AETHER SYSTEMS LLC
S-8, 1999-11-19
COMPUTER INTEGRATED SYSTEMS DESIGN
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  As filed with the Securities and Exchange Commission on November 19, 1999

                                            Registration No. 333_______________

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


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    Form S-8
                             REGISTRATION STATEMENT
                                      under
                           THE SECURITIES ACT OF 1933

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

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

            Delaware                                          52-2186634
(State or other jurisdiction of                            (I.R.S. employer
 incorporation or organization)                         identification number)

                              11460 Cronridge Drive
                          Owings Mills, Maryland 21117
                    (Address of Principal Executive Offices)

                                 (410) 654-6400
              (Registrant's telephone number, including area code)

                              Aether Systems, Inc.
                           1999 Equity Incentive Plan
                            (Full title of the plan)

                                  David S. Oros
                             Chairman of the Board,
                       Chief Executive Officer & President

                              Aether Systems, Inc.
                              11460 Cronridge Drive
                          Owings Mills, Maryland 21117
                                 (410) 654-6400
          (Name and address, including zip code, and telephone number,
                   including area code, of agent for service)

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

                                 With a copy to:

                             R. Scott Kilgore, Esq.
                           Wilmer, Cutler & Pickering
                               2445 M Street, N.W.
                             Washington, D.C. 20037

                           ---------------------------
<PAGE>
 <TABLE>
<CAPTION>


                                               CALCULATION OF REGISTRATION FEE



<S>                       <C>                         <C>                <C>              <C>               <C>
                                                                          Proposed           Proposed
                               Title of                                    Maximum            Maximum
                              Securities                  Amount          Offering           Aggregate          Amount of
                                to be                     to be            Price             Offering        Registration
         Name of Plan         Registered                Registered       Per Share (1)        Price (1)           Fee (1)
- ------------------------------------------------------------------------------------------------------------------------------------
1999 Equity Incentive     Common Stock, par $0.01       5,400,000          $31.98          $172,690,096         $48,008
Plan (the "1999 Plan")
- ------------------------------------------------------------------------------------------------------------------------------------


<FN>


(1) In accordance with Rule 457(h) and Rule 457(c) the aggregate offering price and the amount of the registration fee are
    computed on the basis of (a) for 2,481,091 shares not yet subject to options, $66.69, the average of the high and low
    prices reported in the Nasdaq Stock Market on November 12, 1999, and (b) for granted options for 2,918,959 shares, the
    actual exercise prices specified in those granted options (which range from $0.40 to $8.00.) Also registered hereunder
    are such additional number of shares of Common Stock, presently indeterminable, as may be necessary to satisfy the
    antidilution provisions of the Plan to which this Registration Statement relates.


</FN>
</TABLE>

                                      - 2 -

<PAGE>

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

                  Note: The document(s)  containing the information  required by
Item 1 of Form S-8 and the statement of availability  of registrant  information
and any other  information  required by Item 2 of Form S-8 will be sent or given
to  participants  as specified by Rule 428 under the  Securities Act of 1933, as
amended (the "Securities Act"). In accordance with Rule 428 and the requirements
of Part I of Form S-8, such documents are not being filed with the SEC either as
part of this Registration Statement or as prospectuses or prospectus supplements
pursuant  to Rule 424  under the  Securities  Act.  Aether  Systems,  Inc.  (the
"Registrant"  or the  "Company")  shall  maintain  a file of such  documents  in
accordance with the provisions of Rule 428. Upon request,  the Registrant  shall
furnish the SEC or its staff a copy or copies of all of the  documents  included
in such file.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference

                  The Company  hereby  incorporates  by reference  the documents
listed in (a) through (c) below. In addition,  all documents  subsequently filed
by the Company pursuant to Section 13(a),  13(c), 14 and 15(d) of the Securities
Exchange  Act of 1934,  as amended  (the  "Exchange  Act") (prior to filing of a
Post-Effective  Amendment which indicates that all securities  offered have been
sold or which  deregisters all securities then remaining unsold) shall be deemed
to be incorporated by reference in this Registration  Statement and to be a part
hereof from the date of filing of such documents.

         (a) Prospectus on Form 424B4 filed by the Company on October 21, 1999.

         (b) The Company's Registration Statement on Form S-1 (SEC No.333-85697
             filed by the Company on August 20, 1999 and all amendments
             thereafter.

         (c) The   description   of  the  Company's   Common  Stock  which  is
             incorporated by reference from the Prospectus on Form 424B4 filed
             by the Company on October 21, 1999,  including  any  amendment or
             report filed for the purpose of updating such description.


Item 4. Description of Securities

           Not Applicable


Item 5.   Interests of Named Experts and Counsel

                  The validity of the shares of Company Common Stock that may be
issued under  options  granted  under the 1999 Plan is being passed upon for the
Company by Wilmer,  Cutler & Pickering.  George P. Stamas, a member of the Board
of Directors, is a partner in Wilmer, Cutler & Pickering. As of the date of this
Registration Statement,  Mr. Stamas had received stock options to purchase
23,850 shares of Common Stock and he holds a non-voting interest in  Telcom-ATI
Investors.

                                      - 3 -

<PAGE>


Item 6.   Indemnification of Directors and Officers

                  Under Section 145 of the General Corporate law of the State of
Delaware,  Aether  Systems  has broad  powers to  indemnify  its  directors  and
officers  against  liabilities  they  may  incur in such  capacities,  including
liabilities under the Securities Act of 1933, as amended (the "Securities Act").
Aether  Systems'  bylaws  also  provide  for  mandatory  indemnification  of its
directors  and  executive  officers,  and  permissive   indemnification  of  its
employees and agents, to the fullest extent permissible under Delaware law.

                  Aether's  certificate  of  incorporation   provides  that  the
liability of its  directors  for monetary  damages  shall be  eliminated  to the
fullest extent  permissible  under Delaware law.  Pursuant to Delaware law, this
includes  elimination  of  liability  for  monetary  damages  for  breach of the
directors'  fiduciary  duty of  care  to  Aether  and  its  stockholders.  These
provisions  do not  eliminate the  directors'  duty of care and, in  appropriate
circumstances,   equitable  remedies  such  as  injunctive  or  other  forms  of
non-monetary relief will remain available under Delaware law. In addition,  each
director will  continue to be subject to liability for breach of the  director's
duty of loyalty to Aether,  for acts or omissions not in good faith or involving
intentional misconduct,  for knowing violations of law, for any transaction from
which the  director  derived an improper  personal  benefit,  and for payment of
dividends  or approval of stock  repurchases  or  redemptions  that are unlawful
under   Delaware  law.  The   provision   also  does  not  affect  a  director's
responsibilities  under any other laws,  such as the federal  securities laws or
state or federal environmental laws.

