EXHIBIT 99.4

                              BERKANA WIRELESS INC.

                                 2002 STOCK PLAN

                          NOTICE OF STOCK OPTION GRANT


Name

      You have been granted an option to purchase Common Stock of Berkana
Wireless Inc. (the "Company") as follows:

      Board Approval Date:              Date

      Date of Grant (Later of Board
      Approval Date or Commencement
      of Employment/Consulting):        Date

      Exercise Price per Share:         $ .25

      Total Number of Shares Granted:

      Total Exercise Price:             $

      Type of Option:                   ________Shares Incentive Stock Option

                                        0 Shares Nonstatutory Stock Option

      Term/Expiration Date:

      Vesting Commencement Date:

      Vesting/Exercise Schedule:        THIS OPTION MAY BE EXERCISED, IN WHOLE
                                        OR IN PART, AT ANY TIME: SIX (6) MONTHS
                                        AND TWO (2) DAYS AFTER THE DATE OF GRANT
                                        (I.E., MAY 12, 2004). So long as your
                                        employment or consulting relationship
                                        with the Company continues, the Shares
                                        underlying this Option shall vest in
                                        accordance with the following schedule:
                                        1/4th of the total number of Shares
                                        subject to the Option shall vest on the
                                        12 month anniversary of the Vesting
                                        Commencement Date and 1/48th of the
                                        total number of Shares subject to the
                                        Option shall vest each month thereafter.

      Termination Period:               This Option may be exercised for three
                                        months after termination of employment
                                        or consulting relationship except as set
                                        out in Section 5 of the Stock Option
                                        Agreement (but in no event later than
                                        the Expiration Date). Optionee is
                                        responsible for keeping track of these
                                        exercise periods following termination
                                        for any reason of his or her service
                                        relationship with the Company. The
                                        Company will not provide further notice
                                        of such periods.

      Transferability:                  This Option may not be transferred.


      By your signature and the signature of the Company's representative below,
you and the Company agree that this option is granted under and governed by the
terms and conditions of the Berkana Wireless Inc. 2002 Stock Plan and the Stock
Option Agreement, both of which are attached and made a part of this document.

      In addition, you agree and acknowledge that your rights to any Shares
underlying the Option will be earned only as you provide services to the Company
over time, that the grant of the Option is not as consideration for services you
rendered to the Company prior to your Vesting Commencement Date, and that
nothing in this Notice or the attached documents confers upon you any right to
continue your employment or consulting relationship with the Company for any
period of time, nor does it interfere in any way with your right or the
Company's right to terminate that relationship at any time, for any reason, with
or without cause.



                                        BERKANA WIRELESS INC.

                                        By:
- ------------------------------              -----------------------------
Name                                    Name:
                                              ---------------------------
                                        Title:
                                               --------------------------



                                      -2-

                              BERKANA WIRELESS INC.

                                 2002 STOCK PLAN

                             STOCK OPTION AGREEMENT

      1. GRANT OF OPTION. Berkana Wireless Inc., a Delaware corporation (the
"Company"), hereby grants to Name ("Optionee"), an option (the "Option") to
purchase the total number of shares of Common Stock (the "Shares") set forth in
the Notice of Stock Option Grant (the "Notice"), at the exercise price per Share
set forth in the Notice (the "Exercise Price") subject to the terms, definitions
and provisions of Berkana Wireless Inc. 2002 Stock Plan (the "Plan") adopted by
the Company, which is incorporated in this Agreement by reference. Unless
otherwise defined in this Agreement, the terms used in this Agreement shall have
the meanings defined in the Plan.

      2. DESIGNATION OF OPTION. This Option is intended to be an Incentive Stock
Option as defined in Section 422 of the Code only to the extent so designated in
the Notice, and to the extent it is not so designated or to the extent the
Option does not qualify as an Incentive Stock Option, it is intended to be a
Nonstatutory Stock Option.

      Notwithstanding the above, if designated as an Incentive Stock Option, in
the event that the Shares subject to this Option (and all other Incentive Stock
Options granted to Optionee by the Company or any Parent or Subsidiary,
including under other plans of the Company) that first become exercisable in any
calendar year have an aggregate fair market value (determined for each Share as
of the date of grant of the option covering such Share) in excess of $100,000,
the Shares in excess of $100,000 shall be treated as subject to a Nonstatutory
Stock Option, in accordance with Section 5 of the Plan.

      3. EXERCISE OF OPTION. This Option shall be exercisable during its term in
accordance with the Vesting/Exercise Schedule set out in the Notice and with the
provisions of the Plan as follows:

            (a) RIGHT TO EXERCISE.

                  (i) This Option may not be exercised for a fraction of a
share.

                  (ii) In the event of Optionee's death, disability or other
termination of employment, the exercisability of the Option is governed by
Section 5 below, subject to the limitations contained in this Section 3.

                  (iii) In no event may this Option be exercised after the
Expiration Date of the Option as set forth in the Notice.

            (b) METHOD OF EXERCISE.

                  (i) This Option shall be exercisable by execution and delivery
of the Early Exercise Notice and Restricted Stock Purchase Agreement attached
hereto as Exhibit A, the Exercise Notice and Restricted Stock Purchase Agreement
attached hereto as Exhibit B, or any other form of written notice approved for
such purpose by the Company which shall state Optionee's election to exercise
the Option, the number of Shares in respect of which the Option is being
exercised, and such other representations and agreements as to the holder's
investment intent with respect to such Shares as may be required by the Company
pursuant to the provisions of the Plan. Such written notice shall be

signed by Optionee and shall be delivered to the Company by such means as are
determined by the Plan Administrator in its discretion to constitute adequate
delivery. The written notice shall be accompanied by payment of the Exercise
Price. This Option shall be deemed to be exercised upon receipt by the Company
of such written notice accompanied by the Exercise Price.

                  (ii) As a condition to the exercise of this Option and as
further set forth in Section 12 of the Plan, Optionee agrees to make adequate
provision for federal, state or other tax withholding obligations, if any, which
arise upon the vesting or exercise of the Option, or disposition of Shares,
whether by withholding, direct payment to the Company, or otherwise.

                  (iii) The Company is not obligated, and will have no liability
for failure, to issue or deliver any Shares upon exercise of the Option unless
such issuance or delivery would comply with the applicable lawsapplicable laws,
with such compliance determined by the Company in consultation with its legal
counsel. This Option may not be exercised until such time as the Plan has been
approved by the stockholders of the Company, or if the issuance of such Shares
upon such exercise or the method of payment of consideration for such shares
would constitute a violation of any applicable federal or state securities or
other law or regulation, including any rule under Part 221 of Title 12 of the
Code of Federal Regulations as promulgated by the Federal Reserve Board. As a
condition to the exercise of this Option, the Company may require Optionee to
make any representation and warranty to the Company as may be required by the
applicable laws. Assuming such compliance, for income tax purposes the Shares
shall be considered transferred to Optionee on the date on which the Option is
exercised with respect to such Shares.

      4. METHOD OF PAYMENT. Payment of the Exercise Price shall be by any of the
following, or a combination of the following, at the election of Optionee:

            (a) cash or check;

            (b) prior to the date, if any, upon which the Common Stock becomes a
Listed Security, by surrender of other shares of Common Stock of the Company
that have an aggregate Fair Market Value on the date of surrender equal to the
Exercise Price of the Shares as to which the Option is being exercised. In the
case of shares acquired directly or indirectly from the Company, such shares
must have been owned by Optionee for more than six (6) months on the date of
surrender (or such other period of time as is necessary to avoid the Company's
incurring adverse accounting charges); or

            (c) following the date, if any, upon which the Common Stock is a
Listed Security, delivery of a properly executed exercise notice together with
irrevocable instructions to a broker approved by the Company to deliver promptly
to the Company the amount of sale or loan proceeds required to pay the exercise
price.

      5. TERMINATION OF RELATIONSHIP. Following the date of termination of
Optionee's Continuous Service Status for any reason (the "Termination Date"),
Optionee may exercise the Option only as set forth in the Notice and this
Section 5. To the extent that Optionee is not entitled to exercise this Option
as of the Termination Date, or if Optionee does not exercise this Option within
the Termination Period set forth in the Notice or the termination periods set
forth below, the Option shall terminate in its entirety. In no event, may any
Option be exercised after the Expiration Date of the Option as set forth in the
Notice.

