50%                  0.375%
 ----------------- ------------------- ----------------- ---------------------

provided  that  prior to the  Approval  Date,  the  Applicable  L/C  Margin  for
documentary Letters of Credit shall be as set forth in the table above, and that
on and after the  Approval  Date,  the  Applicable  L/C Margin  for  documentary
Letters of Credit shall be priced at the  Applicable L/C Margin set forth in the
table above multiplied by 0.5."

         3.  Amendment  to ss.3.1 of the Credit  Agreement.  Section  3.1 of the
Credit  Agreement  is hereby  amended by deleting  the figure  "$10,000,000"  in
clause (a) and substituting in place thereof the figure "$20,000,000".

         4.  Effectiveness.  This Fourth  Amendment shall be effective as of the
date hereof,  subject to the receipt by the Agent of this Fourth  Amendment duly
and properly  authorized,  executed and delivered by the Majority  Banks and the
Borrowers,  whereas the pricing change for  documentary  Letters of Credit shall
only be effective upon the approval of all of the Banks.

         5.  Representations and Warranties.  Each of the Borrowers represents
and warrants as follows:

                  (a) The  execution,  delivery and  performance of each of this
         Fourth  Amendment and the transactions  contemplated  hereby are within
         the  corporate  power and  authority of such  Borrower and have been or
         will be  authorized  by proper  corporate  proceedings,  and do not (a)
         require any consent or approval of the  stockholders  of such Borrower,
         (b)  contravene  any  provision of the charter  documents or by-laws of
         such  Borrower  or any  law,  rule  or  regulation  applicable  to such
         Borrower, or (c) contravene any provision of, or constitute an event of
         default or event  which,  but for the  requirement  that time elapse or
         notice be given, or both,  would  constitute an event of default under,
         any other material agreement, instrument or undertaking binding on such
         Borrower.

                  (b) This Fourth Amendment and the Credit Agreement, as amended
         as of the date hereof,  and all of the terms and provisions  hereof and
         thereof are the legal,  valid and binding  obligations of such Borrower
         enforceable in accordance with their respective terms except as limited
         by  bankruptcy,  insolvency,  reorganization,  moratorium or other laws
         affecting the enforcement of creditors' rights generally, and except as
         the remedy of specific  performance or of injunctive  relief is subject
         to the discretion of the court before which any proceeding therefor may
         be brought.

                  (c) The  execution,  delivery and  performance  of this Fourth
         Amendment and the transactions  contemplated  hereby do not require any
         approval  or  consent  of,  or  filing  or   registration   with,   any
         governmental or other agency or authority, or any other party.

                  (d) The  representations  and warranties  contained in ss.5 of
         the Credit  Agreement are true and correct in all material  respects as
         of the date hereof as though made on and as of the date hereof.

                  (e) No Default or Event of Default under the Credit  Agreement
has occurred and is continuing.

         6.  Ratification,  etc. Except as expressly amended hereby,  the Credit
Agreement,  the  other  Loan  Documents  and  all  documents,   instruments  and
agreements related thereto are hereby ratified and confirmed in all respects and
shall  continue in full force and effect.  This Fourth  Amendment and the Credit
Agreement shall hereafter be read and construed  together as a single  document,
and  all  references  in the  Credit  Agreement  or  any  related  agreement  or
instrument to the Credit Agreement shall hereafter refer to the Credit Agreement
as amended by this Fourth Amendment.

         7.  GOVERNING  LAW.  THIS  FOURTH  AMENDMENT  SHALL BE  GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF  MASSACHUSETTS  AND
SHALL TAKE EFFECT AS A SEALED INSTRUMENT IN ACCORDANCE WITH SUCH LAWS.

         8. Counterparts. This Fourth Amendment may be executed in any number of
counterparts and by different parties hereto on separate  counterparts,  each of
which when so executed  and  delivered  shall be an  original,  but all of which
counterparts  taken  together  shall be  deemed to  constitute  one and the same
instrument.


<PAGE>


         IN WITNESS  WHEREOF,  each of the  undersigned  have duly executed this
Fourth Amendment under seal as of the date first set forth above.

                                    The Borrowers:

                                    MASTEC, INC.



                                    By:___________________________________
                                        Name:
                                        Title:




                       [SIGNATURES CONTINUED ON NEXT PAGE]


<PAGE>


                                    B & D CONTRACTORS OF SHELBY, INC.
                                    BURNUP & SIMS OF TEXAS, INC.
                                    HARRISON-WRIGHT CO., INC.
                                    UTILITY PRECAST, INC.
                                    BURNUP & SIMS TELCOM OF FLORIDA, INC.
                                    CHURCH & TOWER ENVIRONMENTAL, INC.
                                    CHURCH & TOWER FIBER TEL, INC.
                                    CHURCH & TOWER, INC.
                                    CHURCH & TOWER OF FLORIDA, INC.
                                    CHURCH & TOWER OF TN, INC.
                                    DESIGNED TRAFFIC INSTALLATION CO.
                                    GDSI, INC.
                                    KENNEDY CABLE CONSTRUCTION, INC.
                                    LATLINK CORPORATION
                                    LATLINK ARGENTINA, INC.
                                    MASTEC COMTEC OF CALIFORNIA, INC.
                                    MASTEC COMTEC OF THE CAROLINAS, INC.
                                    MASTEC TECHNOLOGIES, INC.
                                    MASTEC TELEPORT, INC.
                                    R.D. MOODY & ASSOCIATES, INC.
                                    R.D. MOODY AND ASSOCIATES, INC. OF VIRGINIA
                                    SHANCO CORPORATION
                                    UTILITY LINE MAINTENANCE, INC.
                                    AIDCO, INC.
                                    AIDCO SYSTEMS, INC.
                                    E. L. DALTON & COMPANY, INC.
                                    NORTHLAND CONTRACTING, INC.
                                    WILDE CONSTRUCTION, INC.
                                    WILDE OPTICAL SERVICE, INC.
                                    TELE-COMMUNICATIONS CORPORATION OF VIRGINIA
                                    WILDE ACQUISITION CO., INC.
                                    WILDE HOLDING CO., INC.
                                    WEEKS CONSTRUCTION COMPANY
                                    C & S DIRECTIONAL BORING, INC.
                                    LESSARD-NYREN UTILITIES, INC.
                                    LNU, INC.
                                    S.S.S. CONSTRUCTION, INC.
                                    CONTRACT MANAGEMENT AND ASSISTANCE CORP.
                                    ELECTRONIC EQUIPMENT ANALYZERS, INC.



                                    By:___________________________________
                                        Name:
                                        Title:


<PAGE>


                                    The Banks:

                                    CREDITANSTALT CORPORATE FINANCE, INC.



                                    By:___________________________________
                                        Name:
                                        Title:



                                    By:___________________________________
                                        Name:
                                        Title:

                                    FIRST UNION NATIONAL BANK OF FLORIDA



                                    By:___________________________________
                                        Name:
                                        Title:

                                    SCOTIABANC INC.



                                    By:___________________________________
                                        Name:
                                        Title:

                                    THE FUJI BANK AND TRUST COMPANY



                                    By:___________________________________
                                        Name:
                                        Title:

                                    COMERICA BANK



                                    By:___________________________________
                                        Name:
                                        Title:



<PAGE>



                                    LTCB TRUST COMPANY



                                    By:___________________________________
                                        Name:
                                        Title:

                                    BANKBOSTON, N.A.,
                                      individually and as Agent



                                    By:___________________________________
                                        Name:
                                        Title:



<PAGE>

                          FIFTH AMENDMENT TO REVOLVING
                          CREDIT AGREEMENT AND CONSENT

         THIS FIFTH  AMENDMENT TO REVOLVING  CREDIT  AGREEMENT AND CONSENT (this
"Fifth  Amendment")  is made and  entered  into as of the 29th day of  December,
1998, by and among  MASTEC,  INC., a Florida  corporation  (the  "Parent"),  its
Subsidiaries  (other  than  Excluded  Subsidiaries  and  members  of the  MasTec
International  Group) listed on Schedule 1 to the Credit Agreement defined below
(together  with the Parent,  collectively  the  "Borrowers"),  BANKBOSTON,  N.A.
("BKB"), BANK AUSTRIA CREDITANSTALT CORPORATE FINANCE, INC. (f/k/a Creditanstalt
Corporate Finance,  Inc.), FIRST UNION NATIONAL BANK OF FLORIDA ("First Union"),
SCOTIABANC INC. ("SBI"),  COMERICA BANK, LTCB TRUST COMPANY and LASALLE NATIONAL
BANK (collectively, the "Banks") and BANKBOSTON, N.A. as agent (the "Agent") for
the Banks.

         WHEREAS,  the  Borrowers,  the  Banks  and  the  Agent  entered  into a
Revolving  Credit  Agreement  dated as of June 9,  1997,  as  amended by a First
Amendment to Revolving Credit Agreement dated as of January 28, 1998, as further
amended by a Second Amendment to Revolving Credit Agreement dated as of July 31,
1998, and as further amended by a Third Amendment to Revolving  Credit Agreement
dated as of September  11,  1998,  as further  amended by a Fourth  Amendment to
Revolving  Credit  Agreement  dated as of September 25, 1998 (as the same may be
further  amended  and in  effect  from  time to time  the  "Credit  Agreement"),
pursuant to which the Banks  extended  credit to the  Borrowers on the terms set
forth therein;

         WHEREAS,  the  Parent has  requested  certain  revisions  to the Credit
Agreement, including an increase in the Total Commitment, and the parties desire
to amend the Credit Agreement on the terms set forth herein;

         NOW, THEREFORE,  in consideration of the foregoing,  and for other good
and  valuable  consideration,  the receipt and  sufficiency  of which are hereby
acknowledged, the parties agree to amend the Credit Agreement as follows:

         1. Definitions.  Capitalized terms used herein without definition shall
have the meanings assigned to such terms in the Credit Agreement.

         2. Addition of LaSalle National Bank. LaSalle National Bank ("LaSalle")
by its signature below agrees to become a Bank under the Credit  Agreement,  and
does hereby join and become a party to the Credit Agreement as a Bank, accepting
and assuming the rights and  obligations  of a Bank under the Credit  Agreement.
LaSalle  agrees to comply with, and be bound by, all of the terms and conditions
of the Credit  Agreement in all respects as an original Bank  thereunder,  as if
such Bank were an original  signatory  thereto,  including  without  limitation,
assuming all  responsibilities  and  liabilities  arising or incurred  under the
Credit  Agreement and the Notes on and after the Closing Date.  Without limiting
the above,  LaSalle  hereby  expressly  consents to the terms and  conditions of
ss.23 (Governing Law;  Submission to Jurisdiction) of the Credit Agreement.  The
parties to this Fifth  Amendment agree that this ss.2 shall be deemed to be, and
is hereby made a part of, the Credit Agreement as if set forth therein in full.

         3.  Amendment of ss.1 of the Loan Agreement. Section 1 of the Credit 
Agreement is hereby amended by

         (a) inserting the following  definitions  in their proper  alphabetical
places:

         Aidco Management.  The managers of Aidco, Inc. and Aidco Systems, Inc.

                  Applicable  Base Rate Margin.  The Applicable Base Rate Margin
         on Base Rate  Loans  shall be as set forth in the  Pricing  Table.  Any
         change in the Applicable Base Rate Margin shall become effective on the
         first day of each quarter  which  begins after  receipt by the Banks of
         financial  statements  delivered  pursuant to  ss.6.4(a)  or (b) hereof
         which  indicate  a  change  in the  Pricing  Ratio.  If at any time the
         financial  statements required to be delivered pursuant to ss.6.4(a) or
         (b) hereof are not delivered within the time periods  specified in such
         subsections, the Applicable Base Rate Margin shall be 0.5% with respect
         to any Base Rate  Loan  requested  on or after  the date on which  such
         financial  statements were required to be delivered but before the time
         of actual receipt of such financial  statements,  subject to adjustment
         upon actual receipt of such financial statements.

                  Co-Agent(s).  First Union and SBI.

                  Wilde-Aidco  Bonuses.  Signing bonuses for certain  employees
         of Wilde  Construction,  Inc.,  Wilde Optical  Service, Inc., Wilde 
         Acquisition Co., Inc., Wilde Holding Co., Inc., Aidco, Inc. and Aidco
         Systems, Inc., not to exceed an aggregate amount of $17,500,000.00.

                  Wilde-Aidco Non-Compete Agreement(s). Non-compete agreement(s)
         with certain  members of Wilde  Management and Aidco  Management,  with
         payments under such non-compete agreement(s) not to exceed an aggregate
         amount of $16,000,000.00.

                  Wilde-Aidco Transaction.  The Parent's (a) repurchase in three
         installments  during the period  beginning  December 1, 1998 and ending
         November  30, 1999 of 440,000  shares of its  capital  stock from Aidco
         Management  for  $30.00  per  share,  (b) the  Wilde-Aidco  Non-Compete
         Agreement(s), and (c) the Wilde-Aidco Bonuses.

                  Wilde  Management.  The managers of Wilde  Construction, Inc.,
 Wilde Optical Service,  Inc., Wilde  Acquisition Co., Inc. and Wilde Holding
 Co., Inc."

         and  (b)  deleting  the   definitions  of   "Applicable   L/C  Margin,"
"Applicable  LIBOR  Margin,"   "Collateral,"   "Commitment   Percentage,"  "Loan
Documents,"  and "Pricing  Table" in their  entirety and replacing them with the
following new definitions, inserted in proper alphabetical order:

                  "Applicable  L/C Margin.  The Applicable L/C Margin on Letters
         of Credit  shall be as set forth in the Pricing  Table.  The  effective
         date of a change in the  Applicable  L/C Margin  shall be the first day
         after receipt by the Banks of financial  statements  delivered pursuant
         to  ss.6.4(a)  or (b) hereof  which  indicate  a change in the  Pricing
         Ratio. If at any time the financial statements required to be delivered
         pursuant to ss.6.4(a) or (b) hereof are not  delivered  within the time
         periods specified in such subsections,  the Applicable L/C Margin shall
         be 2.25% with respect to any Letter of Credit  issued after the date on
         which such  financial  statements  were  required to be  delivered  but
         before  actual  receipt  of  such  financial  statements,   subject  to
         adjustment upon actual receipt of such financial statements.