                  Prior to the  effective  date of the  Registration  Statement,
Aether will have entered into  agreements  with its directors and certain of its
executive  officers that require Aether to indemnify  such persons  against II-1
expenses,   judgments,   fines,  settlements  and  other  amounts  actually  and
reasonably  incurred  (including  expenses of a derivative action) in connection
with any  proceeding,  whether  actual or  threatened,  to which any such person
maybe  made a party by reason of the fact that such  person is or was a director
or officer of Aether or any of its affiliated enterprises,  provided such person
acted in good father and in a manner such person reasonably believed to be in or
not opposed to the best  interests  of Aether and,  with respect to any criminal
proceeding,  had no reasonable cause to believe his or her conduct was unlawful.
The indemnification agreements also set forth certain procedures that will apply
in the event of a claim for indemnification thereunder.

                  Aether intends to obtain in conjunction with the effectiveness
of the  Registration  Statement a policy of directors'  and officers'  liability
insurance  that insures  Aether's  directors  and  officers  against the cost of
defense, settlement or payment of a judgment under certain circumstances.

                  The  Underwriting  Agreement  filed  as  Exhibit  1.1  to  the
Registration  Statement  provides for  indemnification  by the  underwriters  of
Aether and its officers and directors for certain  liabilities arising under the
Securities Actor otherwise.


Item 7.   Exemption from Registration Claimed

          Not Applicable.

                                      - 4 -
<PAGE>



Item 8.   Exhibits

The Exhibit Index attached to this Registration Statement is incorporated herein
by reference.

Item 9.   Undertakings

(a)       The undersigned Registrant hereby undertakes:

            (1)    To file, during any period in which offers or sales are being
                   made, a post-effective  amendment to this Registration
                   Statement:

                           (i)     To include any prospectus required by Section
                                   10(a)(3) of the Securities Act;

                           (ii)    To reflect in the prospectus any facts or
                                   events arising after the effective date of
                                   this Registration Statement (or the most
                                   recent post-effective amendment thereof)
                                   which, individually or in the aggregate,
                                   represent a fundamental change in the
                                   information set forth in this Registration
                                   Statement;

                           (iii)   To include any material information with
                                   respect to the plan of distribution not
                                   previously disclosed in this Registration
                                   Statement or any material change to such
                                   information in this Registration Statement;

                    provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii)
                    do not apply if the information required to be included in a
                    post-effective amendment by those paragraphs is contained in
                    periodic reports filed by the registrant pursuant to section
                    13  or  section   15(d)  of  the   Exchange   Act  that  are
                    incorporated by reference in the registration statement.

            (2)     That, for the purpose of determining any liability under the
                    Securities Act, each such post-effective  amendment shall be
                    deemed to be a new  registration  statement  relating to the
                    securities  offered  therein,   and  the  offering  of  such
                    securities  at that time  shall be deemed to be the  initial
                    bona fide offering thereof.

            (3)     To remove  from  registration  by means of a  post-effective
                    amendment  any  of the  securities  being  registered  which
                    remain unsold at the termination of the offering.

(b)       The undersigned  Registrant  hereby  undertakes  that, for purposes of
          determining any liability under the Securities Act, each filing of the
          Registrant's  annual report pursuant to section 13(a) or section 15(d)
          of the  Exchange  Act  (and,  where  applicable,  each  filing  of any
          employee benefit plan's annual report pursuant to section 15(d) of the
          Exchange Act) that is incorporated  by reference in this  Registration
          Statement shall be deemed to be a new registration statement reflating
          to the securities offered therein, and the offering of such securities
          at that  time  shall be deemed to be the  initial  bona fide  offering
          thereof.

                                      - 5 -

<PAGE>

(c)       Insofar  as   indemnification   for  liabilities   arising  under  the
          Securities Act may be permitted to directors, officers and controlling
          persons of the  Registrant  pursuant to the foregoing  provisions,  or
          otherwise,  the Registrant has been advised that in the opinion of the
          SEC such  indemnification is against public policy as expressed in the
          Securities Act and is, therefore,  unenforceable.  In the event that a
          claim for  indemnification  against such  liabilities  (other than the
          payment by the Registrant of expenses  incurred or paid by a director,
          officer or  controlling  person of the  Registrant  in the  successful
          defense  of any  action,  suit  or  proceeding)  is  asserted  by such
          director,  officer  or  controlling  person  in  connection  with  the
          securities  being  registered,  the  Registrant  will,  unless  in the
          opinion of its  counsel  the matter  has been  settled by  controlling
          precedent,  submit to a court of appropriate jurisdiction the question
          of whether  such  indemnification  by it is against  public  policy as
          expressed  in the  Securities  Act and will be  governed  by the final
          adjudication of such issue.

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













                                      - 6 -

<PAGE>

                                   SIGNATURES

                  Pursuant to the  requirements  of the  Securities Act of 1933,
the Company  certifies that it has  reasonable  grounds to believe that it meets
all of the  requirements  for  filing  on  Form  S-8 and has  duly  caused  this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in Owings Mill, Maryland on the 18th day of November, 1999.

                                                AETHER SYSTEMS, INC.

                                                By:  /s/ David S. Oros
                                                -------------------------------
                                                David S. Oros
                                                Chief Executive Office


                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS,  that each person whose signature  appears below
under the heading  "Signature"  constitutes and appoints David S. Oros and David
C.  Reymann as his or her true and lawful  attorney-in-fact  each acting  alone,
with full power of substitution and resubstitution, for him or her and in his or
her  name,  place  and  stead,  in any and  all  capacities  to sign  any or all
amendments (including post-effective amendments) to this Registration Statement,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith, with the Securities and Exchange Commission, granting unto
said  attorney-in-fact full power and authority to do and perform each and every
act and thing  requisite and necessary to be done in and about the premises,  as
fully for all  intents  and  purposes  as he or she might or could do in person,
hereby  ratifying and confirming all that said  attorney-in-fact,  or his or her
substitute, acting alone, may lawfully do or cause to be done by virtue hereof.

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

    Signature                            Title                      Date


                                Chairman of the Board,
/s/ David S. Oros               Chief Executive Officer
- ------------------------        and President                 November 18, 1999
David S. Oros


/s/ David C. Reymann
- ------------------------        Chief Financial Officer       November 18, 1999
David C. Reymann


/s/ J. Carter Beese, Jr.
- ------------------------        Director                      November 18, 1999
J. Carter Beese, Jr.


/s/ Frank A. Bonsal, Jr.
- ------------------------        Director                      November 18, 1999
Frank A. Bonsal, Jr.