            (a) TERMINATION. In the event of termination of Optionee's
Continuous Service Status other than as a result of Optionee's disability or
death or for Cause (as defined in Section 10(b)(iv)



                                      -2-

of the Plan), Optionee may, to the extent otherwise so entitled at the date of
such termination (the "Termination Date"), exercise this Option during the
Termination Period set forth in the Notice.

            (b) OTHER TERMINATIONS. In connection with any termination other
than a termination covered by Section 5(a), Optionee may exercise the Option
only as described below:

                  (i) TERMINATION UPON DISABILITY OF OPTIONEE. In the event of
termination of Optionee's Continuous Service Status as a result of Optionee's
disability, Optionee may, but only within six months from the Termination Date,
exercise this Option to the extent Optionee was entitled to exercise it as of
such Termination Date.

                  (ii) DEATH OF OPTIONEE. In the event of the death of Optionee
(a) during the term of this Option and while an Employee or Consultant of the
Company and having been in Continuous Service Status since the date of grant of
the Option, or (b) within thirty (30) days after Optionee's Termination Date,
the Option may be exercised at any time within twelve months following the date
of death by Optionee's estate or by a person who acquired the right to exercise
the Option by bequest or inheritance, but only to the extent Optionee was
entitled to exercise the Option as of the Termination Date.

                  (iii) TERMINATION FOR CAUSE. In the event Optionee's
Continuous Service Status is terminated for Cause (as defined in Section
10(b)(iv) of the Plan), the Option shall terminate immediately upon such
termination for Cause. In the event Optionee's employment or consulting
relationship with the Company is suspended pending investigation of whether such
relationship shall be terminated for Cause, all Optionee's rights under the
Option, including the right to exercise the Option, shall be suspended during
the investigation period.

      6. NON-TRANSFERABILITY OF OPTION. Except as otherwise set forth in this
Notice, this Option may not be transferred in any manner otherwise than by will
or by the laws of descent or distribution and may be exercised during the
lifetime of Optionee only by him or her. The terms of this Option shall be
binding upon the executors, administrators, heirs, successors and assigns of
Optionee.

      7. TAX CONSEQUENCES. Below is a brief summary as of the date of this
Option of certain of the federal tax consequences of exercise of this Option and
disposition of the Shares under the laws in effect as of the Date of Grant. THIS
SUMMARY IS INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE.
OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING
OF THE SHARES.

            (a) INCENTIVE STOCK OPTION.

                  (i) TAX TREATMENT UPON EXERCISE AND SALE OF SHARES. If this
Option qualifies as an Incentive Stock Option, there will be no regular federal
income tax liability upon the exercise of the Option, although the excess, if
any, of the fair market value of the Shares on the date of exercise over the
Exercise Price will be treated as an adjustment to the alternative minimum tax
for federal tax purposes and may subject Optionee to the alternative minimum tax
in the year of exercise. If Shares issued upon exercise of an Incentive Stock
Option are held for at least one year after exercise and are disposed of at
least two years after the Option grant date, any gain realized on disposition of
the Shares will also be treated as long-term capital gain for federal income tax
purposes. If Shares issued upon exercise of an Incentive Stock Option are
disposed of within such one-year period or within two years after the Option
grant date, any gain realized on such disposition will be treated as
compensation income (taxable at ordinary income rates) to the extent of the
difference between the Exercise Price and



                                      -3-

the lesser of (i) the fair market value of the Shares on the date of exercise,
or (ii) the sale price of the Shares.

                  (ii) NOTICE OF DISQUALIFYING DISPOSITIONS. With respect to any
Shares issued upon exercise of an Incentive Stock Option, if Optionee sells or
otherwise disposes of such Shares on or before the later of (i) the date two
years after the Option grant date, or (ii) the date one year after the date of
exercise, Optionee shall immediately notify the Company in writing of such
disposition. Optionee acknowledges and agrees that he or she may be subject to
income tax withholding by the Company on the compensation income recognized by
Optionee from the early disposition by payment in cash or out of the current
earnings paid to Optionee.

            (b) NONSTATUTORY STOCK OPTION. If this Option does not qualify as an
Incentive Stock Option, there may be a regular federal (and state) income tax
liability upon the exercise of the Option. Optionee will be treated as having
received compensation income (taxable at ordinary income tax rates) equal to the
excess, if any, of the fair market value of the Shares on the date of exercise
over the Exercise Price. If Optionee is an Employee, the Company will be
required to withhold from Optionee's compensation or collect from Optionee and
pay to the applicable taxing authorities an amount equal to a percentage of this
compensation income at the time of exercise. If Shares issued upon exercise of a
Nonstatutory Stock Option are held for at least one year, any gain realized on
disposition of the Shares will be treated as long-term capital gain for federal
income tax purposes.

      8. LOCK-UP AGREEMENT. In connection with the initial public offering of
the Company's securities and upon request of the Company or the underwriters
managing any underwritten offering of the Company's securities, Optionee hereby
agrees not to sell, make any short sale of, loan, grant any option for the
purchase of, or otherwise dispose of any securities of the Company however and
whenever acquired (other than those included in the registration) without the
prior written consent of the Company or such underwriters, as the case may be,
for such period of time (not to exceed 180 days) from the effective date of such
registration as may be requested by the Company or such managing underwriters
and to execute an agreement reflecting the foregoing as may be requested by the
underwriters at the time of the public offering.

      9. EFFECT OF AGREEMENT. Optionee acknowledges receipt of a copy of the
Plan and represents that he or she is familiar with the terms and provisions
thereof (and has had an opportunity to consult counsel regarding the Option
terms), and hereby accepts this Option and agrees to be bound by its contractual
terms as set forth herein and in the Plan. Optionee hereby agrees to accept as
binding, conclusive and final all decisions and interpretations of the Plan
Administrator regarding any questions relating to the Option. In the event of a
conflict between the terms and provisions of the Plan and the terms and
provisions of the Notice and this Agreement, the Plan terms and provisions shall
prevail. The Option, including the Plan, constitutes the entire agreement
between Optionee and the Company on the subject matter hereof and supersedes all
proposals, written or oral, and all other communications between the parties
relating to such subject matter.



                            [Signature Page Follows]




                                      -4-

      This Agreement may be executed in two or more counterparts, each of which
shall be deemed an original and all of which together shall constitute one
document.

Name                          BERKANA WIRELESS INC.


                                    By:
- ------------------------------         ---------------------------------
                                    Name:
                                         -------------------------------
Dated:  November 10, 2003           Title:
                                          ------------------------------




                                      -5-

                                    EXHIBIT A

                              BERKANA WIRELESS INC.

                                 2002 STOCK PLAN

          EARLY EXERCISE NOTICE AND RESTRICTED STOCK PURCHASE AGREEMENT

      This Agreement ("Agreement") is made as of ____________________, by and
between Berkana Wireless Inc., a Delaware corporation (the "Company"), and Name
("Purchaser"). To the extent any capitalized terms used in this Agreement are
not defined, they shall have the meaning ascribed to them in the 2002 Stock
Plan.

      1. EXERCISE OF OPTION. Subject to the terms and conditions hereof,
Purchaser hereby elects to exercise his or her option to purchase ____________
shares of the Common Stock (the "Shares") of the Company under and pursuant to
the Company's 2002 Stock Plan (the "Plan") and the Stock Option Agreement dated
Date (the "Option Agreement"). Of these Shares, Purchaser has elected to
purchase _______________ of those Shares which have become vested as of the date
hereof under the Vesting Schedule set forth in the Notice of Stock Option Grant
(the "Vested Shares") and _____________ Shares which have not yet vested under
such Vesting Schedule (the "Unvested Shares"). The purchase price for the Shares
shall be $.25 per Share for a total purchase price of $___________. The term
"Shares" refers to the purchased Shares and all securities received in
replacement of the Shares or as stock dividends or splits, all securities
received in replacement of the Shares in a recapitalization, merger,
reorganization, exchange or the like, and all new, substituted or additional
securities or other properties to which Purchaser is entitled by reason of
Purchaser's ownership of the Shares.