                  Applicable LIBOR Margin.  The Applicable LIBOR Margin on LIBOR
         Loans  shall be as set forth in the  Pricing  Table.  Any change in the
         Applicable LIBOR Margin shall become effective on the first day of each
         Interest  Period which  begins three (3) or more days after  receipt by
         the Banks of financial  statements  delivered  pursuant to ss.6.4(a) or
         (b) hereof which indicate a change in the Pricing Ratio. If at any time
         the financial statements required to be delivered pursuant to ss.6.4(a)
         or (b) hereof are not  delivered  within the time periods  specified in
         such  subsections,  the  Applicable  LIBOR  Margin  shall be 2.25% with
         respect to any LIBOR Loan  requested on or after the date on which such
         financial  statements were required to be delivered but before the time
         of actual receipt of such financial  statements,  subject to adjustment
         upon actual receipt of such financial statements.

                  Collateral. The shares of all direct or indirect Subsidiaries
     of the Parent that are or are intended to be subject to the security 
     interests created by the U.S. Stock Pledge Agreement.

                  Commitment  Percentage.  With  respect to each Bank,  the 
     percentage  set forth  beside its name below  (subject  to adjustment upon
     any assignments pursuant to ss.17):

                      Bank                                          Percentage

                      BKB                                           24.2424%
                      First Union                                   22.7273%
                      SBI                                           15.4545%
                      Comerica                                      10.3030%
                      LTCB                                          10.3030%
                      LaSalle National Bank                          9.0909%
                      Bank Austria Creditanstalt
                        Corporate Finance, Inc.                      7.8788%.

             Loan Documents.  This Agreement,  the Notes, the Letter of Credit 
     Applications,  the Letters of Credit, and the U.S.Stock Pledge Agreement.



<PAGE>



                  Pricing Table:
  ---------------------- ------------- ------------- ------------ --------------
                          Applicable      Applicable    Applicable   Applicable
                     Base Rate Margin  LIBOR Margin  L/C Margin  Commitment Rate
                       (per annum)     (per annum)   per annum)    (per annum)
  Pricing Ratio                                                 
  ---------------------- ------------- ------------- ------------ --------------
  less than 2.00:1          0.00%         1.00%           1.00%         0.250%
  ---------------------- ------------- ------------- ------------ --------------
  greater than or equal     0.00%         1.25%           1.25%         0.250%
  to 2.00:1, but less than 
       2.50:1
  ---------------------- ------------- ------------- ------------ --------------
  greater than or equal     0.00%         1.50%           1.50%         0.375%
  to 2.50:1, but less than
       3.00:1
  ---------------------- ------------- ------------- ------------ --------------
  greater than or equal     0.25%         1.75%           1.75%         0.375%
  to 3.00:1, but less than
       3.50:1
  ---------------------- ------------- ------------- ------------ --------------
  greater than or equal     0.25%         2.00%           2.00%         0.500%
  to 3.50:1, but less than
       4.00:1
  ---------------------- ------------- ------------- ------------ --------------
  greater than or equal     0.50%         2.25%           2.25%         0.500%
  to 4.00:1
  ---------------------- ------------- ------------- ------------ --------------
  
provided that the Applicable L/C Margin for documentary Letters of Credit issued
on or after  December 29, 1998 shall be priced at the  Applicable L/C Margin set
forth in the table above multiplied by 0.5."

         4.  Amendment  to ss.2.1 of the Credit  Agreement.  Section  2.1 of the
Credit Agreement is hereby amended by deleting the figure "$125,000,000" therein
and substituting in place thereof the figure "$165,000,000".

         5.  Amendment to ss.2.4(a) of the Credit  Agreement.  Section 2.4(a) of
the Credit Agreement is hereby amended by deleting ss.2.4(a) in its entirety and
substituting in place thereof the following new ss.2.4(a):

                  "(a) The outstanding  principal amount of the Revolving Credit
         Loans  shall bear  interest at the rate per annum equal to (i) the Base
         Rate plus the  Applicable  Base Rate Margin,  or (ii) at the Borrowers'
         option as provided  herein,  the LIBOR Rate plus the  Applicable  LIBOR
         Margin."

         6.  Amendment to ss.4.1(b) of the Credit  Agreement.  Section 4.1(b) of
the Credit Agreement is hereby amended by deleting ss.4.1(b) in its entirety and
substituting in place thereof the following new ss.4.1(b):

                  "(b) Letter of Credit Fees. The Borrowers shall pay in advance
         on the date of issuance of each Letter of Credit an issuance fee to the
         Agent for its  account  equal to one eighth of one  percent  (1/8%) per
         annum on the  Maximum  Drawing  Amount of each  Letter  of Credit  (the
         "Issuance  Fee").  The Borrowers shall also pay a fee to the Agent (the
         "Letter of Credit  Fee"),  which fee shall be for the  accounts  of the
         Banks in accordance with their respective Commitment Percentages.  With
         respect to each standby Letter of Credit, such fees shall be calculated
         and paid  quarterly in advance on the first Business Day of each fiscal
         quarter  and  equal to the  Applicable  L/C  Margin  multiplied  by the
         Maximum  Drawing  Amount of all  outstanding  Letters of  Credit.  With
         respect  to any  documentary  Letter  of  Credit,  such  fees  shall be
         calculated  based on the Maximum Drawing Amount  thereunder  during the
         period  commencing on the date of issuance  thereof (or with respect to
         documentary  Letters  of  Credit  outstanding  on  December  29,  1998,
         commencing  December  29,  1998)  through  the date of  negotiation  or
         cancellation thereof (calculated on the basis of a 360-day year for the
         actual number of days  elapsed) and shall be payable in arrears  within
         seven (7) Business  Days after the end of each month during  which,  or
         any part of which, such documentary Letter of Credit is outstanding. In
         addition  to the  Issuance  Fee and  the  Letter  of  Credit  Fee,  the
         Borrowers  shall pay to the Agent,  for its own  account,  all  related
         customary  administrative  fees in accordance with customary  practice.
         Notwithstanding  any provision  contained  herein to the  contrary,  no
         fees,  commissions  or other amounts paid as of or prior to December 29
         ,1998 in respect of any Letter of Credit existing as of such date shall
         be repaid or credited against any amounts otherwise payable pursuant to
         this ss.4.1(b)."

         7.  Amendment  to ss.4.9 of the Credit  Agreement.  Section  4.9 of the
Credit  Agreement  is hereby  amended by  deleting  ss.4.9 in its  entirety  and
substituting in place thereof the following new ss.4.9:

                  "ss.4.9 Interest on Overdue Amounts. Overdue principal and (to
         the extent  permitted by applicable  law) interest on the Loans and all
         other overdue amounts payable  hereunder or under any of the other Loan
         Documents shall bear interest  compounded monthly and payable on demand
         at a rate per annum  equal to the Base Rate  plus the  Applicable  Base
         Rate  Margin plus two (2)  percent  until such amount  shall be paid in
         full (after, as well as before, judgment)."

         8.  Amendment to ss.5 of the Credit Agreement.  Section 5 of the Credit
 Agreement is hereby amended by

         (a) adding the following ss.5.21 in its proper place:

                  "5.21.  Year 2000 Issue. The Borrowers and their  Subsidiaries
         have reviewed the areas within their  businesses and  operations  which
         could be adversely  affected by, and have developed or are developing a
         program to address on a timely basis,  the "Year 2000 Issue" (i.e.  the
         risk that computer  applications  used by any of the Borrowers or their
         Subsidiaries   may  be  unable  to  recognize   and  perform   properly
         date-sensitive  functions involving certain dates prior to and any date
         after  December  31,  1999).  Based  upon such  review,  the  Borrowers
         reasonably  believe  that  the  "Year  2000  Issue"  will  not have any
         materially adverse effect on the business or financial condition of any
         of the Borrowers or its Subsidiaries."

         and (b) deleting ss.ss.5.17 and 5.19 in their entirety and substituting
in place thereof the following new ss.ss.5.17 and 5.19:

                  "ss.5.17 Perfection of Security Interests. Except as set forth
         on Schedule 5.17, the Collateral and the Agent's rights with respect to
         the Collateral are not subject to any setoff,  claims,  withholdings or
         other defenses.  The Borrowers and MasTec  International,  Inc. are the
         owners  of the  Collateral  free  from  any  lien,  security  interest,
         encumbrance and any other claim or demand, other than liens in favor of
         the Agent for the benefit of the Banks to secure the  Obligations.  The
         U.S.  Stock  Pledge  Agreement  is  effective to create in favor of the
         Agent,  for the benefit of the Banks,  a legal,  valid and  enforceable
         first priority  security  interest in the Collateral.  The certificates
         for the shares of such Collateral have been delivered to the Agent.

                  ss.5.19  Subsidiaries.  Schedule 1 sets  forth a complete  and
         accurate  list of the direct or  indirect  Subsidiaries  of the Parent,
         including  the  name  of  each  Subsidiary  and  its   jurisdiction  of
         incorporation,  together with the number of authorized and  outstanding
         shares of each  Subsidiary.  All of the  stock of each U.S.  Subsidiary
         (other than the Excluded  Subsidiaries) which is directly or indirectly
         owned by the  Parent  has been  pledged  to the  Agent on behalf of the
         Banks pursuant to the U.S. Stock Pledge Agreement.  The Parent has good
         and  marketable  title to all of the shares it  purports  to own of the
         stock of each such Subsidiary, free and clear in each case of any lien.
         All  such  shares  have  been  duly  issued  and  are  fully  paid  and
         non-assessable.  Each Subsidiary of the Parent, other than the Excluded
         Subsidiaries  and the members of the MasTec  International  Group, is a
         Borrower hereunder."

         9.  Amendment to ss.7.3(e) of the Credit  Agreement.  Section 7.3(e) of
the Credit Agreement is hereby amended by deleting ss.7.3(e) in its entirety and
substituting in place thereof the following new ss.7.3(e):

                  "(e)  Investments  (as defined in ss.1) by any Borrower in any
         affiliate  or  Subsidiary  of a  Borrower  which is not also a Borrower
         (which may include  the MasTec  International  Group or other  non-U.S.
         entities) or in any other Person (i) funded prior to or on December 29,
         1998 and listed on Schedule 7.3(e),  plus (ii) $15,000,000,  plus (iii)
         the net  cash  proceeds  from  the sale of any  Investments  listed  on
         Schedule 7.3(e) and the net cash proceeds from any sale of the stock of
         Sintel;  provided  that the sum of items (i)  through  (iii)  shall not
         exceed $125,000,000."

         10.  Amendment  to ss.7.6 of the Credit  Agreement.  Section 7.6 of the
Credit  Agreement  is hereby  amended by  deleting  ss.7.6 in its  entirety  and
substituting in place thereof the following new ss.7.6:

                  "ss.7.6 Restricted Distributions and Redemptions.  None of the
         Borrowers  may make  Distributions  except as set forth in this ss.7.6.
         Each Borrower may make distributions  payable solely in common stock or
         preferred stock of such Borrower,  subject to the requirement to pledge
         all such stock  pursuant to ss.5.19  hereof.  Borrowers  other than the
         Parent may declare or pay Distributions to the Parent. In addition, the
         Borrowers (other than the Parent) shall not redeem,  convert, retire or
         otherwise  acquire  shares  of any  class  of  capital  stock  of  such
         Borrowers.  The Parent may  declare or pay  dividends  and may  redeem,
         convert,  retire,  or  otherwise  acquire  shares of its capital  stock
         (either directly or via an Equity Purchase Contract), provided that (a)
         prior  to  December  29,  1998,  the  aggregate   amount  of  all  such
         Distributions  by the Parent shall not exceed 50% of  Consolidated  Net
         Income  in any one  fiscal  year,  plus,  for the  fiscal  year  ending
         December 31, 1998 only,  $10,000,000  (which  $10,000,000  shall not be
         reduced by any losses in Consolidated Net Income),  and (b) on or after
         December 29, 1998, the aggregate  amount of all such  Distributions  by
         the  Parent  shall   consist  of  the  Parent's   repurchase  in  three
         installments  from  December  1, 1998 to  November  30, 1999 of 440,000
         shares of its capital stock from Aidco Management for $30.00 per share.
         Notwithstanding   the  above,  none  of  the  Borrowers  may  make  any
         Distribution  under this ss.7.6 if a Default or Event of Default exists
         or would be created by the making of such  Distribution.  The Borrowers
         shall not effect or permit any change in or  amendment  to any document
         or  instrument  pertaining  to  the  terms  of  the  Borrowers'  or the
         International  Signatories'  capital  stock other than the amendment to
         the Parent's  certificate  of  incorporation  increasing the authorized
         amount of common  stock and the par value of the  common  stock and the
         preferred stock."

         11.  Amendment  to ss.7.9 of the Credit  Agreement.  Section 7.9 of the
Credit  Agreement  is hereby  amended by  deleting  ss.7.9 in its  entirety  and
substituting in place thereof the following new ss.7.9:

                  "ss.7.9  [This section intentionally omitted.]"