                                      - 7 -
<PAGE>

   Signature                        Title                           Date


/s/ Mark D. Ein
- ------------------------           Director                   November 18, 1999
Mark D. Ein


/s/ Rahul C. Prakash
- ------------------------           Director                   November 18, 1999
Rahul C. Prakash


/s/ Janice M. Roberts
- ------------------------           Director                   November 18, 1999
Janice M. Roberts


/s/ Rajendra Singh
- ------------------------           Director                   November 18, 1999
Dr. Rajendra Singh


/s/ George P. Stamas
- ------------------------           Director                   November 18, 1999
George P. Stamas


/s/ Devin N. Wenig
- ------------------------           Director                   November 18, 1999
Devin N. Wenig


/s/ Thomas E. Wheeler
- ------------------------           Director                   November 18, 1999
Thomas E. Wheeler


                                      - 8 -
<PAGE>


                                  EXHIBIT INDEX


Exhibit
Number    Description
_____________________

4.1       1999 Equity Incentive Plan

5         Opinion of Wilmer, Cutler & Pickering as to the legality of the
          securities being registered

23.1      Consent of KPMG LLP

23.2      Consent of PricewaterhouseCoopers LLP

24        Power of attorney (included on signature pages of this Registration
          Statement)

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



                                      - 9 -





                              AETHER SYSTEMS, INC.
                           1999 EQUITY INCENTIVE PLAN


PURPOSE             Aether   Systems,   Inc.,   a  Delaware   corporation  (the
                    "Company"), wishes to recruit, reward, and retain employees,
                    outside directors,  and other service providers.  To further
                    these  objectives,  the Company hereby sets forth the Aether
                    Systems,  Inc.  1999  Equity  Incentive  Plan (the  "Plan"),
                    effective as of October 1, 1999 (the "Effective  Date"),  to
                    provide options ("Options") to employees, outside directors,
                    and  other   service   providers  of  the  Company  and  its
                    subsidiaries  to  purchase  shares of the  Company's  common
                    stock (the "Common Stock").

PARTICIPANTS        All  Employees of the Company and any Eligible  Subsidiaries
                    are eligible for Options under this Plan. Eligible employees
                    become  "optionees"  when the  Administrator  grants them an
                    option  under this Plan.  The  Administrator  may also grant
                    options to consultants and certain other service  providers.
                    The term optionee also includes, where appropriate, a person
                    authorized  to exercise  an Option in place of the  original
                    recipient.

                    Employee means any person  employed as a common law employee
                    of the Company or an Eligible Subsidiary.

ADMINISTRATOR       The Administrator will be the Compensation  Committee of the
                    Board of  Directors,  unless  the  Board  specifies  another
                    committee  of the  Board,  but the Board may still act under
                    the Plan as though it were the Compensation Committee.

                    The  Administrator is responsible for the general  operation
                    and  administration  of the  Plan and for  carrying  out its
                    provisions  and has  full  discretion  in  interpreting  and
                    administering  the  provisions  of the Plan.  Subject to the
                    express  provisions  of  the  Plan,  the  Administrator  may
                    exercise  such  powers  and  authority  of the  Board as the
                    Administrator may find necessary or appropriate to carry out
                    its functions.  The Administrator may delegate its functions
                    (other  than  those  described  in the  Granting  of Options
                    section) to officers or other employees of the Company.


                    The Administrator's  powers will include, but not be limited
                    to, the power to amend,  waive,  or extend any  provision or
                    limitation of any Option.  The Administrator may act through
                    meetings  of a  majority  of  its  members  or by  unanimous
                    consent.

________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                   Page 1 of 17

<PAGE>

GRANTING OF         Subject to the terms of the Plan, the Administrator will, in
OPTIONS             its sole discretion, determine

                              the persons who receive Options,

                              the terms of such Options,

                              the schedule for exercisability  (including any
                              requirements that the optionee or the Company
                              satisfy performance criteria),

                              the time and conditions for expiration of the
                              Option, and

                              the form of payment due upon exercise.

                    The Administrator's determinations under the Plan need not
                    be uniform and need not consider whether possible recipients
                    are similarly situated.

                    Options granted to employees may be "incentive stock
                    options" ("ISOs") within the meaning of Section 422 of the
                    Internal Revenue Code of 1986 (the "Code"), or the
                    corresponding provision of any subsequently enacted tax
                    statute, or nonqualified stock options ("NQSOs"), and the
                    Administrator will specify which form of option it is
                    granting. (If the Administrator fails to specify the form,
                    it will be an ISO.) Any options granted to outside directors
                    must be nonqualified stock options.

          Substitutions       The Administrator will grant Options in
                              replacement for any outstanding options with
                              respect to Aether Technologies International,
                              L.L.C. held by persons eligible to receive Options
                              under this Plan. The Administrator may also grant
                              Options in substitution for options or other
                              equity interests held by individuals who become
                              Employees of the Company or of an Eligible
                              Subsidiary as a result of the Company's or
                              Subsidiary's acquiring or merging with the
                              individual's employer or acquiring its assets. In
                              addition, the Administrator may provide for the
                              Plan's assumption of options granted outside the
                              Plan to persons who would have been eligible under
                              the terms of the Plan to receive a grant,
                              including both persons who provided services to
                              any acquired company or business and persons who
                              provided services to the Company or any
                              Subsidiary. If necessary to conform the Options to
                              the interests for which they are substitutes, the
                              Administrator may grant substitute Options under
                              terms and conditions that vary from those the Plan
                              otherwise requires.

________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                   Page 2 of 17
<PAGE>

DATE OF GRANT       The  Date  of  Grant  will  be  the  date  as of  which  the
                    Administrator   grants  an  Option  to  a  participant,   as
                    specified in the Administrator's minutes.

EXERCISE PRICE      The Exercise Price is the value of the consideration that an
                    optionee  must  provide in exchange  for one share of Common
                    Stock. The  Administrator  will determine the Exercise Price
                    under each  Option and may set the  Exercise  Price  without
                    regard to the Exercise Price of any other Options granted at
                    the  same  or any  other  time.  The  Company  may  use  the
                    consideration  it  receives  from the  optionee  for general
                    corporate purposes.

                    The Exercise Price per share for NQSOs may not be less than
                    100% of the Fair Market Value of a share on the Date of
                    Grant for grants made after the IPO Effective Date. For
                    ISOs, the Exercise Price per share must be at least 100% of
                    the Fair Market Value (on the Date of Grant) of a share of
                    Common Stock covered by the Option; provided, however, that
                    if the Administrator decides to grant an ISO to someone
                    covered by Code Sections 422(b)(6) and 424(d) (as a
                    more-than-10%-stock-owner), the Exercise Price must be at
                    least 110% of the Fair Market Value.

