EXHIBIT 4.5

                                 TELIGENT, INC.
                        1999 EMPLOYEE STOCK PURCHASE PLAN

9. PURPOSE.

          The purpose of the Teligent,  Inc. 1999 Employee  Stock  Purchase Plan
(the "Plan") is to provide  employees of Teligent,  Inc. (the "Company") and its
Designated  Subsidiaries  with an  opportunity  to  acquire an  interest  in the
Company  through the purchase of Class A Common  Stock of the Company,  $.01 par
value per share (the "Common Stock"),  with accumulated payroll deductions.  The
Company  intends the Plan to qualify as an "employee stock purchase plan" within
the meaning of Section 423 of the Internal Revenue Code of 1986, as amended (the
"Code"),  and  the  provisions  of the  Plan  shall  be  construed  in a  manner
consistent with the requirements of Section 423 of the Code.

10. DEFINITIONS.

"Authorization  Form" shall mean a form supplied by and delivered to the Company
by a  Participant  in the  form  of  Attachment  A  hereto  authorizing  payroll
deductions as set forth in Section 5 hereof and such other terms and  conditions
as the Company from time to time may determine.

"Board" shall mean the Board of Directors of the Company.

"Committee"  shall  mean a  committee  of at least  three  members  of the Board
appointed by the Board to  administer  the Plan and to perform the functions set
forth  herein and who are  "non-employee  directors"  within the meaning of Rule
16b-3 as  promulgated  under Section 16 of the  Securities  Exchange Act of 1934
(the "Exchange Act").

"Compensation"  shall  mean  the base  salary  or wage  (including  commissions)
payable by the Company to an Employee, including an Employee's portion of salary
deferral  contributions  pursuant  to Section  401(k) of the Code and any amount
excludable  pursuant to Section 125 of the Code,  but excluding any bonus,  fee,
overtime pay, severance pay, or other special emolument or any credit or benefit
under any employee plan maintained by the Company.

"Designated  Subsidiaries"  shall mean all Subsidiaries  designated by the Board
from time to time, in its sole  discretion,  as eligible to  participate  in the
Plan.

"Eligible Employee",  shall mean any Employee excluding: (i) any Employee who is
customarily  scheduled  to work 20 hours per week or less and (ii) any  Employee
who  customarily  is employed  for not more than five (5) months in any calendar
year.

"Employee"  shall  mean any  person,  including  an  officer,  who is  regularly
employed by the Company or one of its Designated Subsidiaries.

"Exercise  Date" shall mean,  with  respect to each  Offering  Period,  the last
business day prior to the next  Offering Date in which  payroll  deductions  are
made under the Plan.

"Fair  Market  Value"  per share as of a  particular  date  shall  mean the last
reported  sale price (on that date) of the Common  Stock on The Nasdaq  National
Market.

"Offering  Date" shall mean the first  business  day of January and July of each
plan  year,  provided  that the  Committee  shall  have the power to change  the
Offering Date.

"Offering  Period" shall mean a period of time during the  effectiveness  of the
Plan, commencing on each Offering Date and ending on the Exercise Date thereof.

"Participant" shall mean an Employee who participates in the Plan.

"Plan Year" shall mean, for the first year the period  beginning on July 1, 1999
and ending on December 31,  1999,  and for each year  thereafter  shall mean the
period beginning on January 1 and ending on December 31.

"Subsidiary" shall mean any corporation,  if any, having the relationship to the
Company described in Section 424(f) of the Code.

11. ELIGIBILITY AND PARTICIPATION.

          Any person who is an Eligible  Employee  on an Offering  Date shall be
eligible to become a Participant in the Plan beginning on that Offering Date and
shall  become  a  Participant   as  of  that  Offering  Date  by  completing  an
Authorization  Form and filing it with the  Company by the date  required by the
Company.  Such  authorization  will  remain in effect  for  subsequent  Offering
Periods,  until modified or terminated by the Participant.

          Any person who first becomes an Eligible  Employee  during an Offering
Period shall be eligible to become a Participant in the Plan as of the first day
of the Offering  Date  beginning  after the date on which that person  became an
Eligible  Employee and shall become a Participant  as of such date by completing
an Authorization Form and filing it with the Company by the date required by the
Company.  Such  authorization  will  remain in effect  for  subsequent  Offering
Periods, until modified or terminated by the Participant.

          A person  shall cease to be a  Participant  upon the earliest to occur
of: the date the Participant ceases to be an Eligible Employee,  for any reason;
the  first  day of the  Offering  Period  beginning  after the date on which the
Participant  ceases  payroll  deductions  under  the  Plan;  or  the  date  of a
withdrawal from the Plan by the Participant.

12. GRANT OF OPTION.

          On each Offering  Date the Company shall grant each Eligible  Employee
an option to purchase  shares of Common Stock,  subject to the  limitations  set
forth in Sections 3.b, 3.c and 10 hereof.