         12. Amendment to ss.8 of the Credit Agreement.  Section 8 of the Credit
Agreement is hereby amended by deleting  ss.ss.8.1 and 8.3 in their entirety and
substituting in place thereof the following new ss.ss.8.1 and 8.3:

                  "ss.8.1.  Leverage Ratios. As of the end of any fiscal quarter
         of the Borrowers  commencing  with the fiscal  quarter ending March 31,
         1997, (a) the ratio of (i) Senior Debt to (ii) EBITDA for the period of
         four (4)  consecutive  fiscal  quarters  ending on such date  shall not
         exceed 2.50:1,  and (b) the ratio of (i) Funded Debt to (ii) EBITDA for
         the period of four (4) consecutive  fiscal quarters ending on such date
         shall not exceed the ratio set forth opposite such date below:

                     --------------------------------- ------------------------
                                   Date                         Ratio
                     --------------------------------- ------------------------
                              June 30, 1998                    4.50:1      
                     --------------------------------- ------------------------
                            September 30, 1998                 4.50:1          
                     --------------------------------- ------------------------
                            December 31, 1998                  4.00:1          
                     --------------------------------- ------------------------
                              March 31, 1999                   3.50:1         
                     --------------------------------- ------------------------
                              June 30, 1999                    3.25:1        
                     --------------------------------- ------------------------
                          September 30, 1999 and               3.00:1
                                thereafter
                     --------------------------------- ------------------------

                  For purposes of determining compliance with the Funded Debt to
         EBITDA ratio,  but not for purposes of  determining  the Pricing Ratio,
         EBITDA  shall  be  adjusted  to  add  back  pre-tax  charges  taken  in
         connection  with  the  Wilde-Aidco   Transaction,   provided  that  (a)
         PricewaterhouseCoopers  determines  that  the  Parent  must  take  such
         pre-tax  charges in the fiscal quarter ending on December 31, 1998, (b)
         such pre-tax charges are taken in the fiscal quarter ending on December
         31,  1998,  and (c) such  pre-tax  charges do not  exceed an  aggregate
         amount of $33,500,000 (the "Wilde-Aidco Special Charges").

                  ss.8.3.  Interest  Coverage Ratio. As of the end of any fiscal
         quarter of the  Borrowers  commencing  with the fiscal  quarter  ending
         March  31,  1997,  the  ratio of (a) EBIT  for the  period  of four (4)
         consecutive  fiscal  quarters  ending on such date to (b)  Consolidated
         Total Interest Expense for such period shall not be less than the ratio
         set forth opposite such date below:

                     --------------------------------- ------------------------
                                   Date                         Ratio
                     --------------------------------- ------------------------
                              June 30, 1998                    3.50:1      
                     --------------------------------- ------------------------
                            September 30, 1998                 2.50:1          
                     --------------------------------- ------------------------
                            December 31, 1998                  2.50:1          
                     --------------------------------- ------------------------
                              March 31, 1999                   2.75:1          
                     --------------------------------- ------------------------
                              June 30, 1999                    3.00:1          
                     --------------------------------- ------------------------
                            September 30, 1999                 3.25:1          
                     --------------------------------- ------------------------
                           December 31, 1999                   3.50:1           
                     --------------------------------- ------------------------
                                Thereafter                     4.00:1
                     --------------------------------- ------------------------

                  For purposes of  calculating  the EBIT to  Consolidated  Total
         Interest  Expense  ratio,  EBIT  shall  be  adjusted  to add  back  the
         Wilde-Aidco Special Charges."

         13.  Amendment  toss.11 of the Credit  Agreement.  Section  11 of the 
 Credit Agreement is hereby amended by deleting ss.11 in its entirety and 
 substituting in place thereof the following new ss.11:

                  "ss.11.  COLLATERAL SECURITY. The Obligations shall be secured
         by a perfected security interest (having, with respect to each category
         of Collateral,  the  respective  rights and priorities set forth herein
         and in the Stock Pledge  Agreements) in all of the Collateral,  whether
         now  owned or  hereafter  acquired,  pursuant  to the terms of the U.S.
         Stock  Pledge  Agreement.  The  Agent  may from  time to  time,  in its
         discretion,  release  Collateral,  provided that the aggregate value of
         such  released  Collateral  does not exceed  five  percent  (5%) of the
         consolidated  net worth of the Borrowers  determined in accordance with
         GAAP."

     1.  Amendment  toss.14  of the Credit  Agreement.  Section 14 of the Credit
Agreement is hereby amended by adding the following  ss.14.9 to the end thereof:
"ss.14.9.  Co-Agents.  None  of the  Banks  identified  in this  Agreement  as a
"Co-Agent" shall have any right, power, obligation, liability, responsibility or
duty under this  Agreement  other  than those  applicable  to all Banks as such.
Without limiting the foregoing,  none of the Banks so identified as a "Co-Agent"
shall have or be deemed to have any fiduciary  relationship  with any Bank. Each
Bank acknowledges that it has not relied, and will not rely, on any of the Banks
so  identified  in deciding to enter into this  Agreement  or not taking  action
hereunder."

     2.  Amendment  to  Schedules of the Credit  Agreement.  Schedule  7.3(e) is
hereby added to the Credit Agreement in the form attached hereto.

     3.   Consent  to   Wilde-Aidco   Bonuses  and   Non-Compete   Agreement(s).
Notwithstanding  the provisions of ss.5.18 of the Credit Agreement,  each of the
Banks hereby consents to the Wilde-Aidco Bonuses and the Wilde-Aidco Non-Compete
Agreements,  provided that (a) no Default or Event of Default exists or would be
created by the  Wilde-Aidco  Bonuses or the Wilde-Aidco  Non-Compete  Agreements
(other than under ss.5.18), and (b) all other conditions of the Credit Agreement
(other than ss.5.18) be met in connection with the  Wilde-Aidco  Bonuses and the
Wilde-Aidco Non-Compete Agreements.

         4. Consent to Release of Sintel Stock and  Termination  of Sintel Stock
Pledge  Agreement.  Notwithstanding  the  provisions of ss.14.8(h) of the Credit
Agreement,  each of the Banks  hereby  consents  to the  Agent's  release of the
Sintel stock,  and the  termination  of the Sintel Stock  Pledge,  provided that
Sintel shall be sold in  accordance  with the Stock  Purchase  Agreement;  Stock
Purchase Option, Stock Pledge and Shareholder  Agreement dated December 30, 1998
(the "Sale  Agreement").  If for any reason  Sintel is not sold  pursuant to the
Sale  Agreement,  the  Borrowers  agree to re-pledge  the stock of Sintel to the
Agent for the  benefit of the  Banks,  and to execute  any  agreements,  further
assurances or other  instruments in connection  with the re-pledge of the Sintel
stock that the Agent may reasonably request.

         5. Effectiveness. This Fifth Amendment shall become effective as of the
date hereof, subject to the satisfaction of each of the following conditions:

                  (a)  receipt  by the Agent of this  Fifth  Amendment  duly and
         properly  authorized,  executed and delivered by the respective parties
         hereto;

                  (b) the  Borrowers  shall have  executed and  delivered to the
         Agent amended and restated  Notes for each of BKB, First Union and SBI,
         reflecting their revised Commitment Percentages as described in ss.2(b)
         of this Fifth Amendment;

                  (c) the Borrowers  shall have delivered to the Agent certified
         copies of corporate  resolutions of each of the Borrowers  satisfactory
         to the Agent authorizing this Fifth Amendment, the amended and restated
         Notes, and all related documents;

                 (d) payment of all fees due to each Bank pursuant to the terms
         of the separate fee letters dated as of the date hereof; and

                  (e) the Parent shall have delivered to the Agent copies of (i)
         its  charter  or  other  incorporation  documents,   certified  by  the
         Secretary   of  State  of  Florida,   and  (ii)  its   termination   of
         incorporation  documents,  certified  by  the  Secretary  of  State  of
         Delaware, evidencing its changed jurisdiction of incorporation.

     6.  Representations  and Warranties.  Each of the Borrowers  represents and
  warrants as follows:

                  (a) The  execution,  delivery and  performance of each of this
         Fifth Amendment and the transactions contemplated hereby are within the
         corporate power and authority of such Borrower and have been or will be
         authorized by proper corporate proceedings,  and do not (a) require any
         consent  or  approval  of  the  stockholders  of  such  Borrower,   (b)
         contravene  any  provision of the charter  documents or by-laws of such
         Borrower or any law, rule or regulation applicable to such Borrower, or
         (c)  contravene  any provision of, or constitute an event of default or
         event  which,  but for the  requirement  that time  elapse or notice be
         given, or both,  would  constitute an event of default under, any other
         material agreement, instrument or undertaking binding on such Borrower.

                  (b) This Fifth Amendment and the Credit Agreement,  as amended
         as of the date hereof,  and all of the terms and provisions  hereof and
         thereof are the legal,  valid and binding  obligations of such Borrower
         enforceable in accordance with their respective terms except as limited
         by  bankruptcy,  insolvency,  reorganization,  moratorium or other laws
         affecting the enforcement of creditors' rights generally, and except as
         the remedy of specific  performance or of injunctive  relief is subject
         to the discretion of the court before which any proceeding therefor may
         be brought.

                  (c) The  execution,  delivery  and  performance  of this Fifth
         Amendment and the transactions  contemplated  hereby do not require any
         approval  or  consent  of,  or  filing  or   registration   with,   any
         governmental or other agency or authority, or any other party.

                  (d) The  representations  and warranties  contained in ss.5 of
         the Credit  Agreement are true and correct in all material  respects as
         of the date hereof as though made on and as of the date hereof.

                  (e) After giving effect to this Fifth Amendment, no Default or
         Event of  Default  under  the  Credit  Agreement  has  occurred  and is
         continuing.

         7.  Ratification,  etc. Except as expressly amended hereby,  the Credit
Agreement,  the  other  Loan  Documents  and  all  documents,   instruments  and
agreements related thereto are hereby ratified and confirmed in all respects and
shall  continue in full force and effect.  This Fifth  Amendment  and the Credit
Agreement shall hereafter be read and construed  together as a single  document,
and  all  references  in the  Credit  Agreement  or  any  related  agreement  or
instrument to the Credit Agreement shall hereafter refer to the Credit Agreement
as amended by this Fifth Amendment.

         8.  GOVERNING  LAW.  THIS  FIFTH  AMENDMENT  SHALL BE  GOVERNED  BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF  MASSACHUSETTS  AND
SHALL TAKE EFFECT AS A SEALED INSTRUMENT IN ACCORDANCE WITH SUCH LAWS.

         9. Counterparts.  This Fifth Amendment may be executed in any number of
counterparts and by different parties hereto on separate  counterparts,  each of
which when so executed  and  delivered  shall be an  original,  but all of which
counterparts  taken  together  shall be  deemed to  constitute  one and the same
instrument.


<PAGE>


         IN WITNESS  WHEREOF,  each of the  undersigned  have duly executed this
Fifth Amendment under seal as of the date first set forth above.

                                    The Borrowers:

                                    MASTEC, INC.



                                    By:___________________________________
                                        Name:
                                        Title:




                       [SIGNATURES CONTINUED ON NEXT PAGE]


<PAGE>


                                 B & D CONTRACTORS OF SHELBY, INC.
                                 BURNUP & SIMS OF TEXAS, INC.
                                 HARRISON-WRIGHT CO., INC.
                                 UTILITY PRECAST, INC.
                                 BURNUP & SIMS TELCOM OF FLORIDA, INC.
                                 CHURCH & TOWER ENVIRONMENTAL, INC.
                                 CHURCH & TOWER FIBER TEL, INC.
                                 CHURCH & TOWER, INC.
                                 CHURCH & TOWER OF FLORIDA, INC.
                                 CHURCH & TOWER OF TN, INC.
                                 DESIGNED TRAFFIC INSTALLATION CO.
                                 GDSI, INC.
                                 KENNEDY CABLE CONSTRUCTION, INC.
                                 LATLINK CORPORATION
                                 LATLINK ARGENTINA, INC.
                                 MASTEC COMTEC OF CALIFORNIA, INC.
                                 MASTEC COMTEC OF THE CAROLINAS, INC.
                                 MASTEC TECHNOLOGIES, INC.
                                 MASTEC TELEPORT, INC.
                                 R.D. MOODY & ASSOCIATES, INC.
                                 R.D. MOODY AND ASSOCIATES, INC. OF VIRGINIA
                                 SHANCO CORPORATION
                                 UTILITY LINE MAINTENANCE, INC.
                                 AIDCO, INC.
                                 AIDCO SYSTEMS, INC.
                                 E. L. DALTON & COMPANY, INC.
                                 NORTHLAND CONTRACTING, INC.
                                 WILDE CONSTRUCTION, INC.
                                 WILDE OPTICAL SERVICE, INC.
                                 TELE-COMMUNICATIONS CORPORATION OF VIRGINIA
                                 WILDE ACQUISITION CO., INC.
                                 WILDE HOLDING CO., INC.
                                 WEEKS CONSTRUCTION COMPANY
                                 C & S DIRECTIONAL BORING, INC.
                                 LESSARD-NYREN UTILITIES, INC.
                                 LNU, INC.
                                 S.S.S. CONSTRUCTION, INC.
                                 CONTRACT MANAGEMENT AND ASSISTANCE CORP.
                                 ELECTRONIC EQUIPMENT ANALYZERS, INC.
                                 MASTEC NORTH AMERICA, INC.
                                 J.C. ENTERPRISES, INC (d/b/a   Cotton & Taylor)



                                    By:___________________________________
                                        Name:
                                        Title:


<PAGE>


                              The Banks:

                              BANK AUSTRIA CREDITANSTALT CORPORATE FINANCE,
                              INC. (f/k/a Creditanstalt Corporate Finance, Inc.)



                              By:___________________________________
                                  Name:
                                  Title:



                              By:___________________________________
                                  Name:
                                  Title:

                              FIRST UNION NATIONAL BANK OF FLORIDA



                              By:___________________________________
                                  Name:
                                  Title:

                              SCOTIABANC INC.



                              By:___________________________________
                                  Name:
                                  Title:

                              LASALLE NATIONAL BANK



                              By:___________________________________
                                  Name:
                                  Title:

                              COMERICA BANK



                              By:___________________________________
                                  Name:
                                  Title:



<PAGE>



                              LTCB TRUST COMPANY



                              By:___________________________________
                                  Name:
                                  Title:

                              BANKBOSTON, N.A.,
                                individually and as Agent



                              By:___________________________________
                                  Name:
                                  Title:




                                  Exhibit 10.8

         AGREEMENT dated as of November 18, 1998 between MASTEC, INC. (the
                "Company") and JOEL T. CITRON (the "Executive").


                  The  Executive is skilled in financial  matters and  possesses
knowledge of the business, products and operations of the Company. The Executive
and the Company believe that it is in their  respective  interests to enter into
an  employment  agreement  whereby,  for  the  consideration  specified  herein,
including  options to purchase  shares of Common Stock of the Company,  $.10 par
value (the "Common  Stock"),  Executive  shall  provide the  services  specified
herein.

     ACCORDINGLY,  in  consideration  of the mutual  covenants  and  obligations
hereinafter set forth, the parties agree as follows:

SECTION 1.                   EMPLOYMENT OF EXECUTIVE.