          FAIR MARKET     Fair Market Value of a share of Common Stock for
          VALUE           purposes of the Plan will be determined as follows:

                              if the Company has no publicly-traded stock, the
                              Administrator will determine the Fair Market Value
                              for purposes of the Plan using any measure of
                              value it determines in good faith to be
                              appropriate; if the Common Stock trades on a
                              national securities exchange, the closing sale
                              price on that date;

                              if the Common Stock does not trade on any such
                              exchange, the closing sale price as reported by
                              the National Association of Securities Dealers,
                              Inc. Automated Quotation System ("Nasdaq") for
                              such date;

                              if no such closing sale price information is
                              available, the average of the closing bid and
                              asked prices that Nasdaq reports for such date; or

                              if there are no such closing bid and asked prices,
                              the average of the closing bid and asked prices as
                              reported by any other commercial service for such
                              date.
________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                   Page 3 of 17
<PAGE>

                              For any date that is not a trading day, the Fair
                              Market Value of a share of Common Stock for such
                              date will be determined by using the closing sale
                              price or the average of the closing bid and asked
                              prices, as appropriate, for the immediately
                              preceding trading day. The Administrator can
                              substitute a particular time of day or other
                              measure of "closing sale price" if appropriate
                              because of changes in exchange or market
                              procedures.

                              The Fair Market Value will be treated as equal to
                              the price established in an IPO for any Options
                              granted as of the IPO if they are granted on or
                              before the date on which the IPO's underwriters
                              price the IPO or granted on the following day
                              before trading opens in the Common Stock.

                              The Administrator has sole discretion to determine
                              the Fair Market Value for purposes of this Plan,
                              and all Options are conditioned on the optionees'
                              agreement that the Administrator's determination
                              is conclusive and binding even though others might
                              make a different and also reasonable
                              determination.

EXERCISABILITY      The Administrator will determine the times and conditions
                    for exercise of each Option.

                    Options  will become  exercisable  at such times and in such
                    manner  as  the  Administrator  determines  and  the  Option
                    Agreement   indicates;    provided,    however,   that   the
                    Administrator  may,  on  such  terms  and  conditions  as it
                    determines  appropriate,  accelerate  the time at which  the
                    optionee may exercise any portion of an Option.

                    If the  Administrator  does not specify  otherwise,  Options
                    will  become   exercisable  as  to  25%  per  year  on  each
                    anniversary of the Date of Grant.

                    No  portion  of  an  Option  that  is  unexercisable  at  an
                    optionee's  termination of employment will thereafter become
                    exercisable, unless the Option Agreement provides otherwise,
                    either initially or by amendment.

     CHANGE OF      Upon a Change of Control  (as  defined  below),  all Options
     CONTROL        will become fully exercisable,  unless the optionee's Option
                    Agreement provides  otherwise.  A Change of Control for this
                    purpose  means  the  occurrence  of any  one or  more of the
                    following events after the Company's IPO:

________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                   Page 4 of 17
<PAGE>
                              (i) sale of all or substantially all of the assets
                              of the Company to one or more individuals,
                              entities, or groups (other than an "Excluded
                              Owner" as defined below);

                              (ii) complete or substantially complete
                              dissolution or liquidation of the Company;

                              (iii) a person, entity, or group (other than an
                              Excluded Owner) acquires or attains ownership of
                              at least 80% of the undiluted total voting power
                              of the Company's then-outstanding securities
                              eligible to vote to elect members of the Board
                              ("Company Voting Securities");

                              (iv) completion of a merger or consolidation of
                              the Company with or into any other entity (other
                              than an Excluded Owner) unless the holders of the
                              Company Voting Securities outstanding immediately
                              before such completion, together with any trustee
                              or other fiduciary holding securities under a
                              Company benefit plan, retain control because they
                              hold securities that represent immediately after
                              such merger or consolidation more than 20% of the
                              combined voting power of the then outstanding
                              voting securities of either the Company or the
                              other surviving entity or its ultimate parent

                              (v) the individuals who constitute the Board
                              immediately before a proxy contest cease to
                              constitute at least a majority of the Board
                              (excluding any Board seat that is vacant or
                              otherwise unoccupied) immediately following the
                              proxy contest; or

                              (vi) during any two year period, the individuals
                              who constitute the Board at the beginning of the
                              period (the "Incumbent Directors") cease for any
                              reason to constitute at least a majority of the
                              Board (excluding any Board seat that is vacant or
                              otherwise unoccupied), provided that any
                              individuals that a majority of Incumbent Directors
                              approve for service on the Board are treated as
                              Incumbent Directors.

________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 5 of 17
<PAGE>

                    An "Excluded Owner" consists of the Company, any Company
                    Subsidiary, any Company benefit plan, or any underwriter
                    temporarily holding securities for an offering of such
                    securities.

                    Even if other tests are met, a Change of Control has not
                    occurred under any circumstance in which the Company files
                    for bankruptcy protection or is reorganized following a
                    bankruptcy filing. The Administrator may determine that a
                    particular optionee's Options will not become fully
                    exercisable as a result of what the Administrator, in its
                    sole discretion, determines is the optionee's insufficient
                    cooperation with the Company with respect to a Change of
                    Control. In addition, the acceleration will not occur if it
                    would prevent use of "pooling of interest" accounting for a
                    reorganization, merger, or consolidation of the Company that
                    the Board approves.

                    The Administrator may allow conditional exercises in advance
                    of the completion of a Change of Control that are then
                    rescinded if no Change of Control occurs.

    SUBSTANTIAL     Upon a Change of Control that is also a Substantial
    CORPORATE       Corporate Change, the Options will become exercisable
    CHANGE          (unless the Change of Control section provides otherwise)
                    and the Plan and any unexercised Options will terminate
                    (after the occurrence of one of the alternatives set forth
                    in the next full paragraph) unless either (i) such
                    termination would prevent use of "pooling of interest"
                    accounting for a reorganization, merger, or consolidation of
                    the Company that the Board approves or (ii) provision is
                    made in writing in connection with such transaction for


                              the assumption or continuation of outstanding
                              Options, or

                              the substitution for such options or grants of any
                              options or grants covering the stock or securities
                              of a successor employer entity, or a parent or
                              subsidiary of such successor, with appropriate
                              adjustments as to the number and kind of shares of
                              stock and prices, in which event the Options will
                              continue in the manner and under the terms so
                              provided.
________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 6 of 17
<PAGE>

                    If an Option would otherwise terminate under the preceding
                    sentence and the Fair Market Value of the Common Stock as a
                    result of the Substantial Corporate Change exceeds or is
                    likely to exceed the Exercise Price, the Administrator will
                    either provide that

                              optionees will have the right, at such time before
                              the completion of the transaction causing such
                              termination as the Board or the Administrator
                              reasonably designates, to exercise any unexercised
                              portions of the Option, including those portions
                              that the Change of Control will make exercisable
                              or

                              cause the Company, or agree to allow the
                              successor, to cancel each Option after payment to
                              the optionee of an amount in cash, cash
                              equivalents, or successor equity interests
                              substantially equal to the Fair Market Value under
                              the transaction minus the Exercise Price for the
                              shares covered by the Option (and, where the Board
                              or Administrator determines it is appropriate, any
                              required tax withholdings).