          The option price per share of the Common Stock  subject to an offering
shall be the lesser of: (i)  eighty-five  percent (85%) of the Fair Market Value
of a share of Common  Stock on the  Offering  Date or (ii)  eighty-five  percent
(85%) of the Fair Market Value of a share of Common Stock on the Exercise  Date.
No  Participant  shall be granted an option which permits his rights to purchase
Common Stock under all employee stock purchase plans of the Company to accrue at
a rate which  exceeds  $25,000  of the Fair  Market  Value of the  Common  Stock
(determined  at the time the option is granted) for each  calendar year in which
such stock option is outstanding at any time.

          No  Participant  may be granted an option if,  upon such  grant,  such
Participant  would own  immediately  after the grant of an option under the Plan
and  applying  the  rules of  Section  424(d) of the Code in  determining  stock
ownership shares, and/or hold outstanding options to purchase shares, possessing
five  percent  (5%) or more of the total  combined  voting power or value of all
classes of shares of the Company.

13. PAYROLL DEDUCTIONS.

          A Participant  may, in accordance with rules adopted by the Committee,
submit an  Authorization  Form that authorizes a payroll  deduction of any whole
percentage  from one (1) percent to fifteen (15)  percent of such  Participant's
Compensation  (not to exceed the $25,000  limit set forth in 4(c) above) on each
pay period during the Offering  Period.  A Participant  may increase or decrease
such payroll deduction  (including a cessation of payroll deductions)  effective
as of the start of the next Offering  Period,  provided the Employee  files with
the Company the  Authorization  Form requesting such change by the date required
by the Company.

          All payroll deductions made by a Participant shall be credited to such
Participant's  account under the Plan. A Participant may not make any additional
payments into such account.


14. EXERCISE OF OPTION.

          Unless a Participant  withdraws from the Plan as provided in Section 8
hereof,  such  Participant's  election  to  purchase  shares  will be  exercised
automatically  on the  Exercise  Date,  and the  maximum  number of full  shares
subject to such option will be purchased for such  Participant at the applicable
option  price  with  the  accumulated  payroll  deductions  and  cash  dividends
(credited pursuant to Section 9 hereof) in such Participant's account.  During a
Participant's  lifetime,  his or her  option to  purchase  shares  hereunder  is
exercisable only by such Participant.

          Any cash  balance  remaining  in a  Participant's  account  after  the
termination of an Offering Period will be carried  forward to the  Participant's
account for the purchase of Common Stock during the next Offering  Period if the
Participant has elected to continue to participate in the Plan.  Otherwise,  the
Participant  will  receive a cash  payment  equal to the  balance  of his or her
account  as soon as  administratively  feasible.  The  shares  of  Common  Stock
purchased  upon  exercise  of an  option  hereunder  shall  be  credited  to the
Participant's  account under the Plan and shall be deemed to be  transferred  to
the Participant on the Exercise Date and, except as otherwise  provided  herein,
the  Participant  shall have all rights of a  stockholder  with  respect to such
shares.

15. DELIVERY OF COMMON STOCK.

          As promptly as practicable after receipt by the Committee of a written
request for withdrawal of Common Stock from any  Participant,  the Company shall
arrange the delivery to such Participant of a stock certificate representing the
shares of Common Stock which the Participant  requests to withdraw.  Withdrawals
may be made no more  frequently than twice each Plan Year unless approved by the
Committee in its sole  discretion.  Shares of Common Stock  received  upon stock
dividends  or stock  splits  shall be treated as having  been  purchased  on the
Exercise Date of the shares to which they relate.

16. WITHDRAWAL; TERMINATION OF EMPLOYMENT.

          A  Participant  may  withdraw  all, but not less than all, the payroll
deductions and cash dividends credited to such Participant's  account (that have
not been used to purchase  shares of Common Stock) under the Plan at any time by
giving  written  notice to the Company  received prior to the Exercise Date. All
such  payroll  deductions  and cash  dividends  credited  to such  Participant's
account  will be  paid  to  such  Participant  promptly  after  receipt  of such
Participant's  notice  of  withdrawal  and  such  Participant's  option  for the
Offering Period in which the withdrawal occurs will be automatically terminated.
No further payroll deductions for the purchase of shares of Common Stock will be
made for such Participant  during such Offering Period,  and any additional cash
dividends during the Offering Period will be distributed to the Participant.