      2. TIME AND PLACE OF EXERCISE. The purchase and sale of the Shares under
this Agreement shall occur at the principal office of the Company simultaneously
with the execution and delivery of this Agreement in accordance with the
provisions of Section 3(b) of the Option Agreement. On such date, the Company
will deliver to Purchaser a certificate representing the Shares to be purchased
by Purchaser (which shall be issued in Purchaser's name) against payment of the
exercise price therefor by Purchaser by (a) check made payable to the Company,
(b) cancellation of indebtedness of the Company to Purchaser, (c) delivery of
shares of the Common Stock of the Company in accordance with Section 4 of the
Option Agreement, or (d) a combination of the foregoing.

      3. LIMITATIONS ON TRANSFER. In addition to any other limitation on
transfer created by applicable securities laws, Purchaser shall not assign,
encumber or dispose of any interest in the Shares while the Shares are subject
to the Company's Repurchase Option (as defined below). After any Shares have
been released from such Repurchase Option, Purchaser shall not assign, encumber
or dispose of any interest in such Shares except in compliance with the
provisions below and applicable securities laws.

            (a) REPURCHASE OPTION.

                  (i) In the event of the voluntary or involuntary termination
of Purchaser's employment or consulting relationship with the Company for any
reason (including death or disability), with or without cause, the Company shall
upon the date of such termination (the "Termination Date") have an irrevocable,
exclusive option (the "Repurchase Option") for a period of 90 days from such
date to repurchase all or any portion of the Shares held by Purchaser as of the
Termination Date which have not yet been released from the Company's Repurchase
Option at the original purchase price per Share specified in Section 1 (adjusted
for any stock splits, stock dividends and the like).

                  (ii) Unless the Company notifies Purchaser within 90 days from
the date of termination of Purchaser's employment or consulting relationship
that it does not intend to exercise its Repurchase Option with respect to some
or all of the Shares, the Repurchase Option shall be deemed automatically
exercised by the Company as of the 90th day following such termination. However,
the Company may notify Purchaser that it is exercising its Repurchase Option as
of a date prior to such 90th day. Unless Purchaser is otherwise notified by the
Company pursuant to the preceding sentence that the Company does not intend to
exercise its Repurchase Option as to some or all of the Shares to which it
applies at the time of termination, execution of this Agreement by Purchaser
constitutes written notice to Purchaser of the Company's intention to exercise
its Repurchase Option with respect to all Shares to which such Repurchase Option
applies. The Company, at its choice, may satisfy its payment obligation to
Purchaser with respect to exercise of the Repurchase Option by either (A)
delivering a check to Purchaser in the amount of the purchase price for the
Shares being repurchased, or (B) in the event Purchaser is indebted to the
Company, canceling an amount of such indebtedness equal to the purchase price
for the Shares being repurchased, or (C) by a combination of (A) and (B) so that
the combined payment and cancellation of indebtedness equals such purchase
price. In the event of any deemed automatic exercise of the Repurchase Option
pursuant to this Section 3(a)(ii) in which Purchaser is indebted to the Company,
such indebtedness equal to the purchase price of the Shares being repurchased
shall be deemed automatically canceled as of the 90th day following termination
of Purchaser's employment or consulting relationship unless the Company
otherwise satisfies its payment obligations. As a result of any repurchase of
Shares pursuant to this Section 3(a), the Company shall become the legal and
beneficial owner of the Shares being repurchased and shall have all rights and
interest therein or related thereto, and the Company shall have the right to
transfer to its own name the number of Shares being repurchased by the Company,
without further action by Purchaser.

                  (iii) One hundred percent (100%) of the Shares shall initially
be subject to the Repurchase Option. The Vested Shares shall be released from
the Repurchase Option in accordance with the Vesting Schedule set forth in the
Notice of Stock Option Grant until all Shares are released from the Repurchase
Option. Fractional shares shall be rounded down to the nearest whole share.

            (b) RIGHT OF FIRST REFUSAL. Before any Shares held by Purchaser or
any transferee of Purchaser (either being sometimes referred to herein as the
"Holder") may be sold or otherwise transferred (including transfer by gift or
operation of law), the Company or its assignee(s) shall have a right of first
refusal to purchase the Shares on the terms and conditions set forth in this
Section 3(b) (the "Right of First Refusal").

                  (i) NOTICE OF PROPOSED TRANSFER. The Holder of the Shares
shall deliver to the Company a written notice (the "Notice") stating: (i) the
Holder's bona fide intention to sell or otherwise transfer such Shares; (ii) the
name of each proposed purchaser or other transferee ("Proposed Transferee");
(iii) the number of Shares to be transferred to each Proposed Transferee; and
(iv) the terms and conditions of each proposed sale or transfer. The Holder
shall offer the Shares at the same price (the "Offered Price") and upon the same
terms (or terms as similar as reasonably possible) to the Company or its
assignee(s).

                  (ii) EXERCISE OF RIGHT OF FIRST REFUSAL. At any time within 30
days after receipt of the Notice, the Company and/or its assignee(s) may, by
giving written notice to the Holder, elect to purchase all, but not less than
all, of the Shares proposed to be transferred to any one or more of the Proposed
Transferees, at the purchase price determined in accordance with subsection
(iii) below.

                  (iii) PURCHASE PRICE. The purchase price ("Purchase Price")
for the Shares purchased by the Company or its assignee(s) under this Section
3(b) shall be the Offered Price. If the

                                      -2-

Offered Price includes consideration other than cash, the cash equivalent value
of the non-cash consideration shall be determined by the Board of Directors of
the Company in good faith.

                  (iv) PAYMENT. Payment of the Purchase Price shall be made, at
the option of the Company or its assignee(s), in cash (by check), by
cancellation of all or a portion of any outstanding indebtedness, or by any
combination thereof within 30 days after receipt of the Notice or in the manner
and at the times set forth in the Notice.

                  (v) HOLDER'S RIGHT TO TRANSFER. If all of the Shares proposed
in the Notice to be transferred to a given Proposed Transferee are not purchased
by the Company and/or its assignee(s) as provided in this Section 3(b), then the
Holder may sell or otherwise transfer such Shares to that Proposed Transferee at
the Offered Price or at a higher price, provided that such sale or other
transfer is consummated within 60 days after the date of the Notice and provided
further that any such sale or other transfer is effected in accordance with any
applicable securities laws and the Proposed Transferee agrees in writing that
the provisions of this Section 3 shall continue to apply to the Shares in the
hands of such Proposed Transferee. If the Shares described in the Notice are not
transferred to the Proposed Transferee within such period, or if the Holder
proposes to change the price or other terms to make them more favorable to the
Proposed Transferee, a new Notice shall be given to the Company, and the Company
and/or its assignees shall again be offered the Right of First Refusal before
any Shares held by the Holder may be sold or otherwise transferred.

                  (vi) EXCEPTION FOR CERTAIN FAMILY TRANSFERS. Anything to the
contrary contained in this Section 3(b) notwithstanding, the transfer of any or
all of the Shares during Purchaser's lifetime or on Purchaser's death by will or
intestacy to Purchaser's Immediate Family or a trust for the benefit of
Purchaser's Immediate Family shall be exempt from the provisions of this Section
3(b). "Immediate Family" as used herein shall mean spouse, lineal descendant or
antecedent, father, mother, brother or sister. In such case, the transferee or
other recipient shall receive and hold the Shares so transferred subject to the
provisions of this Section, and there shall be no further transfer of such
Shares except in accordance with the terms of this Section 3.

            (c) INVOLUNTARY TRANSFER.

                  (i) COMPANY'S RIGHT TO PURCHASE UPON INVOLUNTARY TRANSFER. In
the event, at any time after the date of this Agreement, of any transfer by
operation of law or other involuntary transfer (including death or divorce, but
excluding a transfer to Immediate Family as set forth in Section 3(b)(vi) above)
of all or a portion of the Shares by the record holder thereof, the Company
shall have an option to purchase all of the Shares transferred at the greater of
the purchase price paid by Purchaser pursuant to this Agreement or the Fair
Market Value of the Shares on the date of transfer. Upon such a transfer, the
person acquiring the Shares shall promptly notify the Secretary of the Company
of such transfer. The right to purchase such Shares shall be provided to the
Company for a period of thirty (30) days following receipt by the Company of
written notice by the person acquiring the Shares.