                    The Administrator may allow conditional exercises in advance
                    of the completion of a Substantial Corporate Change that are
                    then rescinded if no Substantial Corporate Change occurs.

                    The Board or other Administrator may take any actions
                    described in the Substantial Corporate Changes section,
                    without any requirement to seek optionee consent.

                    A Substantial Corporate Change means any of the following
                    events:

                              a sale as described in clause (i) under Change of
                              Control,

                              a dissolution or liquidation as described in
                              clause (ii),

                              an ownership change as described in clause (iii),
                              but with the percentage ownership increased to
                              100%

                              merger, consolidation, or reorganization of the
                              Company with one or more corporations or other
                              entities in which the Company is not the surviving
                              entity, or

________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 7 of 17
<PAGE>
                              any other transaction (including a merger or
                              reorganization in which the Company survives)
                              approved by the Board that results in any person
                              or entity (other than an Excluded Owner) owning
                              100% of Company Voting Securities.

LIMITATION ON       An Option granted to an employee will be an ISO only to the
ISOS                extent that the aggregate Fair Market Value (determined at
                    the Date of Grant) of the stock with respect to which ISOs
                    are exercisable for the first time by the optionee during
                    any calendar year (under the Plan and all other plans of
                    the Company and its subsidiary corporations, within the
                    meaning of Code Section 422(d)), does not exceed $100,000.
                    This limitation applies to Options in the order in which
                    such Options were granted. If, by design or operation, the
                    Option exceeds this limit, the excess will be treated as an
                    NQSO.

METHOD OF           To exercise any exercisable portion of an Option, the
EXERCISE            optionee must:

                           Deliver notice of exercise to the Secretary of the
                           Company (or to whomever the Administrator
                           designates), in a form complying with any rules
                           the Administrator may issue, signed or otherwise
                           authenticated by the optionee, and specifying the
                           number of shares of Common Stock underlying the
                           portion of the Option the optionee is exercising;

                           Pay the  full  Exercise  Price  by cash or a
                           cashier's or certified  check for the shares
                           of Common  Stock  with  respect to which the
                           Option  is  being   exercised,   unless  the
                           Administrator  consents  to another  form of
                           payment  (which could include loans from the
                           Company or the use of Common Stock); and

                           Deliver    to   the    Administrator    such
                           representations   and   documents   as   the
                           Administrator,  in its sole discretion,  may
                           consider necessary or advisable.

                    After an IPO, payment in full of the Exercise Price need not
                    accompany the written notice of exercise if the exercise
                    complies with a previously-approved cashless exercise
                    method, including, for example, that the notice directs that
                    the stock certificates (or other indicia of ownership) for
                    the shares issued upon the exercise be delivered to a
                    licensed broker acceptable to the Company as the agent for
                    the individual exercising the option and at the time the
                    stock certificates (or other indicia) are delivered to the
                    broker, the broker will tender to the Company cash or cash
                    equivalents acceptable to the Company and equal to the
                    Exercise Price and any required withholding taxes.


________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                   Page 8 of 17
<PAGE>
                    If the Administrator agrees to allow an optionee to pay
                    through tendering shares of Common Stock to the Company, the
                    individual can only tender stock he has held for at least
                    six months at the time of surrender. Shares of stock offered
                    as payment will be valued, for purposes of determining the
                    extent to which the optionee has paid the Exercise Price, at
                    their Fair Market Value on the date of exercise. The
                    Administrator may also, in its discretion, accept
                    attestation of ownership of Common Stock and issue a net
                    number of shares upon Option exercise, or, after an IPO, by
                    having a broker tender to the Company cash equal to the
                    exercise price and any withholding taxes.

OPTION              No one may exercise an Option more than ten years after its
EXPIRATION          Date of Grant (or five years for ISOs granted to 10% owners
                    covered by Code Sections 422(b)(6) and 424(d)). Unless the
                    Option Agreement provides otherwise, either initially or by
                    amendment, no one may exercise an Option after the first to
                    occur of:

          EMPLOYMENT          The 90th day after the date of termination of
          TERMINATION         employment (other than for death or Disability),
                              where termination of employment means the time
                              when the employer-employee or other
                              service-providing relationship between the
                              employee and the Company ends for any reason. The
                              Administrator may provide that Options terminate
                              immediately upon termination of employment for
                              "cause" under an employee's employment or
                              consultant's services agreement or under another
                              definition specified in the Option Agreement.
                              Unless the Option Agreement provides otherwise,
                              termination of employment does not include
                              instances in which the Company immediately rehires
                              a common law employee as an independent
                              contractor. The Administrator, in its sole
                              discretion, will determine all questions of
                              whether particular terminations or leaves of
                              absence are terminations of employment.

         GROSS MISCONDUCT     For the Company's termination of the optionee's
                              employment as a result of the optionee's Gross
                              Misconduct, the time of such termination. For
                              purposes of this Plan, "Gross Misconduct" means
                              the optionee has committed fraud,
                              misappropriation, embezzlement, or willful
                              misconduct that has resulted or is likely to
                              result in material harm to the Company;

                              committed or been indicted for or convicted of, or
                              pled guilty or no contest to, any misdemeanor

________________________________________________________________________________

                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                   Page 9 of 17
<PAGE>

                              (other than for minor infractions or traffic
                              violations) involving fraud, breach of trust,
                              misappropriation, or other similar activity, or
                              any felony; or committed an act of gross
                              negligence or otherwise acted with willful
                              disregard for the Company's best interests in a
                              manner that has resulted or is likely to result
                              in material harm to the Company.

                         If the optionee has a written employment agreement in
                         effect at the time of his termination that specifies
                         "cause" for termination, "Gross Misconduct" for
                         purposes of his termination will refer to "cause" under
                         the employment agreement, rather than to the foregoing
                         definition.


     DISABILITY         For disability, the earlier of (i) the first anniversary
                        of the optionee's termination of employment for
                        disability and (ii) 60 days after the optionee no longer
                        has a disability, where "disability" means the inability
                        to engage in any substantial gainful activity because of
                        any medically determinable physical or mental impairment
                        that can be expected to result in death or that has
                        lasted or can be expected to last for a continuous
                        period of not less than 12 months; or


     DEATH              The date 12 months after the optionee's death.