                  The Company  hereby  employs the  Executive  and the Executive
hereby accepts such  employment  upon the terms and conditions  hereinafter  set
forth.

SECTION 2.                   TERM.

                  The Executive's  employment  hereunder shall be for the period
(the  "Employment  Period")  commencing  on the date hereof  (the  "Commencement
Date") and ending on (a) the second  anniversary of the date hereof, or (b) such
earlier  date upon which the  employment  of the  Executive  shall  terminate in
accordance with the provisions hereof (the date of termination being hereinafter
called  the  "Termination  Date").  The  Employment  Period may be  extended  by
agreement of the Company and the Executive.

SECTION 3.                   SERVICES; OFFICES.

(a) The Executive shall be the Vice Chairman of the Company. The Executive shall
direct and supervise the finance,  administrative  and mergers and  acquisitions
activities  of the Company.  The  Executive  shall  report only  directly to the
Chairman of the Board of Directors of the Company (the  "Board") or to the Board
as a whole.  The Company  shall  maintain for the  Executive's  exclusive use an
office  at the  Company's  headquarters  facility  in Miami,  Florida  and shall
provide secretarial and other support personnel for the Executive,  in each case
commensurate  with the  Executive's  status as an executive  officer equal to or
higher than all other  executive  officers of the Company with the  exception of
the Chairman of the Company.  The Company  shall also maintain for the Executive
an office in New York City.

(b) The  Company  shall use its best  efforts to assure  that the  Executive  is
elected a member of the Board.  If the  stockholders  of the Company fail during
the  Employment  Period to elect the  Executive as a director or the Board shall
fail to elect him as a member of the  executive  committee of the Board or shall
remove him from that office other than a  Termination  for Cause,  the Executive
shall  continue  to receive the Salary (as  defined  herein)  and the  Executive
Option (as defined herein) pursuant to this Employment Agreement.

SECTION 4.            TIME TO BE DEVOTED TO COMPANY; NO SERVICES FOR COMPETITOR.

                  During the Employment  Period, the Executive shall devote such
working time, attention and energies as he, in his discretion,  deems reasonably
necessary for the business of the Company and any subsidiaries ("Subsidiaries").
The Company  acknowledges  that the  Executive  currently is a director of other
companies and is a consultant to various other  businesses.  The Executive  may,
without  restriction,  carry on his  current  activities  of this nature and any
other  activities  that he  deems  appropriate  during  the  Employment  Period.
However,  notwithstanding  the  foregoing,  the  Executive  shall not during the
Employment  Period be employed by or provide  paid  consulting  services for any
enterprise  engaged in a business that competes with the Company.  The Executive
resides in New York City,  and the  Company  shall not request or require him to
change  residences.  The  Executive  may  from  time  to time  provide  services
hereunder to the Company at its headquarters in Miami,  Florida and at its other
locations.

SECTION 5.                   COMPENSATION; BONUS.

(a) Upon the  execution  hereof,  the  Company  shall  pay to the  Executive  as
compensation for services previously rendered a fee of $100,000.

(b) The Company shall pay to the Executive as compensation for services rendered
during the  Employment  Period a salary of not less than  $300,000 per year (the
"Salary").  The Salary shall be paid in  semi-monthly  installments  of $12,500,
subject  to  withholding  of  taxes  and  other  deductions   required  by  law.
Notwithstanding  anything to the contrary  contained herein,  the Salary payable
for services  rendered  during the first twelve months of the Employment  Period
shall be paid by the Company to the Executive in any event.

(c)        In addition to the Salary, the Company shall pay the Executive a cash
bonus (each, a "Bonus") as follow:

(i) if the price per share of the Common Stock  reaches $26 or more  (determined
in accordance  with clause (f) below) on the last trading day of a calendar year
or for any period of 5 consecutive trading days in the month of December in such
year (the "First Threshold Pricing Period") during the Employment  Period,  then
the Company  shall pay to the  Executive  a Bonus of  $300,000  in January  next
following such year; and

(ii) if the price per share of the Common Stock reaches $30 or more  (determined
in accordance  with clause (f) below) on the last trading day of a calendar year
or for any period of 5 consecutive trading days in the month of December in such
year (the "Second Threshold Pricing Period") during the Employment Period,  then
the Company shall pay to the  Executive an  additional  Bonus of $300,000 (for a
total of $600,000  payable under clauses (i) and (ii) of this  subsection (c) as
Bonuses), in January next following such calendar year; and

(iii) in the event of a Change of Control during the Employment Period or within
180 days thereafter in a transaction  initiated during the Employment Period, if
the  average  sale  price per share of Common  Stock  related  to the  Change of
Control  is $30 or more,  then the  Company  shall pay to the  Executive  at the
initial  closing  of the  Change of  Control,  a Bonus of  $600,000.  "Change of
Control"  means  any  transaction  or any  event  as a result  of which  (A) any
"person"  (as such term is used in  Sections  13(d) and 14(d) of the  Securities
Exchange Act of 1934, as amended (the "Exchange Act")),  other than a trustee or
other fiduciary holding securities under an employee benefit plan of the Company
or its  Subsidiaries  or a corporation  owned,  directly or  indirectly,  by the
stockholders  of the  Company  in  substantially  the same  proportion  as their
ownership  of stock of the  Company,  is or becomes the  "beneficial  owner" (as
defined in Rule 13d-3  under the  Exchange  Age),  directly  or  indirectly,  of
securities  of the Company  representing  [50%] or more of the  combined  voting
power of the Company's then-outstanding  securities; or (B) during any period of
two  consecutive  years (not including any period prior to the execution of this
Employment  Agreement),   individuals  who  at  the  beginning  of  such  period
constitute the Board and any new director (other than a director designated by a
person  who has  entered  into  an  agreement  with  the  Company  to  effect  a
transaction  described in clauses (A) or (C) of this subsection)  whose election
by the Board or  nomination  for  election  by the  Company's  stockholders  was
approved by a vote of at least  two-thirds  (2/3) of the directors then still in
office  who  either  were  directors  at the  beginning  of the  period or whose
election or nomination  for election was  previously so approved,  cease for any
reason to constitute a majority thereof;  or (C) the shareholders of the Company
approve a merger or  consolidation  of the Company  with any other  corporation,
other than a merger or consolidation which would result in the voting securities
of the Company  outstanding  immediately  prior thereto  continuing to represent
(either by remaining outstanding or by being converted into voting securities of
the  surviving  entity) at least 80% of the combined  voting power of the voting
securities of the Company or such surviving entity outstanding immediately after
such  merger  or  consolidation  (either  alone  or in  combination  with new or
additional  voting  securities  held  by  management  of  the  Company  and  its
Subsidiaries  and any trustee or other  fiduciary  holding  securities  under an
employee  benefit  plan  of the  Company  and  its  subsidiaries);  or  (D)  the
shareholders  of the Company approve an agreement for the sale or disposition by
the Company of all or substantially all the Company's assets.

(d) In addition to the Bonuses that may be awarded pursuant to Sections 5(c)(i),
(ii) or (iii)  above,  the  Board  may,  on its own  initiative  and in its sole
discretion,  award cash or other bonuses to the Executive, whether or not any of
the performance thresholds in Section 5(c)(i), (ii) or (iii) are achieved by the
Company.

(e) In the event of a Change of Control, the Company shall pay to the Executive,
immediately  upon the  initial  closing  of the  Change of  Control,  any unpaid
portion  of the  Salary in  respect  of the year in which the  Change of Control
occurs and any bonus earned or awarded pursuant to this Employment  Agreement or
otherwise awarded by the Board

(f) The price for each  share  shall be the Fair  Value of each  share.  As used
herein,  "Fair  Value"  means (i) if the Common  Stock is traded on the New York
Stock Exchange or another public exchange, the average price at which the Common
Stock traded during the 10 trading days immediately prior to the event for which
Fair Value is to be  calculated;  (ii) if the  Common  Stock is  available  only
"over-the-counter,"  the average price at which the Common Stock was sold during
the 10 business days  immediately  prior to the event for which Fair Value is to
be calculated; or (iii) if the Common Stock is not actively traded, its value as
determined in good faith by the Board; provided, however, that if within 10 days
of the  determination  thereof,  the Executive  shall object to such fair market
value  determination,   the  Fair  Value  shall  be  finally  determined  by  an
independent  investment  banking firm  mutually  selected by the Company and the
Executive  (or if such  selection  cannot be made within 10 days after one party
proposes such a firm to the other,  by the American  Arbitration  Association in
accordance with its rules).

SECTION 6.                   BUSINESS EXPENSES; BENEFITS.

(a) The Company shall pay for or reimburse  the  Executive  (at the  Executive's
option),  in accordance with its practice for executive officers of the Company,
all reasonable and necessary  expenses and other  disbursements  incurred by the
Executive  for or on behalf of the  Company  in the  performance  of his  duties
hereunder, including, without limitation, first-class travel (including, but not
limited to, airfare) to and from the Company's office or offices on behalf of or
in  connection  with his  services  for the  Company,  and food and  first-class
lodging  expenses while the Executive is away from home performing  services for
the Company.  The Executive  shall  provide such  appropriate  documentation  of
expenses and  disbursements as may from time to time be reasonably  requested by
the Company.

(b) The  Executive  (and his family) shall be covered under all of the Company's
group health,  dental and disability  plans,  or, at the Company's  option,  the
Company shall reimburse  Executive the cost of obtaining similar  coverage.  (c)
The Company  shall lease,  at its expense,  an  automobile  exclusively  for the
Executive's  use. (d) The  Executive  shall  receive any and all other  benefits
accorded by the Company to executive  officers of the  Company.  (e) The Company
shall pay for any and all attorneys' fees and related  expenses  incurred by the
Executive with respect to the  formulation,  negotiation  and finalizing of this
Employment Agreement.


SECTION 7.                   TERMINATION FOR CAUSE.

(a) The Company may terminate the  employment of the Executive  hereunder at any
time for Cause (as  hereinafter  defined)  (such  termination  being referred to
herein as a "Termination  For Cause") by giving the Executive  written notice of
such termination,  with such termination to take effect upon the receipt of such
notice.  "Cause" means (A) the Executive's  conviction of a crime constituting a
felony or (B) any of the following  performed or caused by the  Executive  which
may reasonably be anticipated  to have a Material  Adverse Effect and which,  if
curable,  remains uncured for a period of fifteen (15) days after written notice
thereof is  delivered  from the  Company to the  Executive:  (i) the willful and
continued  failure to  substantially  perform the duties  described in Section 3
(other than any failure resulting from an illness or other similar incapacity or
disability), (ii) misappropriation of funds, properties or assets of the Company
or any of its subsidiaries,  (iii) commission of a material tort relating to the
Executive's  employment  with the Company and (iv) breach of any fiduciary  duty
owed to the  Company or its  subsidiaries.  "Material  Adverse  Effect"  means a
material  adverse  effect  on the  business,  operations,  financial  condition,
results of operations,  properties, assets or liabilities of the Company and its
Subsidiaries taken as a whole.

(b) Notwithstanding any provisions contained herein to the contrary, in no event
shall the Company  cause a  Termination  for Cause without a prior hearing or at
least 45 days'  notice to the  Executive  and approval of such  Termination  for
Cause by the entire Board.

SECTION 8.                   EFFECT OF TERMINATION FOR CAUSE.

                  Upon the  termination of the Executive's  retention  hereunder
due to  (a) a  Termination  for  Cause  or (b)  the  Executive's  incapacity  or
disability  due to accident,  sickness or otherwise so as to render him mentally
or physically  incapable of performing the services  required to be performed by
him for the Company  for a period of four  consecutive  months,  or for 6 months
during any  twelve-month  period,  neither the Executive nor his  beneficiary or
estate shall have any further  rights or claims  against the Company  under this
Employment  Agreement,  except to receive (i) the unpaid portion, if any, of the
Salary or bonuses provided for in Section 5, computed on a pro rata basis to the
Termination  Date (based on the actual number of days elapsed over a year of 365
or 366 days, as applicable),  (ii)  reimbursement for any expenses for which the
Executive  shall not have been  reimbursed  as  provided in Section 6, and (iii)
rights to the Options (as defined below) as provided in Section 11 hereof.

SECTION 9.                   OPTIONS TO PURCHASE COMMON STOCK OF THE COMPANY

                  The Company hereby  confirms that effective as of November 18,
1998  (the  "Grant  Date")  it,  acting  through  its  Board of  Directors  (the
"Executive Option"), (i) has granted to the Executive, options to purchase up to
250,000  shares of Common  Stock,  pursuant  to a Stock  Option  Agreement  (the
"Executive Option  Agreement") dated November 18, 1998 between the Executive and
the Company, and (ii) has granted to Janine Larkin options (the "Larkin Option")
to  purchase up to 7,500  shares of Common  Stock,  pursuant  to a Stock  Option
Agreement   (together  with  the  Executive   Option   Agreement,   the  "Option
Agreements"),  on the terms and subject to the  conditions set forth in Sections
10 through 13 hereof.  Shares reserved under the Executive Option and the Larkin
Option are called  "Reserved  Shares."  The price for the  Options  per share is
equal to $20.5625,  except for 4,812 shares  granted as incentive  stock options
under the Executive Option Agreement which are issued at $20.7813 per share.

SECTION 10.                  TERM.

              The term of each  Option  commenced  on the  Grant  Date and shall
expire on the seventh  anniversary of the date hereof,  unless such Option shall
theretofore  have been terminated in accordance with the terms of its respective
Option Agreement.

SECTION 11.                  TIME OF EXERCISE.

(a) Unless  accelerated as provided  herein,  the Executive  Option shall become
exercisable  on each date set forth below  (each,  a "Vesting  Date") as to that
number of Reserved Option Shares set forth opposite such Vesting Date:

Vesting Date ..................................... No. of Reserved Option Shares
Grant Date ............................................ 66,110
May 18, 1999 ......................................... 149,564

November 18, 2000 ..................................... 34,326
(b)  The Larkin Option shall be immediately exercisable as of the Grant Date 
(a "Vesting Date").