                  (ii) PRICE FOR INVOLUNTARY TRANSFER. With respect to any stock
to be transferred pursuant to Section 3(c)(i), the price per Share shall be a
price set by the Board of Directors of the Company that will reflect the current
value of the stock in terms of present earnings and future prospects of the
Company. The Company shall notify Purchaser or his or her executor of the price
so determined within thirty (30) days after receipt by it of written notice of
the transfer or proposed transfer of Shares. However, if the Purchaser does not
agree with the valuation as determined by the Board of Directors of the Company,
the Purchaser shall be entitled to have the valuation determined by an
independent appraiser to be mutually agreed upon by the Company and the
Purchaser and whose fees shall be borne equally by the Company and the
Purchaser.


                                      -3-

            (d) ASSIGNMENT. The right of the Company to purchase any part of the
Shares may be assigned in whole or in part to any shareholder or shareholders of
the Company or other persons or organizations.

            (e) RESTRICTIONS BINDING ON TRANSFEREES. All transferees of Shares
or any interest therein will receive and hold such Shares or interest subject to
the provisions of this Agreement, including, insofar as applicable, the
Repurchase Option. In the event of any purchase by the Company hereunder where
the Shares or interest are held by a transferee, the transferee shall be
obligated, if requested by the Company, to transfer the Shares or interest to
the Purchaser for consideration equal to the amount to be paid by the Company
hereunder. In the event the Repurchase Option is deemed exercised by the Company
pursuant to Section 3(a)(ii) hereof, the Company may deem any transferee to have
transferred the Shares or interest to Purchaser prior to their purchase by the
Company, and payment of the purchase price by the Company to such transferee
shall be deemed to satisfy Purchaser's obligation to pay such transferee for
such Shares or interest, and also to satisfy the Company's obligation to pay
Purchaser for such Shares or interest. Any sale or transfer of the Shares shall
be void unless the provisions of this Agreement are satisfied.

            (f) TERMINATION OF RIGHTS. The right of first refusal granted the
Company by Section 3(b) above and the option to repurchase the Shares in the
event of an involuntary transfer granted the Company by Section 3(c) above shall
terminate upon the first sale of Common Stock of the Company to the general
public pursuant to a registration statement filed with and declared effective by
the Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Securities Act").

      4. ESCROW OF UNVESTED SHARES. For purposes of facilitating the enforcement
of the provisions of Section 3 above, Purchaser agrees, immediately upon receipt
of the certificate(s) for the Shares subject to the Repurchase Option, to
deliver such certificate(s), together with an Assignment Separate from
Certificate in the form attached to this Agreement as Attachment A executed by
Purchaser and by Purchaser's spouse (if required for transfer), in blank, to the
Secretary of the Company, or the Secretary's designee, to hold such
certificate(s) and Assignment Separate from Certificate in escrow and to take
all such actions and to effectuate all such transfers and/or releases as are in
accordance with the terms of this Agreement. Purchaser hereby acknowledges that
the Secretary of the Company, or the Secretary's designee, is so appointed as
the escrow holder with the foregoing authorities as a material inducement to
make this Agreement and that said appointment is coupled with an interest and is
accordingly irrevocable. Purchaser agrees that said escrow holder shall not be
liable to any party hereof (or to any other party). The escrow holder may rely
upon any letter, notice or other document executed by any signature purported to
be genuine and may resign at any time. Purchaser agrees that if the Secretary of
the Company, or the Secretary's designee, resigns as escrow holder for any or no
reason, the Board of Directors of the Company shall have the power to appoint a
successor to serve as escrow holder pursuant to the terms of this Agreement.

      5. INVESTMENT AND TAXATION REPRESENTATIONS. In connection with the
purchase of the Shares, Purchaser represents to the Company the following:

            (a) Purchaser is aware of the Company's business affairs and
financial condition and has acquired sufficient information about the Company to
reach an informed and knowledgeable decision to acquire the Shares. Purchaser is
purchasing these securities for investment for his or her own account only and
not with a view to, or for resale in connection with, any "distribution" thereof
within the meaning of the Securities Act or under any applicable provision of
state law. Purchaser does not have any present intention to transfer the Shares
to any person or entity.

                                      -4-

            (b) Purchaser understands that the Shares have not been registered
under the Securities Act by reason of a specific exemption therefrom, which
exemption depends upon, among other things, the bona fide nature of Purchaser's
investment intent as expressed herein.

            (c) Purchaser further acknowledges and understands that the
securities must be held indefinitely unless they are subsequently registered
under the Securities Act or an exemption from such registration is available.
Purchaser further acknowledges and understands that the Company is under no
obligation to register the securities. Purchaser understands that the
certificate(s) evidencing the securities will be imprinted with a legend which
prohibits the transfer of the securities unless they are registered or such
registration is not required in the opinion of counsel for the Company.

            (d) Purchaser is familiar with the provisions of Rules 144 and 701,
each promulgated under the Securities Act, which, in substance, permit limited
public resale of "restricted securities" acquired, directly or indirectly, from
the issuer of the securities (or from an affiliate of such issuer), in a
non-public offering subject to the satisfaction of certain conditions. Purchaser
understands that the Company provides no assurances as to whether he or she will
be able to resell any or all of the Shares pursuant to Rule 144 or Rule 701,
which rules require, among other things, that the Company be subject to the
reporting requirements of the Securities Exchange Act of 1934, as amended, that
resales of securities take place only after the holder of the Shares has held
the Shares for certain specified time periods, and under certain circumstances,
that resales of securities be limited in volume and take place only pursuant to
brokered transactions. Notwithstanding this paragraph (d), Purchaser
acknowledges and agrees to the restrictions set forth in paragraph (e) below.

            (e) Purchaser further understands that in the event all of the
applicable requirements of Rule 144 or 701 are not satisfied, registration under
the Securities Act, compliance with Regulation A, or some other registration
exemption will be required; and that, notwithstanding the fact that Rules 144
and 701 are not exclusive, the Staff of the Securities and Exchange Commission
has expressed its opinion that persons proposing to sell private placement
securities other than in a registered offering and otherwise than pursuant to
Rule 144 or 701 will have a substantial burden of proof in establishing that an
exemption from registration is available for such offers or sales, and that such
persons and their respective brokers who participate in such transactions do so
at their own risk.

            (f) Purchaser understands that Purchaser may suffer adverse tax
consequences as a result of Purchaser's purchase or disposition of the Shares.
Purchaser represents that Purchaser has consulted any tax consultants Purchaser
deems advisable in connection with the purchase or disposition of the Shares and
that Purchaser is not relying on the Company for any tax advice.

      6. RESTRICTIVE LEGENDS AND STOP-TRANSFER ORDERS.

            (a) LEGENDS. The certificate or certificates representing the Shares
shall bear the following legends (as well as any legends required by applicable
state and federal corporate and securities laws):

               (i)   THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                     REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
                     (THE "ACT"), OR REGISTERED OR QUALIFIED UNDER THE
                     SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION, AND MAY
                     ONLY BE SOLD, PLEDGED, TRANSFERRED OR OTHERWISE DISPOSED OF
                     BY THE HOLDER IF SUBSEQUENTLY REGISTERED UNDER THE ACT AND
                     REGISTERED OR QUALIFIED UNDER ANY APPLICABLE STATE OR OTHER
                     SECURITIES LAWS,

                                      -5-

                     UNLESS THE COMPANY DETERMINES THAT EXEMPTION FROM SUCH
                     REGISTRATION REQUIREMENT IS AVAILABLE.