                    If exercise is permitted after termination of employment,
                    the Option will nevertheless expire as of the date that the
                    former service provider violates any covenant not to compete
                    or other post-employment covenant in effect between the
                    Company and the former service provider. In addition, an
                    optionee who exercises an Option more than 90 days after
                    termination of employment with the Company and/or Eligible
                    Subsidiaries will only receive ISO treatment to the extent
                    the law permits, and becoming or remaining an employee of
                    another related company (that is not an Eligible Subsidiary)
                    or an independent contractor will not prevent loss of ISO
                    status because of the formal termination of employment.

                    Nothing in this Plan extends the term of an Option beyond
                    the tenth anniversary of its Date of Grant, nor does
                    anything in this Option Expiration section make an Option
                    exercisable that has not otherwise become exercisable,
                    unless the Administrator specifies otherwise.
________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 10 of 17
<PAGE>
 OPTION             Option Agreements (which could be certificates) will set
 AGREEMENT          forth the terms of each Option and will include such terms
                    and conditions, consistent with the Plan, as the
                    Administrator may determine are necessary or advisable. To
                    the extent the agreement is inconsistent with the Plan, the
                    Plan will govern. The Option Agreements may contain special
                    rules.

PUT AND CALL        The  Administrator may provide in Option Agreements that the
RIGHTS              Company   has  the  right  (or   obligation)   to   purchase
                    outstanding  Options, or the shares received from exercising
                    an   Option,   under   certain   circumstances,    including
                    termination  of  employment  for any reason or death and may
                    provide for rights of first refusal.  The  Administrator may
                    distinguish between unexercisable and exercisable Options.

STOCK SUBJECT       Except  as  adjusted  below  under  Corporate  Changes,
TO PLAN
                         the aggregate number of shares of Common Stock
                         that may be subject to outstanding Options may not
                         exceed 20% of the shares of Common Stock issued
                         and outstanding as of the date on which the
                         Administrator seeks to make an additional grant
                         (provided that a decrease in shares outstanding
                         will not invalidate any previously issued Option),

                         the maximum number of shares that may be granted
                         under Options for a single individual in a
                         calendar year may not exceed 10% of the shares of
                         Common Stock outstanding at the closing of the
                         IPO, and

                         the aggregate number of shares of Common Stock that
                         may be issued under ISOs may not exceed 3,000,000.

                    The  Common  Stock  will come  from  either  authorized  but
                    unissued  shares or from  previously  issued shares that the
                    Company  reacquires,  including  shares it  purchases on the
                    open  market  or holds as  treasury  shares.  If any  Option
                    expires,  is canceled,  or terminates  for any other reason,
                    the shares of Common Stock  available under that Option will
                    again be available for the granting of new Options (but will
                    be counted  against that  calendar  year's limit for a given
                    individual).
________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 11 of 17
<PAGE>
                    No adjustment will be made for a dividend or other right for
                    which the record date precedes the date of exercise.

                    The  optionee  will  have no rights  of a  stockholder  with
                    respect to the shares of stock  subject to an Option  except
                    to the extent that the Company has issued  certificates for,
                    or otherwise  confirmed  ownership  of, such shares upon the
                    exercise of the Option.

                    The Company will not issue fractional shares pursuant to the
                    exercise of an Option,  unless the Administrator  determines
                    otherwise,  but the  Administrator  may, in its  discretion,
                    direct  the  Company  to  make a cash  payment  in  lieu  of
                    fractional shares.

 PERSON WHO         During the optionee's  lifetime and except as provided under
 MAY EXERCISE       Transfers,  Assignments,  and Pledges,  only the optionee or
                    his duly appointed  guardian or personal  representative may
                    exercise  the  Options.   After  his  death,   his  personal
                    representative  or any other person  authorized under a will
                    or under the laws of descent and  distribution  may exercise
                    any then exercisable  portion of an Option. If someone other
                    than the original recipient seeks to exercise any portion of
                    an Option,  the  Administrator  may request such proof as it
                    may consider  necessary or appropriate of the person's right
                    to exercise the Option.

ADJUSTMENTS         Subject to any  required  action by the Company  (which it
UPON CHANGES        agrees to promptly take) or its stockholders, and subject
IN CAPITAL          to the provisions of applicable  corporate  law, if, after
STOCK               the Date of Grant of an Option,

                         the outstanding shares of Common Stock increase or
                         decrease or change into or are exchanged for a
                         different number or kind of security because of
                         any recapitalization, reclassification, stock
                         split, reverse stock split, combination of shares,
                         exchange of shares, stock dividend, or other
                         distribution payable in capital stock, or

                         some other increase or decrease in such Common
                         Stock occurs without the Company's receiving
                         consideration (excluding, unless the Administrator
                         determines otherwise, stock repurchases),

                    the Administrator must make a proportionate and appropriate
                    adjustment  in  the  number  of  shares  of  Common   Stock
                    underlying each Option, so that the  proportionate interest
                    of the optionee  immediately following  such event will, to
                    the extent practicable,  be the same as immediately  before
                    such event. (This adjustment does not apply to Common Stock

_______________________________________________________________________________
                                                           Aether Systems, Inc.
                                                     1999 Equity Incentive Plan
                                                                  Page 12 of 17
<PAGE>

                    that the optionee has already purchased.) Unless the
                    Administrator determines another method would be
                    appropriate, any such adjustment to an Option will not
                    change the total price with respect to shares of Common
                    Stock underlying the unexercised portion of the Option but
                    will include a corresponding proportionate adjustment in the
                    Option's Exercise Price. The Board or other Administrator
                    may take any actions described in the Adjustments upon
                    Changes in Capital Stock section without any requirement to
                    seek optionee consent.

                    The  Administrator  will make a  commensurate  change to the
                    maximum  number  and kind of  shares  provided  in the Stock
                    Subject to Plan section.

                    All  references  to numbers of shares of Common Stock in the
                    Plan and in any  Option  grants  made on or  before  the IPO
                    Effective  Date assume the IPO is or will be  completed  and
                    thus relate to post-IPO numbers of shares.

                    Any issue by the Company of any class of preferred stock, or
                    securities  convertible  into shares of common or  preferred
                    stock of any class,  will not affect,  and no  adjustment by
                    reason  thereof  will be made with respect to, the number of
                    shares of Common Stock subject to any Option or the Exercise
                    Price  except  as  this  Adjustments  section   specifically
                    provides.  The  grant of an  Option  under the Plan will not
                    affect in any way the right or power of the  Company to make
                    adjustments,  reclassifications,  reorganizations or changes
                    of its  capital  or  business  structure,  or to merge or to
                    consolidate,  or to dissolve,  liquidate,  sell, or transfer
                    all or any part of its business or assets.

SUBSIDIARY          Employees  of  Company  Subsidiaries  will  be  entitled  to
EMPLOYEES           participate in the Plan,  except as otherwise  designated by
                    the Board of Directors or the Administrator.