          Upon  termination of a  Participant's  status as an Employee during an
Offering Period for any reason,  including voluntary or involuntary termination,
retirement or death, the payroll  deductions and cash dividends credited to such
Participant's account that have not been used to purchase shares of Common Stock
will be returned (and any future cash  dividends  will be  distributed)  to such
Participant  or,  in the case of such  Participant's  death,  to the  person  or
persons entitled thereto under Section 12 hereof, and such Participant's  option
will be automatically  terminated.  A Participant's  status as an Employee shall
not be  considered  terminated  in THE CASE OF A LEAVE OF  ABSENCE  AGREED TO IN
WRITING BY THE COMPANY (INCLUDING, BUT NOT LIMITED TO, MILITARY AND SICK LEAVE),
PROVIDED  that such leave is for a period of not more than  ninety  (90) days or
reemployment upon expiration of such leave is guaranteed by contract or statute.

          A Participant's withdrawal from an offering will make that Participant
ineligible to participate in the next succeeding Offering Period.

17. DIVIDENDS.

          Cash  dividends paid on Common Stock held in a  Participant's  account
shall be credited to such Participant's  account and used in addition to payroll
deductions to purchase  shares of Common Stock on the Exercise  Date.  Dividends
paid in Common  Stock or stock  splits of the Common  Stock shall be credited to
the  accounts of  Participants.  Dividends  paid in property  other than cash or
Common Stock shall be distributed to Participants as soon as practicable.

          No interest  shall accrue on or be payable with respect to the payroll
deductions or credited cash dividends of a Participant in the Plan.

18. STOCK.

          The maximum  number of shares of Common  Stock which shall be reserved
for sale  under  the Plan  shall be  300,000,  subject  to  adjustment  upon the
occurrence of an event as provided in Section 15 hereof.  If the total number of
shares which would otherwise be subject to options  granted  pursuant to Section
4.a.  hereof on an Offering  Date  exceeds  the number of shares then  available
under the Plan  (after  deduction  of all  shares  for which  options  have been
exercised  or are  then  outstanding),  the  Committee  shall  make  a pro  rata
allocation  of the shares  remaining  available for option grant in as uniform a
manner as shall be  practicable  and as it shall  determine to be equitable.  In
such event,  the Committee shall give written notice to each Participant of such
reduction of the number of option shares  affected  thereby and shall  similarly
reduce the rate of payroll deductions, if necessary.

          Shares of Common Stock to be delivered to a Participant under the Plan
will be  registered  in the name of the  Participant  or, at the election of the
Participant,  in the name of the Participant and another person as joint tenants
with rights of survivorship.

19. ADMINISTRATION.

          The Plan shall be administered by the Committee, and the Committee may
select an administrator to whom its duties and responsibilities hereunder may be
delegated.  The Committee  shall have full power and  authority,  subject to the
provisions  of the Plan, to promulgate  such rules and  regulations  as it deems
necessary for the proper administration of the Plan, to interpret the provisions
and  supervise  the  administration  of the  Plan,  and to take  all  action  in
connection  therewith or in relation thereto as it deems necessary or advisable.
Any  decision  reduced to writing and signed by a majority of the members of the
Committee  shall be fully  effective  as if it had been made at a  meeting  duly
held. The Company will pay all expenses  incurred in the  administration  of the
Plan.  No member of the  Committee  shall be  personally  liable for any action,
determination,  or  interpretation  made in good faith with respect to the Plan,
and all members of the Committee shall be fully  indemnified by the Company with
respect to any such action, determination or interpretation.

20. DESIGNATION OF BENEFICIARY.

          A  Participant  may file,  on forms  supplied by and  delivered to the
Company, a written designation of a beneficiary who is to receive any shares and
cash in the event of the  Participant's  death.  Such designation of beneficiary
may be changed by the Participant at any time by written notice. In the event of
the  death  of a  Participant  and  in  the  absence  of a  beneficiary  validly
designated under the Plan who is living at the time of such Participant's death,
the  Company   shall  deliver  such  shares  and/or  cash  to  the  executor  or
administrator  of the  estate  of the  Participant  or, if no such  executor  or
administrator has been appointed (to the knowledge of the Company), the Company,
in its discretion,  may delivery such shares and/or cash to the spouse or to any
one or  more  dependents  or  relatives  of the  Participant,  or if no  spouse,
dependent or relative is known to the Company,  then to such other person as the
Company may designate.

21. TRANSFERABILITY.

          Neither payroll deductions credited to a Participant's account nor any
rights with regard to the  exercise of an option or to receive  shares under the
Plan may be assigned,  transferred,  pledged or otherwise disposed of in any way
(other  than by will,  the laws of descent  and  distribution  or as provided in
Section 12 hereof) by the Participant. Any such attempt at assignment, transfer,
pledge or other disposition shall be without effect, except that the Company may
treat such act as an election to withdraw  funds in  accordance  with  Section 8
hereof.

22. USE  OF FUNDS.

          All payroll deductions  received or held by the Company under the Plan
may be used by the Company for any corporate purpose,  and the Company shall not
be obligated to segregate such payroll deductions.