(c)  Reserved  Option  Shares  which vest under this Section 11 may be purchased
upon exercise of an Option and are called "Vested Option Shares" hereunder.  

(d)  The unvested portion of the Executive Option (i.e.,  that portion which 
does not constitute   Vested  Option  Shares)  shall   terminate  or  accelerate
upon  a termination of the Executive's  employment  with the Company as follows:
  
(i)  in the event (A) that the Executive  voluntarily  terminates his employment
     with the Company  other than a termination  by the Executive  under Section
     3(b) of this Employment  Agreement or under circumstances where the Company
     has not breached or  potentially  breached a provision  of this  Employment
     Agreement,  or (B) of a Termination for Cause,  the unvested portion of the
     Executive Option shall terminate effective immediately.

(ii) in the  event  (A) that the  Executive's  employment  with the  Company  is
     terminated by the Company  without  Cause or (B) the  Executive  dies or is
     incapacitated,   then  the  unvested  portion  of  the  Option  shall  vest
     immediately;  and 

(iii)in the event of a Change of Control of the Company n connection  with which
     the  Executive's  employment  with the Company is terminated by the Company
     for any reason within the twelve-month  period  immediately  following such
     Change of Control,  any unvested portion of the Option shall accelerate and
     vest in full effective as of such termination date.

SECTION 12.              EXECUTIVE'S EMPLOYMENT.

          The Option  shall not be  affected  by any change of duties or
position of the Executive.

SECTION 13.              NOTICES.

                  All notices, claims, certificates, requests, demands and other
communications  relating  hereto shall be in writing and shall be deemed to have
been  duly  given  and  delivered  if   personally   delivered  or  if  sent  by
nationally-recognized overnight courier guaranteeing next business day delivery,
by telecopy,  or by registered or certified mail,  return receipt  requested and
postage prepaid, addressed as follows:

(a)   if to the Company, to:

                         Mastec, Inc.
                         3155 N.W. 77th Avenue
                         Miami, FL  33122-1205
                         Telephone:  305-599-1800
                         Telecopy:    305-406-1818
                         Attention:    Jorge Mas; and

(b)                           if to the Executive, to:

                         Joel T. Citron
                         660 Madison Avenue, 22nd FL
                         New York, New York
                         Telephone:  212-688-7070
                         Telecopy:    212-688-3009

or to such  other  address  as the party to whom  notice is to be given may have
furnished to the other party in writing in accordance herewith.  Any such notice
or  communication  shall be  deemed  to have  been  received  (i) in the case of
personal  delivery,  on the date of such  delivery (or if not  delivered  during
regular  business  hours on such day, on the next business after the date sent),
(ii)  in the  case  of  nationally-recognized  overnight  courier,  on the  next
business  day after the date sent,  (iii) in the case of telecopy  transmission,
when received (or if not received during regular  business hours on such day, on
the next business day after the date sent), and (iv) in the case of mailing,  on
the third business day following that on which the piece of mail containing such
communication is posted.


SECTION 14.                  ENFORCEMENT; SEVERABILITY; ETC.

                  It is the desire and intent of the parties that the provisions
of this Employment Agreement shall be enforced to the fullest extent permissible
under  the  laws and  public  policies  applied  in each  jurisdiction  in which
enforcement  is  sought.  Accordingly,  if  any  particular  provision  of  this
Employment  Agreement shall be adjudicated to be invalid or unenforceable,  such
provision  shall  be  deemed  amended  to  delete  therefrom  the  portion  thus
adjudicated  to be invalid or  unenforceable,  such  deletion to apply only with
respect to the operation of such  provision in the  particular  jurisdiction  in
which such adjudication is made.

SECTION 15.                  BINDING AGREEMENT; BENEFIT.

                  The  provisions of this  Employment  Agreement will be binding
upon,  and  will  inure  to  the  benefit  of,  the  respective   heirs,   legal
representatives, successors and assigns of the parties.

SECTION 16.                  WAIVER OF BREACH.

                  The  waiver by either  party of a breach of any  provision  of
this  Employment  Agreement  must be in  writing  and  shall not  operate  or be
construed as a waiver of any other breach.

SECTION 17.                  ENTIRE AGREEMENT; AMENDMENTS.

                  This  Employment   Agreement  contains  the  entire  agreement
between the parties with respect to the subject matter hereof and supersedes all
prior  agreements or  understandings  between the parties with respect  thereto.
This Employment  Agreement may be amended only by an agreement in writing signed
by the parties.

SECTION 18.                  HEADINGS.

                  The section  headings  contained in this Employment  Agreement
are for  reference  purposes only and shall not affect in any way the meaning or
interpretation of this Employment Agreement.

SECTION 19.                  ASSIGNMENT.

                  This  Employment  Agreement  is personal in its nature and the
parties  shall not,  without the consent of the other,  assign or transfer  this
Employment Agreement or any rights or obligations hereunder;  provided, however,
that the Company may assign this  Employment  Agreement to any of its affiliates
and the provisions of this  Employment  Agreement shall inure to the benefit of,
and  be  binding  upon,  each  successor  of the  Company,  whether  by  merger,
consolidation, transfer of all or substantially all of its assets, or otherwise.

SECTION 20.                  COUNTERPARTS.

                  This Employment Agreement may be executed in counterparts, and
each such counterpart shall be deemed to be an original instrument, but all such
counterparts together shall constitute but one agreement.


<PAGE>

Joel T. Citron



                  IN WITNESS  WHEREOF,  the parties  hereto have  executed  this
Employment Agreement effective as of the date first above written.


                                 MASTEC, INC.


                                 By: /s/ Jorge Mas
                                 -----------------
                                 Name: Jorge Mas
                                 Title: President and Chief Executive Officer

                                 By: /s/ Joel-Tomas Citron
                                 -----------------
                                 Joel-Tomas Citron





                                  Exhibit 10.9

     SHARES  PURCHASE AND SALE WITH  REFERRED  PAYMENT AND  DELIVERY  AGREEMENT,
SHARES PUT OPTION, PROMISE OF SHARES PLEDGE, SHAREHOLDERS AGREEMENT AND OTHERS

With the intervention of Mr. Pedro de Elizalde y Aymerich,  Official Stockbroker
duly authorised to act in Madrid,  ascribed to the Official Stockbrokers College
of Madrid.
In Madrid, December 30, 1998

                                       GATHERED

ON THE ONE SIDE

Mr. Jose Miguel Sariego, married, American lawyer, domiciled in 3155 North West,
77 Avenue  Miami,  Florida,  holder of passport  number  044707068 of the United
States of America.

AND ON THE OTHER SIDE

     Mr.   Francisco   Javier  Martinez  de  Lahidalga   Gonzalez,   of  Spanish
nationality,  of full age,  domiciled in Madrid,  calle  Espalter 6 and with DNI
number 13637114.

     Mr. Juan Antonio  Casanova de San Simon,  of Spanish  nationality,  of full
age, domiciled in Madrid, calle del Arte 21 and with DNI number 41428116.

     Mr. Ricardo Campos Dufaut, of Spanish  nationality,  of full age, domiciled
in Madrid, Paseo de la Habana 20, and with Passport number 05206867.

     Mr. Alfredo Florez Plaza, of Spanish nationality, of full age, domiciled in
Madrid, calle Ibiza 41, and with DNI number 00618808.

     Mr.  Serafin  Gonzalez  Morcillo,  of  Spanish  nationality,  of full  age,
domiciled in Madrid,  calle General Arrando 11, and with DNI number 40251250 and
Mr.  Carlos  Tejera  Osuna of Spanish  nationality,  of full age,  domiciled  in
Madrid, calle General Arrando 11 and with DNI number 2192396.

INTERVENE

     Mr. Jose Miguel Sariego, in the name and on behalf of , as attorney and
Vicepresident  of MasTec  Inc.  (hereinafter  referred to as  "MasTec")  company
validly  incorporated and in force according to the laws of the State of Florida
of the United States of America,  domiciled in 3155 North West, 77 Avenue, Miami
Florida,  he acts by virtue of the power of  attorney  granted  in his favour on
December  29,  1998  before  the Notary  Public of the State of Florida  (United
States) Ms. Patricia Pizzuto, duly appostilled on the same date by the Secretary
of the State of Florida in Tallahassee, Florida under number 1998-16739.

     Mr. Francisco Javier Martinez de Lahidalga  Gonzalez,  as verbal mandatory,
representing the company LAMEGO Holdings Corp., duly incorporated and registered
in the British Virgin Islands.

     Mr. Juan Antonio Casanova de San Simon, as verbal  mandatory,  representing
the
company Fawn Creek,  Ltd, duly incorporated and registered in the British Virgin
Islands.

     Mr. Ricardo Campos Defaut,  as verbal  mandatory,  representing the company
Bending Oak, Ltd,duly incorporated and registered in the British Virgin Islands.

     Mr. Alfredo Florez Plaza,  as verbal  mandatory,  representing  the company
TILPA Trading  Limited,  duly  incorporated and registered in the British Virgin
Islands and as attorney of Sintel  International Corp. BVI, company domiciled in
Omar Hodge Building,  Wickham's Cay, Road Town, Tortola,  British Virgin Islands
validly  incorporated  and in force  according  the laws of the  British  Virgin
Islands.

     Mr. Serafin Gonzalez  Morcillo and Mr. Carlos Tejera Osuna, in the name and
on behalf of, as joint  directors  of the  company  F.G NEWCO,  S.L.  of Spanish
nationality,  domiciled in Madrid,  calle  General  Arrando 11 - 4(0),  with NIF
number  B-81516296 and registered  with the Mercantile  Registry of Madrid under
Volume 11482, Folio 106, Page number M-1802289.

The companies  LAMEGO  Holdings Corp.,  Fawn Creek Ltd,  Bending Oak, Ltd, TILPA
Trading Limited and F.G. NEWCO S.L, will be jointly referred hereinafter as "the
Purchaser".

     Except for Sintel  International  Corp.  BVI, F.G. NEWCO S.L and MasTec Inc
which are acting with the  corresponding  legal capacity,  the remaining parties
will have to ratify this agreement in the shortest term with retroactive effects
as from the date hereof, and


                                     WHEREAS

I.     MasTec is the legal  owner of 1000  shares of 1 cent US dollar  par value
       each,  representing the total share capital of MasTec  International Inc.
       company with  corporate  domicile in Florida,  77 Avenue,  Miami 3155 NW,
       validly  incorporated  and  existing  under  the  laws  of the  State  of
       Delaware.

     TITLE  OF  OWNERSHIP:  deed of  incorporation  of the  company.  
     LIENS  AND ENCUMBRANCES:  the shares are  pledged to the benefit of Bank
     Boston NA as agent and a syndicate of other banks as security for a credit 
     facility.

II.    A call option  agreement (over the shares of MasTec  International  Inc.)
       was  executed on October 15, 1998 as amended on  December  24,  1998,  in
       which the parties to this  agreement  (other  than  Sintel  International
       Corp. BVI) have subrogated.

       The original holder of the call option referred to in the above paragraph
       has waived the same, as states the Purchaser and he accredits by means of
       the Waiver Document attached hereto as Annex No. 3 of this agreement.

III.   MasTec International Inc., Telefonica, S.A. and Sistemas de Instalaciones
       de Telecomunicacion, S.A. (Sintel) have executed prior to this agreement,
       a document of debt acknowledgement and payment commitment a copy of which
       is attached hereto as Annex No. 1.

IV.    Sintel  International  Corp.  BVI,  holds the  shares  or  participations
       representing  the share capital of the entities  Proyco Ltda, a Colombian
       company and Artcom Services, S.A., a company from Puerto Rico.

V.     The Purchaser shall  incorporate the vehicle or vehicles through which it
       will  complete  the  transactions   included  herein  in  the  terms  and
       conditions contained herein.

VI. The parties to this  agreement  wish to implement the terms agreed herein in
accordance with the following

                                     CLAUSES

FIRST.-  PURCHASE AND SALE OF SHARES

MasTec transfers to the Purchaser who acquires,  870 shares  representing 87% of
the share capital of MasTec  International  Inc., referred to under recital I of
this document which will be represented by means of the stock certificates No. 2
to 6 both inclusive which will be delivered as follows:

Stock  certificate no. 2 representing  250 shares to the company LAMEGO Holdings
Corp. who acquires the same.

Stock  certificate no. 3 representing  150 shares to the company Fawn Creek, Ltd
who acquires the same.

Stock  certificate no. 4 representing 200 shares to the company Bending Oak, Ltd
who acquires the same.

Stock  certificate  no. 5  representing  70 shares to the company  TILPA Trading
Limited who acquires the same.

Stock  certificate no. 6 representing  200 shares to the company FG NEWCO,  S.L.
who acquires the same.

SECOND.- PRICE AND DELIVERY OF THE SHARES

2.1  The total price for the shares transferred amounts to 3,869,821,052 pesetas
     distributed as follows:

       Payment of 1,112,017,544 pesetas corresponds to LAMEGO Holdings Corp. for
       the purchase of 25% of the share capital of MasTec International Inc.

       Payment of  667,210,526  pesetas  corresponds  to Fawn Creek Ltd. for the
       purchase of 15% of the share capital of MasTec International Inc.

       Payment of  889,614,035  pesetas  corresponds to Bending Oak Ltd. for the
       purchase of 20% of the share capital of MasTec International Inc.

       Payment of 311,364,912  pesetas  corresponds to TILPA Trading Limited for
       the purchase of 7% of the share capital of MasTec International Inc.

        Payment of  889,614,035  pesetas  corresponds to F.G.  NEWCO,  S.L. for
        the purchase of 20% of the share capital of MasTec International Inc.

2.2    Delivery of the shares shall be effected on January 31, 1999 in the event
       the conditions referred to under clause fourth of this agreement are met;
       in case such  conditions  were not met,  delivery of the shares  shall be
       effected  once they are  accomplished  on February 28, 1999; if they were
       not accomplished in said date delivery will be effected on March 31, 1999
       or April 30, 1999,  as long as the  abovementioned  conditions  have been
       fulfilled.

THIRD.-  PAYMENT OF THE PRICE

Payment of the purchase price will be made as follows:

3.1    The Purchaser pay upon the execution of this agreement, on account of the
       payment of the price,  the amount of  130,500,000  pesetas  which will be
       deposited in the current account number 252529001-24 opened with the bank
       BNP located in c/ Bolivia 28, Madrid.