                    Eligible    Subsidiary   means   each   of   the   Company's
                    Subsidiaries,   except   as  the   Administrator   otherwise
                    specifies. For ISO grants,  Subsidiary means any corporation
                    (other  than  the   Company)   in  an   unbroken   chain  of
                    corporations  beginning  with the Company if, at the time an
                    Option is  granted  to a  Participant  under the Plan,  each
                    corporation (other than the last corporation in the unbroken

________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 13 of 17
<PAGE>

                    chain)  owns  stock  possessing  50% or  more  of the  total
                    combined  voting  power of all  classes  of stock in another
                    corporation  in  such  chain.  For  ISOs,   Subsidiary  also
                    includes a single-member  limited liability company included
                    within the chain  described in the preceding  sentence.  The
                    Board or the Administrator may use a different definition of
                    Subsidiary for NQSOs.

LEGAL               The Company  will not issue any shares of Common Stock under
COMPLIANCE          an  Option  until all  applicable  requirements  imposed  by
                    Federal  and state  securities  and other laws,  rules,  and
                    regulations,  and by any applicable  regulatory  agencies or
                    stock  exchanges,  have been  fully  met.  To that end,  the
                    Company  may require  the  optionee  to take any  reasonable
                    action to comply with such requirements  before issuing such
                    shares.  No  provision  in the Plan or action taken under it
                    authorizes  any action that Federal or state laws  otherwise
                    prohibit.

                    The Plan is intended to conform to the extent necessary with
                    all provisions of the  Securities  Act of 1933  ("Securities
                    Act")  and  the  Securities  Exchange  Act of  1934  and all
                    regulations and rules the Securities and Exchange Commission
                    issues  under  those laws.  Notwithstanding  anything in the
                    Plan to the contrary,  the Administrator must administer the
                    Plan,  and Options may be granted and  exercised,  only in a
                    way that conforms to such laws,  rules, and regulations.  To
                    the extent  permitted  by  applicable  law, the Plan and any
                    Options  will be treated as amended to the extent  necessary
                    to conform to such laws, rules, and regulations.

PURCHASE FOR        Unless a registration statement under the Securities Act
INVESTMENT AND      covers the share of Common Stock an optionee receives upon
OTHER               exercising his Option, the Administrator may require, at the
RESTRICTIONS        time of such exercise, that the optionee agree in writing to
                    acquire such shares for investment and not for public resale
                    or distribution,  unless and until the shares subject to the
                    Option are registered  under the Securities  Act. Unless the
                    shares are registered under the Securities Act, the optionee
                    must  acknowledge:

                          that the shares purchased on exercise of the
                          Option are not so registered,

                          that the optionee may not sell or otherwise
                          transfer the shares unless

                              such sale or transfer complies with all applicable
                              laws, rules, and regulations, including all
                              applicable Federal and state securities laws,
                              rules, and regulations, and either

________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 14 of 17
<PAGE>

                              the shares have been registered under the
                              Securities Act in connection with the sale or
                              transfer thereof, or

                              counsel satisfactory to the Company has issued an
                              opinion satisfactory to the Company that the sale
                              or other transfer of such shares is exempt from
                              registration under the Securities Act.

                    Additionally,   the  Common  Stock,  when  issued  upon  the
                    exercise of an Option, will be subject to any other transfer
                    restrictions,   rights  of  first  refusal,  and  rights  of
                    repurchase  set forth in or  incorporated  by reference into
                    other applicable documents, including the Option Agreements,
                    or the Company's  articles or certificate of  incorporation,
                    by-laws, or generally applicable stockholders' agreements.

                    The Administrator may, in its sole discretion, take whatever
                    additional  actions it deems appropriate to comply with such
                    restrictions and applicable laws,  including placing legends
                    on  certificates   and  issuing  stop-  transfer  orders  to
                    transfer agents and registrars.

TAX WITHHOLDING     The optionee must satisfy all applicable Federal, state, and
                    local income and  employment  tax  withholding  requirements
                    before  the  Company  will  deliver  stock  certificates  or
                    otherwise  recognize  ownership  upon  the  exercise  of  an
                    Option.  The Company  may decide to satisfy the  withholding
                    obligations  through  additional  withholding  on  salary or
                    wages. If the Company does not or cannot withhold from other
                    compensation,  the  optionee  must pay the  Company,  with a
                    cashier's  check or certified  check,  the full amounts,  if
                    any,  required  for  withholding.   Payment  of  withholding
                    obligations  is due at the same  time as is  payment  of the
                    Exercise  Price.  If the  Administrator  so determines,  the
                    optionee may instead satisfy the withholding  obligations by
                    directing  the  Company  to retain  shares  from the  Option
                    exercise,  by  tendering  previously  owned  shares,  or  by
                    attesting to his ownership of shares (with the  distribution
                    of net shares),  or, after an IPO, by having a broker tender
                    to the Company cash equal to the withholding taxes.

TRANSFERS,          Unless the  Administrator  otherwise  approves in advance in
ASSIGNMENTS,        writing for estate planning or other purposes, an Option may
AND PLEDGES         not be assigned, pledged or otherwise transferred in any
                    way, whether by operation of law or otherwise or through any
                    legal or equitable proceedings  (including  bankruptcy),  by
                    the  optionee to any person,  except by will or by operation
                    of applicable laws of descent and distribution. If necessary
                    to comply with Rule 16b-3,  the optionee may not transfer or
                    pledge  shares of Common Stock  acquired upon exercise of an
                    Option  until at least six  months  have  elapsed  from (but
                    excluding)  the  Date of  Grant,  unless  the  Administrator
                    approves otherwise in advance in writing.  The Administrator
                    may, in its discretion,  expressly  provide that an optionee
                    may transfer his Option, without receiving consideration, to

________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 15 of 17
<PAGE>
                   (i)   members   of   his   immediate    family    (children,
                    grandchildren,  or  spouse),  (ii) trusts for the benefit of
                    such  family  members,  or  (iii)  partnerships  whose  only
                    partners are such family members.

AMENDMENT OR        The Board may amend, suspend, or terminate the Plan at any
TERMINATION         time, without the consent of the optionees or their
OF PLAN AND         beneficiaries; provided, however, that such actions are
OPTIONS             consistent with this section. Except as required by law or
                    by the SUBSTANTIAL CORPORATE CHANGES section, the
                    Administrator may not, without the optionee's or
                    beneficiary's consent, modify the terms and conditions of an
                    Option so as to materially adversely affect the optionee. No
                    amendment, suspension, or termination of the Plan will,
                    without the optionee's or beneficiary's consent, terminate
                    or materially adversely affect any right or obligations
                    under any outstanding Options, except as provided in the
                    SUBSTANTIAL CORPORATE CHANGES Section.