23. EFFECT OF CERTAIN CHANGES.
          In the event of any  increase,  reduction,  or change or  exchange  of
shares  of  Common  Stock  for a  different  number  or kind of  shares or other
securities  of the  Company by reason of a  reclassification,  recapitalization,
merger,  consolidation,  reorganization,  stock dividend, stock split or reverse
stock split, combination or exchange of shares,  repurchase of shares, change in
corporate structure, distribution of an extraordinary dividend or otherwise, the
Committee shall conclusively determine the appropriate equitable adjustments, if
any, to be made under the Plan, including without limitation  adjustments to the
number of shares of Common Stock which have been  authorized  for issuance under
the Plan but have not yet been  placed  under  option,  as well as the price per
share of Common  Stock  covered by each option  under the Plan which has not yet
been exercised.

24. AMENDMENT OR TERMINATION.

          The Board  may at any time  terminate  or amend  the  Plan.  Except as
provided in Section 15 hereof,  no such termination can adversely affect options
previously  granted  and  no  amendment  may  make  any  change  in  any  option
theretofore  granted which adversely  affects the rights of any Participant.  No
amendment shall be effective  unless approved by the stockholders of the Company
if  stockholder  approval of such  amendment is required to comply with any law,
regulation or stock exchange rule.

25. NOTICES.

          All notices or other  communications  by a Participant  to the Company
under or in  connection  with the Plan  shall be deemed to have been duly  given
when received in the form  specified by the Company at the  location,  or by the
person, designated by the Company for the receipt thereof.

26. REGULATIONS AND OTHER APPROVALS; GOVERNING LAW

          This Plan and the rights of all persons  claiming  hereunder  shall be
construed and  determined  in accordance  with the laws of the State of Delaware
applicable to contracts  made and to be performed in such State.  The obligation
of the Company to sell or deliver shares of Common Stock with respect to options
granted  under the Plan  shall be  subject  to all  applicable  laws,  rules and
regulations, including all applicable Federal and state securities laws, and the
obtaining  of all such  approvals  by  governmental  agencies  as may be  deemed
necessary or appropriate  by the Committee.  The Plan is intended to comply with
Rule 16b-3 as promulgated under Section 16 of the Exchange Act and the Committee
shall interpret and administer the provisions of the Plan in a manner consistent
therewith.  Any provisions  inconsistent with such Rule shall be inoperative and
shall not affect the validity of the Plan.


27. WITHHOLDING  OF  TAXES.

          If the Participant makes a disposition,  within the meaning of Section
424(c)  of the Code and  regulations  promulgated  thereunder,  of any  share or
shares issued to such Participant pursuant to such Participant's  exercise of an
option, and such disposition occurs within the two-year period commencing on the
day after the Offering Date or within the one-year period  commencing on the day
after the Exercise Date, such  Participant  shall,  within five (5) days of such
disposition,  notify the Company thereof and thereafter  immediately  deliver to
the Company any amount of Federal, state or local income taxes and other amounts
which the Company informs the Participant the Company is required to withhold.

28. EFFECTIVE DATE;  APPROVAL OF  STOCKHOLDERS.

          The Plan is effective as of July 1, 1999.  The Plan shall be submitted
to the  stockholders  of the Company for their approval at the next  stockholder
meeting.  The Plan is conditioned  upon the approval of the  stockholders of the
Company, and failure to receive their approval shall render the Plan void and of
no effect.





                                  ATTACHMENT A

                                 TELIGENT, INC.
                        1999 EMPLOYEE STOCK PURCHASE PLAN
                               AUTHORIZATION FORM

         I,  _________________  , acknowledge receipt of a copy of the Teligent,
Inc. 1999  Employee  Stock  Purchase  Plan (the "Plan"),  and agree to the terms
thereunder.

         I elect:

                  (A)      ____ TO COMMENCE OR TO CONTINUE  PARTICIPATION IN THE
                           PLAN,  AND  EFFECTIVE AS OF THE OFFERING  DATE1 which
                           next commences after the date hereof, I elect to have
                           __%  (write  in  any  whole  number  from  1  to  15,
                           inclusive) of my weekly Compensation  deducted by the
                           Company  for the  purchase  of  Common  Stock on each
                           subsequent  Exercise  Date  until  I  have  submitted
                           another form revoking this authorization or modifying
                           it.

                  (b)      ____ to  cease  participation  in the Plan as of the
                           date hereof.

         I further elect:

                  (a)      ____ to have all shares of Common Stock to be
                           delivered to me hereunder to be registered in my
                           name.

                  (b)      ____ to have all shares of Common Stock to be
                           delivered to me hereunder to be registered in my name
                           and that of _____________ as joint tenants with right
                           of survivorship.




                                                       Name:____________________
                                                       Date:____________________


- --------
1 All capitalized terms not otherwise defined in this  Authorization  Form shall
have the meaning ascribed to them in the Plan.