       The above payment on account is distributed  among the companies  forming
the Purchaser as follows:

       Payment of 37,500,000  pesetas  corresponds to LAMEGO  Holdings Corp. for
       the purchase of 25% of the share capital of MasTec International Inc.

       Payment of  22,500,000  pesetas  corresponds  to Fawn Creek Ltd.  for the
       purchase of 15% of the share capital of MasTec International Inc.

       Payment of  30,000,000  pesetas  corresponds  to Bending Oak Ltd. for the
       purchase of 20% of the share capital of MasTec International Inc.

       Payment of 10,500,000  pesetas  corresponds to TILPA Trading  Limited for
       the purchase of 7% of the share capital of MasTec International Inc.

       Payment of 30,000,000  pesetas  corresponds to F.G. NEWCO, S.L. for the
       purchase of 20% of the share capital of MasTec International Inc.

3.2    Deferred  price will be payable  in four  equal  instalments  (that is of
       934,830,263  pesetas each) on the following  dates:  January 31, February
       28, March 31 and April 30, 1999, free of interest. In case the conditions
       of the following  clause fourth (4.1,  4.2 and 4.3) were not fulfilled on
       January 31, 1999, said payments will be postponed  without interest until
       the date of delivery of the shares  according to the second  clause (2.2)
       above. In this case payments will be made as follows:  (i) if delivery of
       the shares takes place between  March 31 and April 30 1999,  payment will
       be effected within the 10 business days following  delivery of the shares
       except for the  instalment  due on April 30, 1999,  which will be paid on
       such dated;  (ii) if delivery of the shares takes place between  February
       28 and March 31 1999,  payment  will be  effected  within the 10 business
       days  following  delivery of the shares except for the  instalment due on
       March 31 and April 30, 1999,  which will be paid on such dates;  (iii) if
       delivery of the shares  takes place  between  January 31 and February 28,
       payment of the instalment  due on January 31 will be effected  within the
       10  business  days  following  delivery  of the shares and the  remaining
       instalments on its respective maturities.

       Once the conditions of the fourth bellow have been  fulfilled,  the delay
       in payment of the deferred  amounts will accrue an annual  interest of 9%
       as from the last business day of payment until its complete settlement.

       Deferred amounts will be secured by means of a pledge of shares of MasTec
       International Inc., being the promise of pledge regulated under the ninth
       clause of this agreement. Additionally, each of the companies forming the
       so called  Purchaser  guarantees  joint and  severally  with the  vehicle
       company to which this agreement may be assigned, the deferred part of the
       price corresponding to each of them.

3.3    The total or partial  unpayment at the maturity dates established in this
       third  clause  (3.2) will  enable  MasTec to call as due and  payable the
       remaining  instalments  payable by the  defaulting  company  forming  the
       Purchaser,  who will be  obliged to settle  the total  pending  amount of
       payment.

FOURTH.- SUSPENSIVE CONDITIONS AND TERM

The  effectiveness of this purchase and sale is conditioned by the fulfilment by
MasTec,  the  Purchaser  and Sintel  International  Corp.  BVI of the  following
transactions within the term established hereinafter:

4.1    MasTec is  obliged to release  the  shares of MasTec  International  Inc.
       pledged  in favour of Bank  Boston,  N.A.  as agent and other  syndicated
       banks, leaving them free of liens and encumbrances, restrictions or third
       parties rights for delivery to the Purchaser before April 30, 1999.

4.2    Mastec  by itself  and in the name and on behalf of Mastec  International
       Inc. is obliged to release  4,026,000 shares  representing the 66% of the
       share   capital   of   the   company    Sistemas   e   Instalaciones   de
       Telecomunicacion,  S.A.  (Sintel),  domiciled in Madrid, c/ Arte n(0) 21,
       incorporated  by means of the public deed  granted on February 8, 1950 by
       Mr. Jose Luis Diez Pastor and subsequently amended by others, having duly
       adapted its bylaws by means of the public deed dated July 4, 1991, before
       the Notary Public of Madrid,  Mr. Rafael Vallejo  Zapatero,  under number
       3212 of his protocol,  registered with the Mercantile Registry of Madrid,
       volume 1764,  folio 79, page number  M-31898,  entry 250, with CIF number
       A-28/048502,  whose pledge deed was granted on August 29, 1997 before the
       Public Notary of Madrid, Mr. Emilio Villalobos Bernal,  under number 2323
       of his protocol,  ratified by another one granted  before the same Notary
       Public  on  September  17 of the  same  year,  under  number  2448 of his
       protocol,  leaving them free of charges,  restrictions  and third parties
       rights  on the  date in  which  MasTec  delivers  the  shares  of  MasTec
       International Inc to the Purchaser before April 30, 1999.

4.3    MasTec is obliged  to  perform  the  necessary  transactions  so that the
       balance sheet of MasTec  International Inc.'s as of the date in which the
       shares  are   delivered  as   established   under  clause  second  (2.2),
       exclusively  shows  in its  assets  side the  investment  in  Sistemas  e
       Instalaciones de  Telecomunicacion,  S.A.  (Sintel) (the ownership of the
       100% of Sintel) and in  liabilities  side the share  capital and the debt
       owed to Telefonica,  S.A. in the corresponding  amount according to Annex
       No. 1, before April 30, 1999. To these effects,  the Purchaser authorises
       MasTec to dispose of any assets of the company MasTec  International Inc.
       other than the shares of Sistemas e  Instalaciones  de  Telecomunicacion,
       S.A  (Sintel)  obtaining  a balance  formed by the stake in Sintel in the
       assets side and ten  American  dollars  (10US$) of share  capital and the
       debt owed Telefonica, S.A. of Annex n(0) 1 in the liabilities side.

4.4    The  Purchaser is obliged to  incorporate  the  companies,  to be used as
       vehicles for this investment as soon as possible, and guarantees that the
       competent  authority bodies of the same will ratify this agreement in all
       its terms, before delivery of the shares,  transferred hereby, and in any
       case, not later than April 30, 1999.

4.5    Sintel  International  Corp.  BVI will join as subsidiary  100% to MasTec
       International  Inc.  for the  amount of one peseta or will  transfer  its
       participations in the companies  mentioned in recital IV at a price equal
       to their acquisition cost to MasTec  International Inc. immediately after
       delivery of the shares transferred hereby, in such way that they will not
       appear in the balance sheet of MasTec  International  Inc.'s which MasTec
       will deliver to the Purchaser simultaneously with the shares. MasTec does
       not assume any responsibility whatsoever in relation to this transaction.

       In the  event  the  above  transactions  were not  accomplished  and duly
       executed  by  April  30,  1999,  the  purchase  and  sale  and  remaining
       commitments  of this  agreement  will remain without effect and force and
       MasTec  will be  obliged  to return  the  amount of  130,500,000  pesetas
       received from the Purchaser on the immediately following day. None of the
       parties  will be entitled to claim from the others  damages or losses for
       breach of the abovementioned  transactions,  except for the breach or non
       compliance  of any of the  abovementioned  transactions  due to malice or
       negligence  on  the  exclusive  part  of the  party  concerned  with  its
       fulfilment,  whether by action or omission. To such purposes, the parties
       commit themselves to develop the most strict  diligence.  Notwithstanding
       the above,  were the transactions  referred to under clause four (4.1 and
       4.2) of this  agreement not carried out by April 30, 1999,  the Purchaser
       may opt for the abovementioned  termination or for the purchase of 34% of
       the shares of Sistemas e Instalaciones de Telecomunicacion, S.A. (Sintel)
       which  are not  pledged,  for the  proportional  corresponding  price  in
       relation with the purchase  price  established  in this agreement for the
       shares  of  MasTec  International  Inc.  remaining  the  clauses  of this
       document in force whose terms and conditions  will be duly adapted by the
       parties to the new situation if necessary.

       All the  parties  as  owners  of  100% of the  share  capital  of  MasTec
       International Inc will execute the necessary agreements to implement this
       call option.

FIFTH.-  OTHER OBLIGATIONS OF MASTEC

MasTec is obliged to  deliver  together  with the titles of the shares of MasTec
International Inc. a balance sheet of the latter that will be attached hereto as
Annex No. 2 of,  whose  asset side will  exclusively  consist of the 100% of the
share capital of Sintel and whose liability side will exclusively consist of its
share capital of ten (10US$) American  dollars and the owed to Telefonica,  S.A.
as per Annex No. 1.  Likewise,  MasTec is obliged to deliver to the  Purchaser a
"Compilation" prepared by Price Waterhouse Coopers,  Auditors of MasTec, carried
out according to the GAAP of the United  States of America,  and as long as this
documents has not been delivered to the Purchaser, he will be entitled to retain
the last  instalment  of the owed deferred  price  according to the third clause
(3.2) of this document.

MasTec  represents  and  warrants  not  having  notice  of  other   liabilities,
provisioned or not, and that such balance will clearly and  faithfully  show the
economic situation of MasTec  International Inc. according to GAAP of the United
States of America.

MasTec   represents   and  warrants   that  the  balance  sheet  of  Sistemas  e
Instalaciones  de  Telecomunicacion,  S.A.  (Sintel)  as of December  31,  1997,
audited by Arthur  Andersen,  clearly  and  faithfully  shows the  economic  and
financial  situation of this company and its consolidated group as of such date.
MasTec represents that, as far as it is concerned,  the management of Sistemas e
Instalaciones de  Telecomunicacion,  S.A.  (Sintel) during the financial year of
1998 has  been  carried  out in  accordance  with  continuance  and  consistency
criteria  as regards the  financial  year of exercise  1997 and  precedents  and
within the ordinary course of business and,  therefore,  MasTec does not know of
the  existence  of any  liabilities  which  are not going to be  adequately  and
sufficiently accounted or provisioned in the balance sheet closed as of December
31, 1998,  that may cause a patrimonial  damage to Sistemas e  Instalaciones  de
Telecomunicacion,  S.A.  (Sintel);  nevertheless,  MasTec does not guarantee the
non-existence of said liabilities.

Mr. Juan Antonio Casanova de San Simon,  represents and expressly admits to have
had access to all legal,  commercial,  economic  and  financial  information  of
Sintel and furthermore represents that he has a personal and direct knowledge of
the situation of its situation.

MasTec  represents and warrants to the Purchaser that: (i) MasTec  International
Inc.  is validly  incorporated  in force  according  to the laws of the State of
Delaware;  (ii) the shares of MasTec International Inc and the shares of Sintel,
will be the exclusive property of MasTec International Inc.  respectively on the
day of delivery of the shares  according to the second clause  (2.2);  (iii) the
transfer of ownership of the shares of MasTec International Inc, and accordingly
the shares of Sintel are not subject to any  restriction  except for the content
of Annex No. 1; (iv) MasTec International Inc is currently up to date as regards
the fulfilment of its tax obligations  and the payment of the same,  having duly
made the  necessary  provisions  according  to the GAAP of the United  States of
America  until  December 31, 1998,  and Sintel is also up to date as regards its
tax obligations and payment thereof,  having made the necessary legal provisions
in accordance  with GAAP of the Kingdom of Spain and the tax regulating in force
until  December 31, 1997;  v) there are no third party claims apart from that of
Telefonica,  S.A. referred to in Annex No. 1, against MasTec  International Inc,
for  which  provision  has not been  made,  or of  which  the  Purchaser  has no
knowledge  of, nor against  Sintel for which  provision  had not been made as of
December  31, 1997;  vi) neither is MasTec aware of possible  third party claims
against MasTec  International  Inc which might be formulated at a future date in
respect of events  previous to December 31, 1998,  nor against  Sintel by events
previous to December 31, 1997; vii) neither do tax  liabilities  exist in MasTec
International  Inc.,  either in respect of Social Security  payments or pensions
which have not been duly accounted for or provisioned in the balance sheet which
will be delivered  together  with the shares,  nor do tax  liabilities  exist in
respect of Social  Security  payments or pensions in Sintel  which have not been
duly accounted or provisioned in the balance sheet as of December 31, 1997.

MasTec  declares  that it does not  guarantee to the  Purchaser for any economic
deficit  or  liabilities  derived  or  consequence  of  the  application  by the
Purchaser of different accounting criteria or principles which have been applied
by Arthur Andersen,  Auditors of Sistemas e Instalaciones  de  Telecomunicacion,
S.A.  (Sintel)  up to the  December  31,  1997 and which are  included  in their
auditing report corresponding to the accounts of such financial year.

SIXTH.-   RESPONSIBILITY OF MASTEC

MasTec is obliged to pay to MasTec  International  Inc., as the case may be, the
effective  net damage  multiplied  by 0.87,  which is directly  derived  from an
omission  or  inaccuracy  in its  balance  sheet at the date of  delivery of the
shares as a consequence of events or businesses prior to December 31, 1998 or in
the balance sheet of Sistemas e Instalaciones de Telecomunicacion, S.A. (Sintel)
as of December 31, 1997 as a consequence  of events or businesses  prior to such
date, which were not duly accounted for or were not known by the Purchaser up to
a limit equal to eighty per cent (80 %) of the sale price obtained by MasTec.

Effective  damage  is  deemed  to be the net  amount  (after  deduction  of tax)
multiplied  by 0.87 of the  economic  deficit  which  should  have been  legally
accounted  according  to US GAAP if it concerns  the MasTec  International  Inc.
balance  sheet or according to the Spanish GAAP if it concerns the balance sheet
of Sistemas e Instalaciones de Telecomunicacion, S.A. (Sintel) and in both cases
above the threshold agreed upon in the following paragraph.

MasTec will benefit from a threshold of up to forty million (40.000.000) pesetas
for  this  concept.  Therefore,  there  will be no  indemnity  at all as long as
MasTecs  liability  does not exceed such  figure,  when it does exceed said
figure, MasTec will only pay the excess.

