<PAGE>

Note: Portions of this exhibit indicated by "[*]" are subject to a confidential
treatment request, and have been omitted from this exhibit. Complete, unredacted
copies of this exhibit have been filed with the Securities and Exchange
Commission as part of this Company's confidential treatment request.

                                                                   Exhibit 10.26
                                                                   -------------

                                SUPPLY AGREEMENT
                                ----------------


     This Supply Agreement (the "Agreement") is made effective as of the 27th
day of April, 2000 (the "Effective Date"), by and between

Airspan Communications Ltd, a company organised under the laws of England and
Wales, with its principal place of business at Cambridge House, Oxford Road,
Uxbridge Middlesex UB8 1UN  UK represented by: Joseph Caffarelli ("ACL")
and
Telbeskid Sp. z o.o. a company organised under the laws of Poland, with its
principal office at Nowy 0Ewiat Str.2, 33-300 Nowy S.cz, Poland and registered
under the entry H/B of the commercial register being kept and maintained by the
Municipal Court of Nowy S.cz, No...................... Represented by Lubomir
Gliniecki  ("Purchaser").


                                  WITNESSETH:

     WHEREAS, ACL is engaged in the design and manufacture of various
telecommunications product lines including, among others, those ACL products
more completely described in Exhibit A hereto (the ACL products described in
Exhibit A of this Agreement, as from time to time amended in accordance with the
provisions of this Agreement, are hereinafter called the "ACL Products"); and

     WHEREAS, Purchaser is engaged in the operation of telecommunications
systems; and

     WHEREAS, during the Term (as defined below) of this Agreement, ACL desires
to supply to Purchaser, and Purchaser wishes to acquire from ACL, the ACL
Products on the terms and conditions contained in this Agreement.

     NOW, THEREFORE, in consideration of the mutual promises herein contained,
it is hereby agreed as follows:

1.   SCOPE.
     -----

     1.1  This Agreement shall remain in effect for a period of 24 months from
the Effective Date (the "Term").

     1.2  During the Term, in accordance with each purchase order issued by
Purchaser and accepted by ACL, ACL shall:
<PAGE>

a.   Engineer, sell, and deliver that equipment so specified in the order
     ("Equipment" being defined as the hardware component of each product being
     offered under the terms and conditions of this Agreement);

b.   Grant to Purchaser a non-transferrable, non-exclusive, paid-up licence
     to use the Software (as defined in Section 10.1) during the useful life of
     the associated Equipment on the terms and conditions set forth in the
     Software Licence, Section 10; and

c.   Test and install the Equipment and/or Software (the "Installation
     Services") if Purchaser elects to purchase the Installation Services, and
     ACL accepts the obligation to perform such services, or if such services
     are included in the price of the Equipment or Software.

d.   The equipment shall undergo all regulatory approval procedures required by
     the relevant law and at the time of shipment will comply with the standards
     of the Polish market as stipulated in the following documents:

 .    Appendix No. 2 to the Regulation of September 4, 1997, by the Minister of
     Communications - General Technical Terms and Requirements for Customer
     Radio Access Systems in the Polish Public Communication Network

 .    Appendix No. 17 to the Regulation of July 16, 1993, by the Minister of
     Communications -Technical and Exploitation Requirements for Customer
     Transmission Data Systems for Phone Lines


e.   The equipment shall comply with the following regulations at the time of
     shipment:

 .    "Technical Requirements for Receivers of Customer Radio Access Systems" of
     TP S.A. (regulation No. 1 of the President of the TP S.A., of January 12,
     1998)

 .    "Methods and Terms of Analysis of Customer Radio Access Systems" of TP S.A.
     (regulation No. 1 of the President of the TP S.A., of January 12, 1998)


2.   ORDERING PROCEDURE.
     ------------------

     2.1  The following procedures shall be followed with respect to each
purchase order issued by Purchaser:
<PAGE>

     a. During the Term, Purchaser will inform ACL of its intent to purchase
     Equipment and Installation Services (but only if ACL expressly agrees to
     perform such Installation Services), and license Software, by sending to
     ACL a written order. This written order (the "Purchase Order") will state
     the type of Equipment, System, or Installation Services that Purchaser
     wants to purchase and the Software Purchaser wants to licence, the price of
     the ordered items (the "Contract Price") as set forth in Exhibit B, "Price
     List" (which is hereby incorporated by reference) and the proposed delivery
     and installation dates, if applicable.

     b.   Each Purchase Order shall specifically incorporate by reference the
          terms and conditions of this Agreement, and no additional or different
          terms and conditions stated in a Purchase Order, any letter, or
          otherwise shall be binding unless expressly referred and agreed to by
          ACL in writing. In the event of a conflict between the terms and
          conditionst of this Agreement and of any Purchase Order issued
          hereunder, or if the Purchase Order does not reference the terms and
          conditions of this Agreement, the terms and conditions of this
          Agreement shall control.

     c.   ACL and Purchaser agree that the equipment will be delivered according
          to the following schedule:


          June 15th, 2000 - Access Concentrator, Central terminals, Software and
          NMS, Documentation, installation tools and services (per Exhibit B),
          500 Subscriber Terminals.
          July 15th, 2000 - 400 Subscriber Terminals
          August 15th, 2000 - 500 Subscriber Terminals
          September 15th, 2000 - 600 Subscriber Terminals
          October 15th, 2000 - 700 Subscriber Terminals
          November 15th, 2000 - 1098 Subscriber Terminals


3.   CONTRACT PRICE.
     --------------

     3.1  The Contract Price for each item of Equipment, Installation Services,
or Software is as specified in Exhibit B and shall be paid to ACL in dollars of
the USA.  The Contract Price includes:

               a. The price of the Equipment;

               b. The fee for the licensing of the Software;

               c. If Installation Services are ordered and such order is
     accepted by ACL, the charges for installing and testing each unit of
     Equipment or Software;
<PAGE>

               d. The charges for the warranty of the Equipment and Software in
     accordance with Section 7; and

               e. Transportation charges in accordance with ACL's delivery
     obligations set forth in Section 5.1.

     3.2  The Contract Price, as listed in Exhibit B, shall not include value
added tax and any other applicable duties, taxes or imposts (including, but not
limited to, any export or import duties), all of which shall be for Purchaser's
account, but Purchaser shall not be required to pay any tax assessed on ACL's
income.

4.   PAYMENT TERMS.
     -------------

     4.1  If a Purchase Order is accepted by ACL, ACL will issue an invoice (the
"Invoice") to Purchaser within fifteen (15) business days of ACL's receipt of
the written Purchase Order from Purchaser.  The Invoice specifically shall
identify the Equipment, Software, or Systems so ordered, and the Contract Price
of such items.  Installation Services shall separately be invoiced within
fifteen (15) business days of ACL's receipt of a written Purchase Order for
same, and only if the order for Installation Services is expressly accepted by
ACL.  The Invoice also shall state the total due to ACL from Purchaser (the
"Invoice Total"), which shall include the Contract Price, and any applicable
taxes, duties, and other fees due pursuant to Section 3.2 of this Agreement.

     4.2 Payment for order in accordance to Exhibit B shall be as follows:.

     25% of the Total Contract value to be paid on or before May 15th. This
     amount will be deducted from amount due by last equipment delivery
     according to the contract.
     50% of the invoice sum for delivered equipment upon shipment
     50% of the invoice sum for delivered equipment 90 days after delivery
Payment will be deemed to have been made upon receipt of funds in ACL's bank in
the United Kingdom by wire (or telegraphic) transfer.


     4.4  In the case of payment by wire (or telegraphic) transfer, the funds
must be received in ACL's designated bank before shipments will be initiated.
The transfer instructions are:

     Bank:  Lloyds Bank
            32 Commercial Way
            Woking
            Surrey GU21 1ER
            UK

     Sort Code:     30-99-80

     Account Name:  ACL Communications Limited
<PAGE>

     Account No:  11232312

     Further Instructions:  "Reference (customer name) P.O. No. _______,
                            Payment of Invoice No. _________."

     4.5  If the cost to ACL of performing this Agreement increases as a result
of any change to the law or any reason beyond ACL's reasonable control, such
increase shall be added to the Contract Price.  ACL shall notify Purchaser of
its reasonable estimate which Purchaser shall be deemed to have accepted unless
it notifies ACL to the contrary within 14 calendar days.

5.   DELIVERY, TITLE, AND RISK OF LOSS.
     ---------------------------------

     5.1  All Equipment and Software will be delivered by ACL CIP Nowy S.cz,
          Poland (as defined in Incoterms), ACL's point of shipment. If
          requested by Purchaser, ACL may arrange for shipment to be made to
          Purchaser's identified warehouse facilities in Nowy S.cz or freight
          forwarder, subject to approval in writing by ACL in advance of
          shipment. Unless specified in Purchaser's order, ACL will select the
          mode of shipment and the carrier. ACL will be responsible for and pay
          all packing, shipping, freight, and insurance charges.

          In this Agreement, "Incoterms" means the most recent international
          rules for the interpretation of trade terms published by the
          International Chamber of Commerce as in force at the date when this
          Agreement is made.  Unless the context otherwise requires, any term or
          expression which is defined in or given a particular meaning by the
          provisions of the Incoterms shall have the same meaning in this
          Agreement, but if there is any conflict between the provisions of the
          Incoterms and this Agreement, the latter shall prevail.

     5.2  Title and all risk of loss or damage to the Equipment and Software
          will pass to Purchaser upon delivery by ACL to Purchaser.

     5.3  The Software shall at all times remain the exclusive property of ACL.

     5.4  Unless Purchaser clearly advises ACL to the contrary in writing, ACL
may make partial deliveries on account of Purchaser's orders. Delay in delivery
of any instalment shall not relieve Purchaser of its obligation to accept the
remaining deliveries.