               (ii)  THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT
                     TO THE TERMS OF A STOCK PURCHASE AGREEMENT (THE
                     "AGREEMENT") BETWEEN THE COMPANY AND THE HOLDER OF SUCH
                     SECURITIES. PURSUANT TO THE TERMS OF SUCH AGREEMENT, THE
                     COMPANY HAS A RIGHT OF FIRST REFUSAL WITH RESPECT TO
                     TRANSFER OF SUCH SECURITIES AND HAS A RIGHT TO REPURCHASE
                     THE SECURITIES UNDER CERTAIN CIRCUMSTANCES. A COPY OF THE
                     AGREEMENT CAN BE OBTAINED UPON REQUEST BY THE HOLDER OF
                     THIS CERTIFICATE FROM THE SECRETARY OF THE COMPANY.

            (b) STOP-TRANSFER NOTICES. Purchaser agrees that, in order to ensure
compliance with the restrictions referred to herein, the Company may issue
appropriate "stop transfer" instructions to its transfer agent, if any, and
that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records.

            (c) REFUSAL TO TRANSFER. The Company shall not be required (i) to
transfer on its books any Shares that have been sold or otherwise transferred in
violation of any of the provisions of this Agreement or (ii) to treat as owner
of such Shares or to accord the right to vote or pay dividends to any purchaser
or other transferee to whom such Shares shall have been so transferred.

      7. NO EMPLOYMENT RIGHTS. Nothing in this Agreement shall affect in any
manner whatsoever the right or power of the Company, or a parent or subsidiary
of the Company, to terminate Purchaser's employment or consulting relationship,
for any reason, with or without cause.

      8. SECTION 83(b) ELECTION. Purchaser understands that Section 83(a) of the
Internal Revenue Code of 1986, as amended (the "Code"), taxes as ordinary income
for a Nonstatutory Stock Option and as alternative minimum taxable income for an
Incentive Stock Option the difference between the amount paid for the Shares and
the Fair Market Value of the Shares as of the date any restrictions on the
Shares lapse. In this context, "restriction" means the right of the Company to
buy back the Shares pursuant to the Repurchase Option set forth in Section 3(a)
of this Agreement. Purchaser understands that Purchaser may elect to be taxed at
the time the Shares are purchased, rather than when and as the Repurchase Option
expires, by filing an election under Section 83(b) (an "83(b) Election") of the
Code with the Internal Revenue Service within 30 days from the date of purchase.
Even if the Fair Market Value of the Shares at the time of the execution of this
Agreement equals the amount paid for the Shares, the election must be made to
avoid income and alternative minimum tax treatment under Section 83(a) in the
future. Purchaser understands that failure to file such an election in a timely
manner may result in adverse tax consequences for Purchaser. Purchaser further
understands that an additional copy of such election form should be filed with
his or her federal income tax return for the calendar year in which the date of
this Agreement falls. Purchaser acknowledges that the foregoing is only a
summary of the effect of United States federal income taxation with respect to
purchase of the Shares hereunder, and does not purport to be complete. Purchaser
further acknowledges that the Company has directed Purchaser to seek independent
advice regarding the applicable provisions of the Code, the income tax laws of
any municipality, state or foreign country in which Purchaser may reside, and
the tax consequences of Purchaser's death.



                                      -6-

      Purchaser agrees that he or she will execute and deliver to the Company
with this executed Agreement a copy of the Acknowledgment and Statement of
Decision Regarding Section 83(b) Election (the "Acknowledgment") attached hereto
as Attachment B. Purchaser further agrees that he or she will execute and submit
with the Acknowledgment a copy of the 83(b) Election attached hereto as
Attachment C (for tax purposes in connection with the early exercise of an
option) if Purchaser has indicated in the Acknowledgment his or her decision to
make such an election.

      9. LOCK-UP AGREEMENT. In connection with the initial public offering of
the Company's securities and upon request of the Company or the underwriters
managing any underwritten offering of the Company's securities, Purchaser agrees
not to sell, make any short sale of, loan, grant any option for the purchase of,
or otherwise dispose of any securities of the Company however or whenever
acquired (other than those included in the registration) without the prior
written consent of the Company or such underwriters, as the case may be, for
such period of time (not to exceed 180 days) from the effective date of such
registration as may be requested by the Company or such managing underwriters
and to execute an agreement reflecting the foregoing as may be requested by the
underwriters at the time of the public offering.

      10. MISCELLANEOUS.

            (a) GOVERNING LAW. This Agreement and all acts and transactions
pursuant hereto and the rights and obligations of the parties hereto shall be
governed, construed and interpreted in accordance with the laws of the State of
California, without giving effect to principles of conflicts of law.

            (b) ENTIRE AGREEMENT; ENFORCEMENT OF RIGHTS. This Agreement sets
forth the entire agreement and understanding of the parties relating to the
subject matter herein and merges all prior discussions between them. No
modification of or amendment to this Agreement, nor any waiver of any rights
under this Agreement, shall be effective unless in writing signed by the parties
to this Agreement. The failure by either party to enforce any rights under this
Agreement shall not be construed as a waiver of any rights of such party.

            (c) SEVERABILITY. If one or more provisions of this Agreement are
held to be unenforceable under applicable law, the parties agree to renegotiate
such provision in good faith. In the event that the parties cannot reach a
mutually agreeable and enforceable replacement for such provision, then (i) such
provision shall be excluded from this Agreement, (ii) the balance of the
Agreement shall be interpreted as if such provision were so excluded and (iii)
the balance of the Agreement shall be enforceable in accordance with its terms.

            (d) CONSTRUCTION. This Agreement is the result of negotiations
between and has been reviewed by each of the parties hereto and their respective
counsel, if any; accordingly, this Agreement shall be deemed to be the product
of all of the parties hereto, and no ambiguity shall be construed in favor of or
against any one of the parties hereto.

            (e) NOTICES. Any notice required or permitted by this Agreement
shall be in writing and shall be deemed sufficient when delivered personally or
sent by telegram or fax or 48 hours after being deposited in the U.S. mail, as
certified or registered mail, with postage prepaid, and addressed to the party
to be notified at such party's address as set forth below or as subsequently
modified by written notice.

            (f) COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original and all of which
together shall constitute one instrument.

                                      -7-

            (g) SUCCESSORS AND ASSIGNS. The rights and benefits of this
Agreement shall inure to the benefit of, and be enforceable by the Company's
successors and assigns. The rights and obligations of Purchaser under this
Agreement may only be assigned with the prior written consent of the Company.

            (h) CALIFORNIA CORPORATE SECURITIES LAW. THE SALE OF THE SECURITIES
WHICH ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF THE
SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR
PRIOR TO THE QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT
FROM QUALIFICATION BY SECTION 25100, 25102 OR 25105 OF THE CALIFORNIA
CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY
CONDITIONED UPON THE QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT.

                            [Signature Page Follows]



                                      -8-

The parties have executed this Early Exercise Notice and Restricted Stock
Purchase Agreement as of the date first set forth above.

                                    COMPANY:

                                    Berkana Wireless Inc.

                                    By:
                                        -----------------------------------

                                    Name:
                                          ---------------------------------

                                    Title:
                                          ---------------------------------


                                    PURCHASER:

                                    Name

                                    ---------------------------------------
                                    (Signature)

                                    ---------------------------------------
                                    (Print Name)

                                    Address:

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

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



I, ______________________, spouse of Name , have read and hereby approve the
foregoing Agreement. In consideration of the Company's granting my spouse the
right to purchase the Shares as set forth in the Agreement, I hereby agree to be
bound irrevocably by the Agreement and further agree that any community property
or other such interest that I may have in the Shares shall hereby be similarly
bound by the Agreement. I hereby appoint my spouse as my attorney-in-fact with
respect to any amendment or exercise of any rights under the Agreement.


                                    ------------------------------
                                    Spouse of Name



                                      -9-

                                  ATTACHMENT A

                      ASSIGNMENT SEPARATE FROM CERTIFICATE

            FOR VALUE RECEIVED and pursuant to that certain Early Exercise
Notice and Restricted Stock Purchase Agreement between the undersigned
("Purchaser") and Berkana Wireless Inc. (the "Company") dated _______________,
____ (the "Agreement"), Purchaser hereby sells, assigns and transfers unto the
Company _______________________ (________) shares of the Common Stock of the
Company, standing in Purchaser's name on the books of the Company and
represented by Certificate No. ____, and does hereby irrevocably constitute and
appoint ____________________________ to transfer said stock on the books of the
Company with full power of substitution in the premises. THIS ASSIGNMENT MAY
ONLY BE USED AS AUTHORIZED BY THE AGREEMENT AND THE ATTACHMENTS THERETO.