Such  liability  will last for one year to be counted as from December 31, 1998,
except for the tax liabilities or Social  Security  payments  liabilities  which
will be extended until their legal  prescription  and except for the liabilities
resulting  from claims or processes in progress as of December 31, 1998 or as of
December 31, 1997 in the case of Sistemas e Instalaciones  de  Telecomunicacion,
S.A.  (Sintel),  in which case the  liability  for such claims or  processes  in
progress will be extended until their  definitive  resolution,  except,  in this
last case, the Telefonica claim referred to in Annex No. 1 for which MasTec will
not be liable whatsoever.

In order for MasTec to be bound to the  compensation  agreed upon hereby it will
be necessary that the following  steps and  requirements  are fulfilled:  i) the
Purchaser  must notify MasTec of the deficit by means of a writ  accompanied  by
the  necessary  documentation  so that MasTec may decide how to proceed;  ii) if
MasTec  accepts  the  claim,  it will  immediately  proceed to pay it, but if it
rejects it, it will be  entitled  to oppose the third  party  claim  bearing the
legal defence and representation  expenses,  including those of the guarantee if
necessary,  the Purchaser  having to collaborate in said defence,  providing the
necessary  information and elements of conviction;  MasTec undertakes to rely on
the active  collaboration  of the  Purchasers  legal advisors;  iii) if the
claim  follows  a  judicial,  extrajudicial  or  administrative  procedure,  the
Purchaser  undertakes  to grant the  necessary  powers of  attorney  in order to
defend  the  interests  of  MasTec in favour  of the  persons  which the  latter
designates.

MasTec is exonerated of all liability for compensation if the Purchaser does not
duly notify the claim or does not fulfil the obligation of providing the defence
and procedural  representation therewith; said notification will be deemed to be
correctly  given  if it is  done  in an  authoritative  manner  at the  location
indicated  in the  thirteenth  clause.  It will also be  exonerated  in case the
Purchaser  waives or accepts a claim or if it  compromises  in another manner or
extrajudicially resolves it without the previous written consent of MasTec.

SEVENTH.-         COMMITMENTS OF THE PURCHASER

7.1        Shareholders Agreement in MasTec International Inc.

The  Purchaser and MasTec hereby agree that the latter will have, in addition to
the legal  protection,  a veto right on  resolutions  relating  to  transactions
involving extraordinary indebtedness,  spin off, dissolution,  liquidation, sale
or  encumbrance  of  the  assets  of  the  company  MasTec   International  Inc.
Notwithstanding the aforementioned,  the consent of MasTec will not be necessary
as regards acts of disposition or encumbrance of assets of MasTec  International
Inc.  whose value or amount does not exceed the figure ten million  (10.000.000)
U.S. dollars, provided always that MasTec International Inc.'s net assets is not
reduced or prejudiced.

The Purchaser and MasTec  furthermore agree that the latter will be informed and
will  have the  right  to,  of his own  choice,  subscribe  to any  shareholders
agreement  that the Purchaser  has intention to subscribe  regarding the company
MasTec International, Inc.

7.2       "Tag-along":

The Purchaser  grants MasTec the right to participate in a percentage of 13 % in
the event of sale of all or part of the shares of MasTec  International  Inc. or
of its assets,  that is to say, its participation in Sistemas e Instalaciones de
Telecomunicacion,  S.A.  (Sintel)  to a  third  party,  in the  same  terms  and
conditions of the other sellers. If the sale or transfer was that of the company
Sistemas e  Instalaciones  de  Telecomunicacion,  S.A.  (Sintel),  the Purchaser
grants  MasTec  the  right to  receive  for its  participation  of 13% in MasTec
International  Inc.,  a price or  compensation  of the 13% of the  value or sale
price received by MasTec International Inc. for the sale of the company Sistemas
e Instalaciones de  Telecomunicacion,  S.A.,  either through the amortisation of
its shares or through the purchase of the same by MasTec International Inc. with
the proportional part of the sale price.

7.3      Positions as Directors:

Mr. Jorge Mas,  American  citizen  holding  Passport  number  044886171  will be
entitled to be appointed  Director of MasTec  International Inc. and Chairman of
the Board of  Directors of Sintel  until  December  31,  2000,  or until the put
option is exercised, as the case may be, referred to in the eighth clause below.
In  such  case,   Mr.  Jorge  Mas  will  enjoy  the   insurances  and  coverages
corresponding  to  the  responsibilities  of  a  Director  which  the  remaining
independent directors of said companies enjoy.

EIGHTH.- PUT OPTION

MasTec is obliged to use its best efforts in order to transfer the total or part
of its share holding in MasTec  International  Inc (13% of its share capital) in
favour of the Mas family,  subject to the legal  requirements  applicable at any
time and to the acceptance of said family.

If in spite of the fact that  MasTec has used its best  efforts to carry out the
abovementioned transfer, it could not be effected, a put option right will arise
offered  from the  Purchaser to MasTec,  who accepts,  over 130 shares of MasTec
International Inc, by representing 13% of its share capital,  represented by the
"Stock  Certificate  No. 7" by virtue of which the  Purchaser  is obliged to buy
said  shares  under  request of MasTec,  who will be able to  exercise  said put
option right on December  31, 1999 or on December 31, 2000.  The sale price will
be of 578,249,123  pesetas plus 7.5% annual  interest as from January 1, 1999 to
December  31,  1999 or 15% annual  interest  if the put option is  exercised  on
December 31, 2000,  calculated  as from January 1, 1999 to December 31, 2000, in
this last case,  depending  on the  exercise  put option.  If MasTec  decides to
exercise  the put option on the  agreed  date,  the  Purchaser  will  receive an
authentic  notification,  appointing a public fedatary for the  formalisation of
the purchase and sale with advance  notice of 15 days. If the Purchaser  totally
or partially  sells to a third party the shares of MasTec  International  or the
shares of Sintel before those dates,  MasTec will be able to exercise in advance
its put option right.

The put option right  referred to in the above  paragraph of this eighth  clause
will be proportionally cancelled in relation to the number of shares transferred
to the Mas family in accordance with the first paragraph of this clause.

If the Purchaser  transferred by means of a public or private tender offer in an
organised market or out of it all or part of its shares in MasTec  International
Inc. or in Sistemas e Instalaciones de Telecomunicacion,  S.A. (Sintel),  MasTec
will have the right to  demand  the  inclusion  of its 13%  shareholding  or the
proportional  part  thereof  in case the  public or  private  tender  offer were
partial.

NINTH.-  PROMISE OF SHARES PLEDGE

The   Purchaser   promises  to  create  a  pledge  over  870  shares  of  MasTec
International  Inc in  favour  of  MasTec,  who will  accept  such  pledge  as a
guarantee of the deferred  payment of the sale price referred to under the third
clause  (3.2) of this  agreement.  The  pledge  will be  formalised  in a public
instrument which will have to be simultaneously granted with the delivery of the
shares as  established  under the second  clause  (2.2) in  accordance  with the
following principles:

The Purchaser will deliver as deposit to MasTec the "Stock Certificates" numbers
2 to 6, inclusive,  issued in favour of the Purchaser,  representing 870 pledged
shares. The Purchaser will expressly  undertake to immediately obtain the pledge
registration in the share registry book of MasTec International Inc. MasTec will
receive in escrow the "Stock Certificates" numbers 2 to 6 inclusive representing
the  pledged  shares and will  cooperate  in all that is  necessary  so that the
Purchaser may exercise the corresponding politic rights.

The Pledge will be extended to all rights (excluding  politic and economic ones)
that may  correspond  to the  pledged  shares  and,  in case there is a delay in
payment of the Purchaser and while the pledge subsists it will be  automatically
extendible to the corporate  profits and other economic rights and to the voting
rights, to which purpose the Purchaser will notify MasTec in writing well before
the holding of the General  Shareholders  Meetings (and informing of the Agenda)
granting  special  power to the  benefit  of MasTec so that it may  attend  such
meeting in its name and representation,  except for the written waiver of MasTec
to this purposes or  authorisation  from MasTec to allow the dilatory  debtor to
attend the meeting having his vote to be agreed upon by MasTec.

The pledge will be indivisible. Consequently, each of the shares will secure the
complete  fulfilment of the  guaranteed  obligation.  The Purchaser will only be
able to request  the  extinction  of the pledge and  further  devolution  of the
holding of the pledged  shares when the deferred  payment  secured has been duly
settled.  MasTec will  reduce the pledge  after  having  received  the  complete
deferred sale price referred to under the third clause (3.2) of this document in
the following way: (i) after the first deferred  payment  instalment,  to shares
representing 63%; (ii) after the second deferred payment  instalment,  to shares
representing 42%; (iii) after the third deferred payment  instalment,  to shares
representing 21% of the share capital of MasTec International Inc.

The pledge will be made  effective  by means of an auction of all or part of the
pledged  shares  before the Notary  Public of Madrid  appointed  by MasTec.  The
Public  Notary  will order the  valuation  of the shares to one of the  auditing
companies of international well known prestige  established in Spain. The Notary
Public will proceed in the following  manner:  (i) he will request the Purchaser
the payment giving him a term of 15 days; (ii) if payment is not effected in the
above term, he will proceed to the  abovementioned  valuation;  (iii) the Notary
Public will notify  MasTec of the number of shares to be auctioned and the value
corresponding  to such  shares,  as well as the  minimum  price of the  bidding,
place,  date and hour of the auction;  and (iv) he will order the  publishing of
the  same  information  in the  BOE  (Boletin  Oficial  del  Estado)  and in two
newspapers of wide circulation in Madrid at least 10 days in advance.  The price
in the first auction will be at least the minimum bidding price or valuation; in
the second  auction the minimum price of the bidding will be equal to 25% of the
first auction price; no minimum price will be established for the third auction.
Anyone  wishing to  participate  in the auction will have to deposit  before the
Notary  Public 20% of the minimum  value of the  bidding for the first  auction.
These  amounts will be  reimbursed  to the persons who have not been awarded the
shares when the auction is finished.  The auction  will take place by bids.  The
bidder  will pay the  difference  up to the  final  price at the  moment  of the
assignation.  If the highest bidder does not pay the price,  the auction will be
reinitiated.  Once the shares are  assigned to the highest  bidder,  MasTec will
receive  payment for its debts credit and after the expenses of the auction have
been liquidated the remaining amount, if any, will be paid to the Purchaser. The
purchase  and sale deed in favour of the highest  bidder will be granted  before
the same Notary Public on behalf of the Purchaser.  In the event the shares were
not sold in the first  auction,  a second  auction will be called and likewise a
further third auction.  Each calling will be done as stated beforehand.  In case
the balance  obtained  during the auction was  insufficient to cover the secured
debt,  each of the  purchasers  forming the Purchaser  will be liable with their
patrimony of the difference corresponding to them.

TENTH.-                  ASSIGNMENT OF THE AGREEMENT

MasTec and the Purchaser may assign their respective  contractual positions to a
third party with the prior  written  consent from the other  party,  who may not
unreasonably withheld it in accordance with the ordinary business practice.  The
Purchaser  acquires  for itself or on behalf of a  corporate  entity or entities
owned by itself which will be designated with such prior consent,  so that there
will only be one transfer of the ownership of the shares  transmitted which will
be effected directly from MasTec to the entity or entities finally designated by
the Purchaser.

ELEVENTH.-                MANAGEMENT OF MASTEC INTERNATIONAL INC AND SINTEL

MasTec  undertakes  to abstain  from  intervening  in the  management  of MasTec
International Inc. and Sintel, entrusting the latter to the Managing Director of
Sintel,  Mr. Juan Antonio Casanova de San Simon, who will carry it out according
to the  instructions  of the  Purchaser,  who will always take into  account the
temporary  nature of the  situation,  until the  fulfilment of the  transactions
referred to under the fourth clause of this  document and  therefore  abstaining
from performing transactions outside the ordinary course of business.

TWELFTH.-               DEBT OWED TO TELEFONICA

The debt of MasTec  International Inc. to Telefonica,  S.A. for the purchase and
sale of the  shares  of  Sistemas  e  Instalaciones  de  Telecomunicacion,  S.A.
(Sintel)  documented  in the Public Deed,  granted  before the Notary  Public of
Madrid Mr. Jose Luis Figuerola  Cerdan,  on April 30, 1996, under number 1107 of
this protocol,  whose amount and details appear in the novation  agreement which
is attached as Annex No.1 to this  agreement,  will be satisfied  in  accordance
with its own terms.

THIRTEENTH.-             NOTIFICATIONS

Any   notification   will  be  made  in  writing,   by   registered   mail  will
acknowledgement of receipt to the following addresses:

MasTec
MasTec Inc
3155 N.W. 77 Avenue
Miami Florida 33122
Attention:  Mr Jorge Mas

Copy to:
MasTec Inc
3155 N.W. 77 Avenue
Miami Florida 33122
Attention:  Mr Jose Sariego
Legal Department

The Purchaser
Sintel c/Arte n(0) 21
MADRID
Attention:  Mr Juan Antonio Casanova de San Simon

The parties are able to change address by giving prior notification to the other
party.

FOURTEENTH.-      TAX AND EXPENSES

The Purchaser and MasTec will each bear half of all expenses and taxes  incurred
in the granting and fulfilment of this agreement.

FIFTEENTH.-       LAW AND JURISDICTION

This agreement will be governed and construed in accordance to Spanish Law.

The parties submit  themselves to the  jurisdiction  of the Courts of Madrid and
expressly  renounce to any other  jurisdiction  which may correspond to them, as
regards any matter relating to this agreement.



                                MERCANTILE POLICY

This  agreement  and the eventual  amendments  thereto,  will be formalised as a
Policy intervened by Public Fedatary  (Fedatario  Publico) with the aim that all
due  amounts  due  under  the same are  qualified  as a Public  Deed Debt to all
effects  foreseen  in  Article  1429,6(0)  of the  Civil  Procedure  Law (Ley de
Enjuiciamiento  Civil) and Articles 913.4(0) and 914.2(0) of the Commercial Code
(Codigo de  Comercio)  in relation  to Article  916.2 of the same Code and other
applicable legal provisions.

This agreement is formalised as a Policy formed of a principal body of [ ] pages
and 3 Annexes of [ ] pages in 7 original documents.