PRIVILEGES OF      No optionee and no  beneficiary  or other  person  claiming
STOCK              under or through such optionee  will have any right,  title,
OWNERSHIP          or interest in or to any shares of Common Stock allocated or
                   reserved  under the Plan or subject to any Option  except as
                   to such shares of Common Stock,  if any,  already  issued to
                   such optionee.

EFFECT ON          Whether  exercising  an Option causes the optionee to accrue
OTHER PLANS        or receive  additional  benefits  under any pension or other
                   plan is governed solely by the terms of such other plan.

LIMITATIONS ON     Notwithstanding   any  other  provisions  of  the  Plan,  no
LIABILITY          individual acting as a director, officer, other employee, or
                   agent of the Company will be liable to any optionee,  former
                   optionee, spouse,  beneficiary,  or any other person for any
                   claim,  loss,  liability,  or expense incurred in connection
                   with the Plan, nor will such individual be personally liable
                   because of any contract or other  instrument  he executes in
                   such other  capacity.  The Company will  indemnify  and hold
                   harmless each director, officer, other employee, or agent of
                   the  Company  to whom  any  duty or  power  relating  to the
                   administration  or  interpretation  of the  Plan has been or
                   will be  delegated,  against any cost or expense  (including
                   attorneys'  fees) or  liability  (including  any sum paid in
                   settlement of a claim with the Board's approval) arising out
                   of any act or  omission to act  concerning  this Plan unless
                   arising out of such person's own fraud or bad faith.

NO EMPLOYMENT      Nothing contained in this Plan constitutes an employment
CONTRACT           contract between the Company and the optionees. The Plan
                   does not give any optionee any right to be retained in the
                   Company's employ, nor does it enlarge or diminish the
                   Company's right to end the optionee's employment or other
                   relationship with the Company.

________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 16 of 17
<PAGE>

APPLICABLE LAW    The laws of the State of Delaware (other than its choice of
                  law provisions) govern this Plan and its interpretation.

DURATION OF       Unless the Board extends the Plan's term, the Administrator
PLAN              may not grant Options after  September 20, 2009. The Plan
                  will then terminate but will continue to govern unexercised
                  and unexpired Options.

APPROVAL OF       The Plan must be submitted to Company stockholders for their
THE PLAN           approval  within 12 months  before or after the Board adopts
                  the  Plan to  qualify  any  Options  designated  as ISOs for
                  treatment as such. If the stockholders do not so approve the
                  Plan, the Plan and any  outstanding  ISOs will be treated as
                  void and of no effect.


























________________________________________________________________________________
                                                            Aether Systems, Inc.
                                                      1999 Equity Incentive Plan
                                                                  Page 17 of 17





                           WILMER, CUTLER & PICKERING
                              2445 M Street, N.W.
                          Washington, D.C. 20037-1420
                            Telephone (202) 663-6000
                            Facsimile (202) 663-6363


                                November 18, 1999


Aether Systems, Inc.
11460 Cronridge Drive, Suite 106
Owings Mills, Maryland  21117

                  Re:    Aether Systems, Inc. Registration Statement on Form S-8

Dear Ladies and Gentlemen:

                  We have acted as counsel to Aether Systems,  Inc., a Delaware
corporation (the "Company"), in connection with a registration statement on Form
S-8 (the "Registration  Statement") to be filed with the Securities and Exchange
Commission (the "Commission") under the Securities Act of 1933, as amended.  The
Registration Statement relates to the registration of the shares of Common Stock
of the Company, par value $0.01 per share (the "Shares"), to be issued under the
Company's 1999 Equity Incentive Plan (the "1999 Plan").

                  For the purposes of this opinion,  we have examined and relied
upon the following documents,  as certified by the Secretary of the Company on
November, as then being complete, accurate and in effect:

                  (1)      a copy of the 1999 Plan; and

                  (2)      a copy of the  Resolutions  of the Board of Directors
                           dated September 20, 1999 adopting the Plan.

                  In our examination of the aforesaid documents, we have assumed
the genuineness of all signatures,  the legal capacity of natural  persons,  the
authenticity of all documents  submitted to us as originals,  and the conformity
with the original  documents  of all  documents  submitted  to us as  certified,
telecopied,  photostatic,  or reproduced copies. We have assumed the accuracy of
the  foregoing  certifications,  on  which  we are  relying,  and  have  made no
independent investigation thereof.

                  Based solely upon the foregoing,  and upon our  examination of
such  questions  of  law  and  statutes  as  we  have  considered  necessary  or
appropriate, and subject to the


<PAGE>

Aether Systems, Inc.
November 18, 1999
Page 2


assumptions,  qualifications,  limitations,  and  exceptions  set  forth in this
letter,  we are of the opinion that:  (a) the Shares have been lawfully and duly
authorized;  and (b)  such  Shares  will be  validly  issued,  fully  paid,  and
nonassessable  upon payment of the  purchase  price  established  under the 1999
Plan.

                  This opinion is limited to the laws of the United States and
the General Corporation Law of Delaware.  Although we do not hold ourselves out
as being experts in the Laws of  Delaware, we have made an investigation of such
laws to the extent necessary to render our opinion.  Our opinion is rendered
only with respect to the laws and the rules, regulations, and orders thereunder
that are currently in effect.

                  We assume no  obligation  to advise you of any  changes in the
foregoing  subsequent  to the  delivery of this  opinion.  This opinion has been
prepared  for  your  use in  connection  with  the  filing  of the  Registration
Statement on or about November 19, 1999,  and should not be quoted in whole or
in part or otherwise be referred to, nor otherwise be filed with or furnished
to any governmental agency or other person or entity, without our express prior
written consent.

                  We hereby  consent to the filing of this opinion as an exhibit
to the Registration Statement.

                                            Sincerely,

                                            WILMER, CUTLER & PICKERING



                                            By:  /s/ R. Scott Kilgore
                                                 ----------------------------
                                                  R. Scott Kilgore, a partner





                                                            Exhibit 23.1




                       CONSENT OF INDEPENDENT ACCOUNTANTS


The Board of Directors
Aether Systems, Inc.

We consent to the use of our reports incorporated herein by reference, which
reports appear in Amendment No. 5 to the Form S-1 (No. 333-85697) of Aether
Systems, Inc. dated October 20, 1999.


                                   /s/ KPMG LLP

McLean, Virginia
November 19, 1999




                                                            Exhibit 23.2




                       CONSENT OF INDEPENDENT ACCOUNTANTS



We hereby consent to the incorporation by reference in this Registration
Statement on Form S-8 of Aether Systems, Inc. of our report dated March 10, 1999
relating to the financial statements of Mobeo, Inc. as of December 31, 1997 and
1998 and the three years in the period ended December 31, 1998.



/s/ PricewaterhouseCoopers LLP




McLean, Virginia
November 19, 1999



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