Dated: ______________________

                                    Signature:


                                    ---------------------------------------
                                    Name


                                    ---------------------------------------
                                    Spouse of Name (if applicable)



Instruction: Please do not fill in any blanks other than the signature line. The
purpose of this assignment is to enable the Company to exercise its Repurchase
Option set forth in the Agreement without requiring additional signatures on the
part of Purchaser.

                                  ATTACHMENT B

                    ACKNOWLEDGMENT AND STATEMENT OF DECISION
                        REGARDING SECTION 83(b) ELECTION

      The undersigned (which term includes the undersigned's spouse), a
purchaser of ___________ shares of Common Stock of Berkana Wireless Inc., a
Delaware corporation (the "Company") by exercise of an option (the "Option")
granted pursuant to the Company's 2002 Stock Plan (the "Plan"), hereby states as
follows:

      1. The undersigned acknowledges receipt of a copy of the Plan relating to
the offering of such shares. The undersigned has carefully reviewed the Plan and
the option agreement pursuant to which the Option was granted.

      2. The undersigned either [check and complete as applicable]:

      (a) ___ has consulted, and has been fully advised by, the undersigned's
              own tax advisor, ___________________________, whose business
              address is ____________________, regarding the federal, state and
              local tax consequences of purchasing shares under the Plan, and
              particularly regarding the advisability of making elections
              pursuant to Section 83(b) of the Internal Revenue Code of 1986, as
              amended (the "Code") and pursuant to the corresponding provisions,
              if any, of applicable state law; or

      (b) ___ has knowingly chosen not to consult such a tax advisor.

      3. The undersigned hereby states that the undersigned has decided [check
as applicable]:

      (a) ___ to make an election pursuant to Section 83(b) of the Code, and is
              submitting to the Company, together with the undersigned's
              executed Early Exercise Notice and Restricted Stock Purchase
              Agreement, an executed form entitled "Election Under Section 83(b)
              of the Internal Revenue Code of 1986;" or

      (b) ___ not to make an election pursuant to Section 83(b) of the Code.

      4. Neither the Company nor any subsidiary or representative of the Company
has made any warranty or representation to the undersigned with respect to the
tax consequences of the undersigned's purchase of shares under the Plan or of
the making or failure to make an election pursuant to Section 83(b) of the Code
or the corresponding provisions, if any, of applicable state law.

Date:
     -------------------                  ------------------------
                                          Name


Date:
     -------------------                  ------------------------
                                          Spouse of Name

                                  ATTACHMENT C

                          ELECTION UNDER SECTION 83(b)
                      OF THE INTERNAL REVENUE CODE OF 1986

      The undersigned taxpayer hereby elects, pursuant to Section 83(b) of the
Internal Revenue Code, to include in taxpayer's gross income or alternative
minimum taxable income, as applicable, for the current taxable year, the amount
of any income that may be taxable to taxpayer in connection with taxpayer's
receipt of the property described below:

1.    The name, address, taxpayer identification number and taxable year of the
      undersigned are as follows:

      NAME OF TAXPAYER:  Name

      ADDRESS:  _______________________

                _______________________

      IDENTIFICATION NO. OF TAXPAYER:  _______________

      TAXABLE YEAR:  200___

2.    The property with respect to which the election is made is described as
      follows:

      ______________ shares of the Common Stock of Berkana Wireless Inc., a
      Delaware corporation (the "Company").


3.    The date on which the property was transferred is:  ______________


4.    The property is subject to the following restrictions:

      Repurchase option at cost in favor of the Company upon termination of
      taxpayer's employment or consulting relationship.

5.    The fair market value at the time of transfer, determined without regard
      to any restriction other than a restriction which by its terms will never
      lapse, of such property is: $____________

6.    The amount (if any) paid for such property: $____________

The undersigned has submitted a copy of this statement to the person for whom
the services were performed in connection with the undersigned's receipt of the
above-described property. The transferee of such property is the person
performing the services in connection with the transfer of said property.

The undersigned understands that the foregoing election may not be revoked
except with the consent of the Commissioner.

                                    Dated: ____________           ______
                                                Name

                                    Dated: ____________           ______
                                                Spouse of Name

                               RECEIPT AND CONSENT

      The undersigned hereby acknowledges receipt of a photocopy of Certificate
No. ______ for ________ shares of Common Stock of Berkana Wireless Inc. (the
"Company").


      The undersigned further acknowledges that the Secretary of the Company, or
his or her designee, is acting as escrow holder pursuant to the Early Exercise
Notice and Restricted Stock Purchase Agreement Purchaser has previously entered
into with the Company. As escrow holder, the Secretary of the Company, or his or
her designee, holds the original of the aforementioned certificate issued in the
undersigned's name.

Dated:  _______________

                                      _____________________________________
                                      Name

                                    EXHIBIT B

                              BERKANA WIRELESS INC.

                                 2002 STOCK PLAN

             EXERCISE NOTICE AND RESTRICTED STOCK PURCHASE AGREEMENT

      This Agreement ("Agreement") is made as of____________, 200__ by and
between Berkana Wireless Inc., a Delaware corporation (the "Company"), and Name
("Purchaser"). To the extent any capitalized terms used in this Agreement are
not defined, they shall have the meaning ascribed to them in the 2002 Stock
Plan.

      1. EXERCISE OF OPTION. Subject to the terms and conditions hereof,
Purchaser hereby elects to exercise his or her option to purchase __________
shares of the Common Stock (the "Shares") of the Company under and pursuant to
the Company's 2002 Stock Plan (the "Plan") and the Stock Option Agreement dated
_______________, (the "Option Agreement"). The purchase price for the Shares
shall be $_______________ per Share for a total purchase price of $__________.
The term "Shares" refers to the purchased Shares and all securities received in
replacement of the Shares or as stock dividends or splits, all securities
received in replacement of the Shares in a recapitalization, merger,
reorganization, exchange or the like, and all new, substituted or additional
securities or other properties to which Purchaser is entitled by reason of
Purchaser's ownership of the Shares.

      2. TIME AND PLACE OF EXERCISE. The purchase and sale of the Shares under
this Agreement shall occur at the principal office of the Company simultaneously
with the execution and delivery of this Agreement in accordance with the
provisions of Section 3(b) of the Option Agreement. On such date, the Company
will deliver to Purchaser a certificate representing the Shares to be purchased
by Purchaser (which shall be issued in Purchaser's name) against payment of the
exercise price therefor by Purchaser by (a) check made payable to the Company,
(b) cancellation of indebtedness of the Company to Purchaser, (c) delivery of
shares of the Common Stock of the Company in accordance with Section 4 of the
Option Agreement, or (d) by a combination of the foregoing.

      3. LIMITATIONS ON TRANSFER. In addition to any other limitation on
transfer created by applicable securities laws, Purchaser shall not assign,
encumber or dispose of any interest in the Shares except in compliance with the
provisions below and applicable securities laws.

            (a) RIGHT OF FIRST REFUSAL. Before any Shares held by Purchaser or
any transferee of Purchaser (either being sometimes referred to herein as the
"Holder") may be sold or otherwise transferred (including transfer by gift or
operation of law), the Company or its assignee(s) shall have a right of first
refusal to purchase the Shares on the terms and conditions set forth in this
Section 3(a) (the "Right of First Refusal").

                  (i) NOTICE OF PROPOSED TRANSFER. The Holder of the Shares
shall deliver to the Company a written notice (the "Notice") stating: (i) the
Holder's bona fide intention to sell or otherwise transfer such Shares; (ii) the
name of each proposed purchaser or other transferee ("Proposed Transferee");
(iii) the number of Shares to be transferred to each Proposed Transferee; and
(iv) the terms and conditions of each proposed sale or transfer. The Holder
shall offer the Shares at the same price (the "Offered Price") and upon the same
terms (or terms as similar as reasonably possible) to the Company or its
assignee(s).