THE PARTIES WHILE EXECUTING THE LAST PAGE MANIFEST THEIR FULL AGREEMENT WITH THE
ENTIRE CONTENT OF THIS  DOCUMENT,  for the  acknowledgement  of which the Public
Fedatary  intervenes,  attesting to the identity and capacity of the Parties, to
the  legitimacy of their  signatures  and to all that is agreed in the agreement
and having  made the legal  observations,  particularly,  the need to ratify the
intervention of the verbal mandatories, seals and signs all the pages, giving to
all the  counterparts  an  original  value and full  Mercantile  and  Procedural
effects.


- -------------------------
Signed Mr Jose Miguel Sariego
MASTEC INC.


- --------------------------------             ------------------------------
Signed Mr Francisco Javier Martinez de        Signed Mr Juan Antonio Casanova
Lahidalga Gonzalez                                   de San Simon
LAMEGO HOLDINGS CORP.                         FAWN CREEK, LTD.


- --------------------------------                  -----------------------------
Signed Mr Ricardo Campos Dufaut               Signed Mr Alfredo Florez Plaza
BENDING OAK, LTD.                             TILPA TRADING LTD


- --------------------------------
Signed Mr Serafin Gonzalez Morcillo
Signed Mr Carlos Tejera Osuna
F.G. NEWCO, S.L.

- --------------------------------
Signed Mr Alfredo Florez Plaza
SINTEL INTERNATIONAL CORP. BVI



                           Intervening Public Fedatary
              With my intervention, Mr Pedro de Elizalde y Aymerich

<PAGE>


                                     ANNEX 1

                           ACKNOWLEDGEMENT OF DEBT AND
                          PAYMENT UNDERTAKING AGREEMENT


                                     ANNEX 2

                   BALANCE SHEET OF MASTEC INTERNATIONAL INC.


                                     ANNEX 3

                           WAIVER OF CALL OPTION RIGHT




                                  Exhibit 21.1


Set forth below is a list of the significant subsidiaries of MasTec.

MasTec North America, Inc.
MasTec Latin America, Inc.
MasTec Inepar S/A Sistemas de Telecomunicacoes
LatLink Corporation





                                  Exhibit 23.1



                       CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the  incorporation by reference to the registration  statements of
MasTec, Inc. (the "Company") on Post-Effective Amendment No. 1 to Form S-3 (File
Nos. 333-11013 and 333-46067),  Post-Effective  Amendment No. 1 to Form S-4 File
No.  333-30645,  and  Post-Effective  Amendment  No.  1 to Form S-8  (File  Nos.
033-55327,  333-30647,  333-47003  and  333-22465) of our report dated March 31,
1999, on our audits of the consolidated financial statements of Sintel, S.A. and
subsidiaries  as of December  31, 1997 and 1998 and for each of the two years in
the period  ended  December  31,  1998,  which report is included in this Annual
Report on Form 10-K.



/s/ ARTHUR ANDERSEN LLP
- -----------------------
ARTHUR ANDERSEN LLP
Madrid, Spain
March 31, 1999




                                  Exhibit 23.2



                       CONSENT OF INDEPENDENT ACCOUNTANTS





     We consent to the incorporation by reference to the registration statements
of MasTec,  Inc. (the "Company") on  Post-Effective  Amendment No. 1 to Form S-3
(File Nos. 333-11013 and 333-46067),  Post-Effective Amendment No. 1 to Form S-4
File No. 333-30645,  and  Post-Effective  Amendment No. 1 to Form S-8 (File Nos.
033-55327,  333-30647, 333-47003 and 333-22465) of our report dated February 10,
1999, on our audits of the consolidated  financial  statements of the Company as
of  December  31,  1997 and 1998 and for each of the three  years in the  period
ended December 31, 1998,  which report is included in this Annual Report on Form
10-K.





/s/ PRICEWATERHOUSECOOPERS LLP
- ------------------------------
PRICEWATERHOUSECOOPERS LLP
Miami, Florida
March 31, 1999


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
     THIS SCHEDULE  CONTAINS SUMMARY  FINANCIAL  INFORMATION  EXTRACTED FROM THE
ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 1998 AND IS QUALIFIED
IN ITS ENTRIETY BY REFERENCE TO SUCH ANNUAL REPORT ON FORM 10-K.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                          19,864
<SECURITIES>                                         0
<RECEIVABLES>                                  291,875
<ALLOWANCES>                                     7,300
<INVENTORY>                                     13,423
<CURRENT-ASSETS>                               427,436
<PP&E>                                         201,762
<DEPRECIATION>                                  58,865
<TOTAL-ASSETS>                                 735,486
<CURRENT-LIABILITIES>                          182,932
<BONDS>                                        199,750
                                0
                                          0
<COMMON>                                         2,738
<OTHER-SE>                                     201,535
<TOTAL-LIABILITY-AND-EQUITY>                   735,486
<SALES>                                      1,048,922
<TOTAL-REVENUES>                             1,048,922
<CGS>                                          803,112
<TOTAL-COSTS>                                  217,550
<OTHER-EXPENSES>                                 5,155
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              20,487
<INCOME-PRETAX>                                  2,618
<INCOME-TAX>                                    12,550
<INCOME-CONTINUING>                            (13,915)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (13,915)
<EPS-PRIMARY>                                    (0.51)
<EPS-DILUTED>                                    (0.51)
        

</TABLE>



                                  EXHIBIT 99.1

             CAUTIONARY STATEMENTS REGARDING SAFE HARBOR PROVISIONS
             OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

     The  Company is filing  this  cautionary  statement  identifying  important
factors that could cause the Company's actual results to differ  materially from
those  projected  in forward  looking  statements  of the Company made by, or on
behalf of, the Company.

Dependence on Key Customers and the Telecommunications Industry

     The Company derives a substantial  portion of its revenue from customers in
the telecommunications industry, particularly BellSouth. The Company anticipates
that it will  continue  to derive a  significant  portion  of its  revenue  from
services  performed  for  customers  in  the  telecommunications   industry  and
specifically  BellSouth.  The loss of BellSouth  as a customer or a  significant
reduction in the aggregate amount of business generated by these customers could
have a material adverse effect on the Company's results of operations.

     In  addition,  there are a number of factors  that could  adversely  affect
these and the Company's other customers and their ability or willingness to fund
capital  expenditures in the future, which in turn could have a material adverse
effect on the  Company's  results  of  operations.  These  factors  include  the
potential  adverse  nature  of,  or  the  uncertainty   caused  by,  changes  in
governmental regulation,  technological changes, increased competition,  adverse
financing  conditions  for  the  industry  and  economic  conditions  generally.
Further,  the volume of work awarded under  contracts with the Company's  public
utility customers is subject to periodic  appropriations  during the term of the
contract,  and a failure by the  customer to receive  sufficient  appropriations
could  result in a reduction  in the volume of work under these  contracts  or a
delay in payments, which in turn could negatively affect the Company.

Risks Inherent in Growth Strategy

     The Company has grown rapidly  through the  acquisition of other  companies
and its growth  strategy is dependent in part on  additional  acquisitions.  The
Company  anticipates  that it will make additional  acquisitions and is actively
seeking and evaluating  new  acquisition  candidates.  There can be no assurance
that the Company  will be able to continue to identify  and acquire  appropriate
businesses or obtain  financing for  acquisitions on satisfactory  terms or that
acquired  companies  will perform as expected.  The  Company's  growth  strategy
presents the risks inherent in assessing the value,  strengths and weaknesses of
growth opportunities, in evaluating the costs and uncertain returns of expanding
the operations of the Company and in integrating  existing  operations  with new
acquisitions.  Future competition for acquisition  candidates could raise prices
for these targets and lengthen the time period  required to recoup the Company's
investment.  The  Company's  growth  strategy  also  assumes  there  will  be  a
significant increase in demand for  telecommunications  and other infrastructure
services, which may not materialize.  The Company's anticipated growth may place
significant demands on the Company's  management and its operational,  financial
and  marketing  resources.  The Company's  operating  results could be adversely
affected  if  it  is  unable  to  integrate   and  manage   acquired   companies
successfully.  Future  acquisitions  by the  Company  could  also  result in the
incurrence of  additional  debt and  contingent  liabilities,  and  amortization
expenses related to goodwill and other intangible assets, which could materially
adversely affect the Company's financial condition and results of operations.


Risks of Foreign Operations

     Some  of  the  countries  in  which  the  Company  conducts   business  are
experiencing  or have  experienced  political,  economic or social  instability,
including expropriations, currency devaluations,  hyper-inflation,  confiscatory
taxation  or other  adverse  regulatory  or  legislative  developments,  or have
limited the repatriation of investment income,  capital and other assets.  There
can be no  assurance  that  some of these  circumstances  will not  occur in the
future or that, if they occur,  they will not have a material  adverse effect on
the Company's financial condition and results of operations.

     The  Company  conducts  business  in several  foreign  currencies  that are
subject to  fluctuations in the exchange rate relative to the U.S.  dollar.  The
Company's results of operations from foreign activities are translated into U.S.
dollars at the average  prevailing rates of exchange during the period reported,
which  average  rates may differ from the actual  rates of exchange in effect at
the time of actual  conversion  into U.S.  dollars.  The  Company  monitors  its
currency exchange risk but currently does not hedge against this risk. There can
be no assurance that currency  exchange  fluctuations  will not adversely affect
the Company's financial condition or results of operations.

Dependence on Labor Force

     The Company's  business is labor  intensive with high employee  turnover in
many operations. The low unemployment rate in the United States has made it more
difficult  to find  qualified  personnel  at low cost in some  areas  where  the
Company  operates.  Shortages  of labor or  increased  labor  costs could have a
material adverse effect on the Company's  operations.  There can be no assurance
that the Company will be able to continue to hire and retain a sufficient  labor
force of qualified persons.

Dependence on Management

     The Company's businesses are managed by a small number of key executive and
operational officers, including Jorge Mas, the Company's Chairman, President and
Chief Executive Officer, Joel-Tomas Citron, the Company's Vice Chairman, and the
Company's  service  line  presidents.  The loss of  services of certain of these
executives and managers could have a material adverse effect on the Company. The
Company's  growth  strategy  also is dependent on its ability to hire and retain
additional  qualified management  personnel.  There can be no assurance that the
Company will be able to hire and retain such personnel.

Technological Changes

     The telecommunications  industry is subject to rapid changes in technology.
Wireline  systems  used for the  transmission  of  video,  voice  and data  face
potential displacement by various technologies,  including wireless technologies
such as  direct  broadcast  satellite  television  and  cellular  telephony.  An
increase  in the use of such  technologies  could,  over the long term,  have an
adverse effect on the Company's wireline operations.

Seasonality; Variability of Quarterly Results

     The Company's external network services business is subject to seasonality,
with the Company experiencing a reduction in revenue during the first and fourth
quarters  relative to other  quarters.  This reduction is due, in large part, to
reduced expenditures and work order requests of the Company's telecommunications
and  other  utility  customers,  particularly  the  ILEC's,  at the end of their
budgetary  years,  which  typically  end in  December.  The onset of winter also
affects the Company's  ability to render external networks in certain regions of
the United States.

     The Company may experience  variances in quarterly results as a consequence
of winning major contracts,  which typically require significant  start-up costs
in one  period  and  realization  of  the  benefit  of  contractual  revenue  in
subsequent  periods,  or as a result of the  completion of major  contracts.  In
addition,  the  amount  and type of work  performed  at any  given  time and the
general  mix  of  customers   for  which  work  is  being   performed  can  vary
significantly from quarter to quarter, which also may affect quarterly results.

Short-Term Nature of Contracts; Failure to Renew or Win Bids

     A  significant  portion  of  the  Company's  services  are  provided  on  a
non-recurring,  project by project  basis under  contracts of  relatively  short
duration, typically less than one year. Many of the Company's contracts with its
customers,  including most of its master contracts and contracts with its public
utility customers, are subject to cancellation by the customer without notice or
on relatively short notice, typically 90 to 180 days, even if the Company is not
in default under the contract. Many of the Company's contracts, including master
contracts, also are opened to public bid at the expiration of the contract term,
and there can be no assurance that the Company will be the successful  bidder on
existing contracts that come up for bid. Cancellation of a significant number of
contracts  by the  Company's  customers  or the  failure of the Company to win a
significant  number of  existing  contracts  upon  re-bid  could have a material
adverse effect on the Company.

Disposal of Non-Core Assets

     The Company  currently  has  investments  in a number of  non-core  assets,
including   non-operating  real  estate,  an  interest  in  an  Argentine  cable
television  operator,  an interest in an Ecuadorian  cellular telephone company,
and a voice and data  teleport  facility.  The  Company is  exploring  strategic
alternatives  to maximize the value of these  assets.  There can be no assurance
that the Company will be successful in achieving  any proposed  alternatives  or
that the achievement of any proposed  alternatives would not result in a charge,
loss or tax liability.

Controlling Shareholders

     Jorge Mas, the Company's  Chairman,  President and Chief Executive Officer,
and other  family  members  beneficially  own more  than 50% of the  outstanding
shares  of  Common  Stock of the  Company.  Accordingly,  they have the power to
control the affairs of the Company.

Restrictions Imposed By Credit Facility and Senior Notes

     The  Credit  Facility  and the Senior  Notes  contain  customary  events of
default and covenants  which  prohibit the Company,  among other things,  making
investments in excess of specified amounts, incurring additional indebtedness in
excess of a specified amount,  paying dividends in excess of a specified amount,
making capital  expenditures  in excess of a specified  amount,  creating liens,
prepaying other indebtedness, including the Senior Notes and engaging in certain
margins or combinations  without the prior written  consent of the lenders.  The
Credit Facility also provides that the Company must maintain  certain  financial
ratio coverage, requiring, among other things, minimum ratios at the end of each
fiscal quarter of debt to earnings and earnings to interest expense. The ability
of the Company to comply with such provisions may be affected by events that are
beyond the Company's control.  The breach of any of these covenants could result
in a default  under the Credit  Facility  and the Senior Notes  indenture  and a
subsequent acceleration of such indebtedness.  In addition, as a result of these
covenants,  the  ability of the  Company to respond  to  changing  business  and
economic  conditions  and to secure  additional  financing,  if  needed,  may be
restricted  significantly,  and the Company may be  prevented  from  engaging in
transactions that might otherwise be considered beneficial to the Company.


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