                  (ii) EXERCISE OF RIGHT OF FIRST REFUSAL. At any time within
thirty (30) days after receipt of the Notice, the Company and/or its assignee(s)
may, by giving written notice to the Holder, elect to purchase all, but not less
than all, of the Shares proposed to be transferred to any one or more of the
Proposed Transferees, at the purchase price determined in accordance with
subsection (iii) below.

                  (iii) PURCHASE PRICE. The purchase price ("Purchase Price")
for the Shares purchased by the Company or its assignee(s) under this Section
3(a) shall be the Offered Price. If the Offered Price includes consideration
other than cash, the cash equivalent value of the non-cash consideration shall
be determined by the Board of Directors of the Company in good faith.

                  (iv) PAYMENT. Payment of the Purchase Price shall be made, at
the option of the Company or its assignee(s), in cash (by check), by
cancellation of all or a portion of any outstanding indebtedness, or by any
combination thereof within 30 days after receipt of the Notice or in the manner
and at the times set forth in the Notice.

                  (v) HOLDER'S RIGHT TO TRANSFER. If all of the Shares proposed
in the Notice to be transferred to a given Proposed Transferee are not purchased
by the Company and/or its assignee(s) as provided in this Section 3(a), then the
Holder may sell or otherwise transfer such Shares to that Proposed Transferee at
the Offered Price or at a higher price, provided that such sale or other
transfer is consummated within 60 days after the date of the Notice and provided
further that any such sale or other transfer is effected in accordance with any
applicable securities laws and the Proposed Transferee agrees in writing that
the provisions of this Section 3 shall continue to apply to the Shares in the
hands of such Proposed Transferee. If the Shares described in the Notice are not
transferred to the Proposed Transferee within such period, or if the Holder
proposes to change the price or other terms to make them more favorable to the
Proposed Transferee, a new Notice shall be given to the Company, and the Company
and/or its assignees shall again be offered the Right of First Refusal before
any Shares held by the Holder may be sold or otherwise transferred.

                  (vi) EXCEPTION FOR CERTAIN FAMILY TRANSFERS. Anything to the
contrary contained in this Section 3(a) notwithstanding, the transfer of any or
all of the Shares during Purchaser's lifetime or on Purchaser's death by will or
intestacy to Purchaser's Immediate Family or a trust for the benefit of
Purchaser's Immediate Family shall be exempt from the provisions of this Section
3(a). "Immediate Family" as used herein shall mean spouse, lineal descendant or
antecedent, father, mother, brother or sister. In such case, the transferee or
other recipient shall receive and hold the Shares so transferred subject to the
provisions of this Section, and there shall be no further transfer of such
Shares except in accordance with the terms of this Section 3.

            (b) INVOLUNTARY TRANSFER.

                  (i) COMPANY'S RIGHT TO PURCHASE UPON INVOLUNTARY TRANSFER. In
the event, at any time after the date of this Agreement, of any transfer by
operation of law or other involuntary transfer (including death or divorce, but
excluding a transfer to Immediate Family as set forth in Section 3(a)(vi) above)
of all or a portion of the Shares by the record holder thereof, the Company
shall have an option to purchase all of the Shares transferred at the greater of
the purchase price paid by Purchaser pursuant to this Agreement or the fair
market value of the Shares on the date of transfer. Upon such a transfer, the
person acquiring the Shares shall promptly notify the Secretary of the Company
of such transfer. The right to purchase such Shares shall be provided to the
Company for a period of thirty (30) days following receipt by the Company of
written notice by the person acquiring the Shares.

                  (ii) PRICE FOR INVOLUNTARY TRANSFER. With respect to any stock
to be transferred pursuant to Section 3(b)(i), the price per Share shall be a
price set by the Board of

                                      -2-

Directors of the Company that will reflect the current value of the stock in
terms of present earnings and future prospects of the Company. The Company shall
notify Purchaser or his or her executor of the price so determined within thirty
(30) days after receipt by it of written notice of the transfer or proposed
transfer of Shares. However, if the Purchaser does not agree with the valuation
as determined by the Board of Directors of the Company, the Purchaser shall be
entitled to have the valuation determined by an independent appraiser to be
mutually agreed upon by the Company and the Purchaser and whose fees shall be
borne equally by the Company and the Purchaser.

            (c) ASSIGNMENT. The right of the Company to purchase any part of the
Shares may be assigned in whole or in part to any shareholder or shareholders of
the Company or other persons or organizations.

            (e) RESTRICTIONS BINDING ON TRANSFEREES. All transferees of Shares
or any interest therein will receive and hold such Shares or interest subject to
the provisions of this Agreement. Any sale or transfer of the Company's Shares
shall be void unless the provisions of this Agreement are satisfied.

            (f) TERMINATION OF RIGHTS. The right of first refusal granted the
Company by Section 3(a) above and the option to repurchase the Shares in the
event of an involuntary transfer granted the Company by Section 3(b) above shall
terminate upon the first sale of Common Stock of the Company to the general
public pursuant to a registration statement filed with and declared effective by
the Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Securities Act"). Upon termination of the right of first refusal
described in Section 3(b) above, a new certificate or certificates representing
the Shares not repurchased shall be issued, on request, without the legend
referred to in Section 6(a)(ii) herein and delivered to Purchaser.

      4. INVESTMENT AND TAXATION REPRESENTATIONS. In connection with the
purchase of the Shares, Purchaser represents to the Company the following:

            (a) Purchaser is aware of the Company's business affairs and
financial condition and has acquired sufficient information about the Company to
reach an informed and knowledgeable decision to acquire the Shares. Purchaser is
purchasing these securities for investment for his or her own account only and
not with a view to, or for resale in connection with, any "distribution" thereof
within the meaning of the Securities Act or under any applicable provision of
state law. Purchaser does not have any present intention to transfer the Shares
to any person or entity.

            (b) Purchaser understands that the Shares have not been registered
under the Securities Act by reason of a specific exemption therefrom, which
exemption depends upon, among other things, the bona fide nature of Purchaser's
investment intent as expressed herein.

            (c) Purchaser further acknowledges and understands that the
securities must be held indefinitely unless they are subsequently registered
under the Securities Act or an exemption from such registration is available.
Purchaser further acknowledges and understands that the Company is under no
obligation to register the securities. Purchaser understands that the
certificate(s) evidencing the securities will be imprinted with a legend which
prohibits the transfer of the securities unless they are registered or such
registration is not required in the opinion of counsel for the Company.

            (d) Purchaser is familiar with the provisions of Rules 144 and 701,
each promulgated under the Securities Act, which, in substance, permit limited
public resale of "restricted securities" acquired, directly or indirectly, from
the issuer of the securities (or from an affiliate of such issuer), in a
non-public offering subject to the satisfaction of certain conditions. Purchaser
understands that the Company provides no assurances as to whether he or she will
be able to resell

                                      -3-

any or all of the Shares pursuant to Rule 144 or Rule 701, which rules require,
among other things, that the Company be subject to the reporting requirements of
the Securities Exchange Act of 1934, as amended, that resales of securities take
place only after the holder of the Shares has held the Shares for certain
specified time periods, and under certain circumstances, that resales of
securities be limited in volume and take place only pursuant to brokered
transactions. Notwithstanding this paragraph (d), Purchaser acknowledges and
agrees to the restrictions set forth in paragraph (e) below.

            (e) Purchaser further understands that in the event all of the
applicable requirements of Rule 144 or 701 are not satisfied, registration under
the Securities Act, compliance with Regulation A, or some other registration
exemption will be required; and that, notwithstanding the fact that Rules 144
and 701 are not exclusive, the Staff of the Securities and Exchange Commission
has expressed its opinion that persons proposing to sell private placement
securities other than in a registered offering and otherwise than pursuant to
Rule 144 or 701 will have a substantial burden of proof in establishing that an
exemption from registration is available for such offers or sales, and that such
persons and their respective brokers who participate in such transactions do so
at their own risk.

            (f) Purchaser understands that Purchaser may suffer adverse tax
consequences as a result of Purchaser's purchase or disposition of the Shares.
Purchaser represents that Purchaser has consulted any tax consultants Purchaser
deems advisable in connection with the purchase or disposition of the Shares and
that Purchaser is not relying on the Company for any tax advice.

      5. RESTRICTIVE LEGENDS AND STOP-TRANSFER ORDERS.

            (a) LEGENDS. The certificate or certificates representing the Shares
shall bear the following legends (as well as any legends required by applicable
state and federal corporate and securities laws):

                  (i)   THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                        REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
                        (THE "ACT"), OR REGISTERED OR QUALIFIED UNDER THE
                        SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION, AND
                        MAY ONLY BE SOLD, PLEDGED, TRANSFERRED OR OTHERWISE
                        DISPOSED OF BY THE HOLDER IF SUBSEQUENTLY REGISTERED
                        UNDER THE ACT AND REGISTERED OR QUALIFIED UNDER ANY
                        APPLICABLE STATE OR OTHER SECURITIES LAWS, UNLESS THE
                        COMPANY DETERMINES THAT EXEMPTION FROM SUCH REGISTRATION
                        REQUIREMENT IS AVAILABLE.

                  (ii)  THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE
                        SUBJECT TO THE TERMS OF A STOCK PURCHASE AGREEMENT (THE
                        "AGREEMENT") BETWEEN THE COMPANY AND THE HOLDER OF SUCH
                        SECURITIES. PURSUANT TO THE TERMS OF SUCH AGREEMENT, THE
                        COMPANY HAS A RIGHT OF FIRST REFUSAL WITH RESPECT TO
                        TRANSFER OF SUCH SECURITIES AND HAS A RIGHT TO
                        REPURCHASE THE SECURITIES UNDER CERTAIN CIRCUMSTANCES. A
                        COPY OF THE AGREEMENT CAN BE OBTAINED UPON REQUEST BY
                        THE HOLDER OF THIS CERTIFICATE FROM THE SECRETARY OF THE
                        COMPANY.


                                      -4-

            (b) STOP-TRANSFER NOTICES. Purchaser agrees that, in order to ensure
compliance with the restrictions referred to herein, the Company may issue
appropriate "stop transfer" instructions to its transfer agent, if any, and
that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records.

            (c) REFUSAL TO TRANSFER. The Company shall not be required (i) to
transfer on its books any Shares that have been sold or otherwise transferred in
violation of any of the provisions of this Agreement or (ii) to treat as owner
of such Shares or to accord the right to vote or pay dividends to any purchaser
or other transferee to whom such Shares shall have been so transferred.

      6. NO EMPLOYMENT RIGHTS. Nothing in this Agreement shall affect in any
manner whatsoever the right or power of the Company, or a parent or subsidiary
of the Company, to terminate Purchaser's employment or consulting relationship,
for any reason, with or without cause.

      7. LOCK-UP AGREEMENT. In connection with the initial public offering of
the Company's securities and upon request of the Company or the underwriters
managing any underwritten offering of the Company's securities, Purchaser agrees
not to sell, make any short sale of, loan, grant any option for the purchase of,
or otherwise dispose of any securities of the Company however or whenever
acquired (other than those included in the registration) without the prior
written consent of the Company or such underwriters, as the case may be, for
such period of time (not to exceed 180 days) from the effective date of such
registration as may be requested by the Company or such managing underwriters
and to execute an agreement reflecting the foregoing as may be requested by the
underwriters at the time of the public offering.

      8. MISCELLANEOUS.

            (a) GOVERNING LAW. This Agreement and all acts and transactions
pursuant hereto and the rights and obligations of the parties hereto shall be
governed, construed and interpreted in accordance with the laws of the State of
California, without giving effect to principles of conflicts of law.

            (b) ENTIRE AGREEMENT; ENFORCEMENT OF RIGHTS. This Agreement sets
forth the entire agreement and understanding of the parties relating to the
subject matter herein and merges all prior discussions between them. No
modification of or amendment to this Agreement, nor any waiver of any rights
under this Agreement, shall be effective unless in writing signed by the parties
to this Agreement. The failure by either party to enforce any rights under this
Agreement shall not be construed as a waiver of any rights of such party.

            (c) SEVERABILITY. If one or more provisions of this Agreement are
held to be unenforceable under applicable law, the parties agree to renegotiate
such provision in good faith. In the event that the parties cannot reach a
mutually agreeable and enforceable replacement for such provision, then (i) such
provision shall be excluded from this Agreement, (ii) the balance of the
Agreement shall be interpreted as if such provision were so excluded and (iii)
the balance of the Agreement shall be enforceable in accordance with its terms.

            (d) CONSTRUCTION. This Agreement is the result of negotiations
between and has been reviewed by each of the parties hereto and their respective
counsel, if any; accordingly, this Agreement shall be deemed to be the product
of all of the parties hereto, and no ambiguity shall be construed in favor of or
against any one of the parties hereto.

                                      -5-

            (e) NOTICES. Any notice required or permitted by this Agreement
shall be in writing and shall be deemed sufficient when delivered personally or
sent by telegram or fax or forty-eight (48) hours after being deposited in the
U.S. mail, as certified or registered mail, with postage prepaid, and addressed
to the party to be notified at such party's address as set forth below or as
subsequently modified by written notice.

            (f) COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original and all of which
together shall constitute one instrument.

            (g) SUCCESSORS AND ASSIGNS. The rights and benefits of this
Agreement shall inure to the benefit of, and be enforceable by the Company's
successors and assigns. The rights and obligations of Purchaser under this
Agreement may only be assigned with the prior written consent of the Company.

            (h) California Corporate Securities Law. THE SALE OF THE SECURITIES
WHICH ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF THE
SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR
PRIOR TO THE QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT
FROM QUALIFICATION BY SECTION 25100, 25102 OR 25105 OF THE CALIFORNIA
CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY
CONDITIONED UPON THE QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT.


                            [Signature Page Follows]



                                      -6-

      The parties have executed this Exercise Notice and Restricted Stock
Purchase Agreement as of the date first set forth above.

                                    COMPANY:

                                    BERKANA WIRELESS INC.


                                    By:
                                       ------------------------------------
                                    Name:
                                         ----------------------------------
                                    Title:
                                          ---------------------------------


                                    PURCHASER:



                                    ---------------------------------------
                                    Name


                                    Address:

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

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


I, ______________________, spouse of Name, have read and hereby approve the
foregoing Agreement. In consideration of the Company's granting my spouse the
right to purchase the Shares as set forth in the Agreement, I hereby agree to be
irrevocably bound by the Agreement and further agree that any community property
or other such interest shall hereby by similarly bound by the Agreement. I
hereby appoint my spouse as my attorney-in-fact with respect to any amendment or
exercise of any rights under the Agreement.



                                          ------------------------------
                                          Spouse of Name



                                      -7-

                                     RECEIPT

      The undersigned hereby acknowledges receipt of Certificate No. _____ for
__________ shares of Common Stock of Berkana Wireless Inc.


Dated:  _______________

                                    _______________________________________
                                       Name

                               RECEIPT AND CONSENT

      The undersigned hereby acknowledges receipt of a photocopy Certificate No.
_____ purchaser for __________ shares of Common Stock of Berkana Wireless Inc.
(the "Company").


      The undersigned further acknowledges that the Secretary of the Company, or
his or her designee, holds the original of the aforementioned certificate issued
in the undersigned's name.

Dated:  _______________


                                    _______________________________________
                                    Name

                                     RECEIPT

      Berkana Wireless Inc. (the "Company") hereby acknowledges receipt of
(check as applicable):

      _____   A check in the amount of $__________

      _____   The cancellation of indebtedness in the amount of $__________

      _____   Certificate No. ____ representing ______ shares of the Company's
              Common Stock with a fair market value of $__________

given by Name as consideration for Certificate No. ______ for ___________ shares
of Common Stock of the Company.



Dated:  ______________

                                    BERKANA WIRELESS INC.


                                    By:
                                        -----------------------------------


                                    Name:
                                          ---------------------------------
                                          (print)

                                    Title:
                                           --------------------------------