     5.5  ACL will use reasonable efforts to meet Purchaser's requested delivery
schedules for Equipment and Software, but ACL reserves the right to refuse,
cancel, or delay delivery to Purchaser when Purchaser's credit is impaired, when
Purchaser is delinquent in payments or fails to meet other credit or financial
requirements reasonably established by ACL, or when
<PAGE>

Purchaser has failed to perform its obligations under this Agreement. Should
orders for Equipment and Software exceed ACL's available inventory, ACL will
allocate its available inventory and make deliveries on a basis that ACL deems
equitable, in its sole discretion, and without liability to Purchaser on account
of the method of allocation chosen or its implementation. In any event, ACL
shall not be liable for any direct, indirect, consequential, or special losses
or damages (including, but not limited to, loss of income or profit and loss of
data) that may be suffered by the Purchaser or by any other person for failure
to deliver or for any delay or error in delivery of Equipment or Software for
any reason whatsoever.

6.   SUBCONTRACTING.  ACL reserves the right to subcontract such portions of:
     --------------
(a) the Equipment manufacture and/or Software; and/or (b) installation to
subcontractors of ACL's choice as ACL deems appropriate.

7.   WARRANTY.
     --------

     7.1  THE WARRANTIES SET FORTH IN SECTIONS 7 AND 8 OF THIS AGREEMENT ARE IN
LIEU OF ALL OTHER WARRANTIES AND CONDITIONS, WHETHER EXPRESS OR IMPLIED,
INCLUDING THE IMPLIED TERMS OF SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR
PURPOSE.

     7.2  Subject to Sections 7.3 and 7.4, ACL warrants that the Equipment sold
to Purchaser under this Agreement shall, under normal use and service, be free
from defects in materials and faulty workmanship, and that the Software licensed
to Purchaser under this Agreement shall conform in all material respects to
ACL's published specifications therefor. If Installation Services are ordered,
the warranty period shall be eighteen (18) months from Delivery. (Hereinafter,
this period of time shall be referred to as the "Warranty Period.")

     7.3  ACL's obligation and Purchaser's sole remedy under this warranty are
limited to the replacement or repair, at ACL's option, of the defective
Equipment or Software within the Initial Warranty Period.  ACL shall have no
obligation to remedy any such defect if it can be shown that:  (a) the Equipment
or Software was altered, repaired, or reworked by any party other than ACL
without ACL's written consent; (b) such defects were the result of Purchaser's
improper storage, mishandling, abuse, or misuse of the Equipment or Software;
(c) such defects were the result of Purchaser's use of the Equipment or Software
in conjunction with equipment electronically or mechanically incompatible or of
an inferior quality; or (d) the defect was the result of damage by fire,
explosion, power failure, or any act of nature.

     7.4  In no event shall ACL be obliged to provide on-site maintenance.
Subject to the provisions of this warranty clause, defective parts or components
must be returned by Purchaser to ACL's point of manufacture facility, freight
prepaid, within the Initial Warranty Period, and said defective parts will be
repaired or replaced by ACL at no charge to Purchaser.  Risk of loss or damage
to Equipment or Software returned to ACL
<PAGE>

for repair or replacement shall be borne by Purchaser until delivery to ACL.
Upon delivery of such Equipment or Software, ACL shall assume the risk of loss
or damage until that time that the Equipment or Software being repaired or
replaced is returned and delivered to Purchaser. Purchaser will pay all
transportation costs for Equipment or Software shipped to ACL for repair or
replacement. ACL shall pay all transportation costs associated with returning
repaired or replaced Equipment or Software to Purchaser.

     7.5  ACL will charge Purchaser for any maintenance carried out which is not
covered by the warranties contained in Section 7.2 or Section 8 at ACL's then
prevailing standard rates for such services.

8.   WARRANTY ON REPAIRED MATERIALS.  ACL warrants that the Equipment or
     ------------------------------
Software returned to ACL for repair shall be free from defective materials and
faulty workmanship and that the Software will conform in all material respects
to ACL's published specifications therefor for one hundred and thirty five (135)
days from date of shipment from ACL to Purchaser or until the end of the Initial
Warranty Period, whichever is longer.

9.   LIMITATION OF LIABILITY.
     -----------------------

     9.1  WITHOUT PREJUDICE TO SECTION 9.4, IN NO EVENT SHALL ACL HAVE ANY
LIABILITY TO PURCHASER FOR LOSS OF PROFITS, INCOME OR DATA, INCIDENTAL,
CONSEQUENTIAL, OR INDIRECT DAMAGES OR LOSSES ARISING FROM THIS AGREEMENT OR ANY
COLLATERAL CONTRACT, WHETHER CAUSED BY NEGLIGENCE, BREACH OF CONTRACT OR
OTHERWISE, OR FOR LOSS, DAMAGE, OR EXPENSE INDIRECTLY ARISING FROM THE USE OF
THE EQUIPMENT OR THE SOFTWARE, OR THE INABILITY TO USE THEM EITHER SEPARATELY OR
IN COMBINATION WITH OTHER EQUIPMENT OR SOFTWARE, OR FROM ANY OTHER CAUSE.

     9.2  Without prejudice to Sections 9.3 and 9.4, ACL's liability for breach
of this Agreement shall in no circumstance exceed the Contract Price.

     9.3  ACL shall be liable for physical damage to Purchaser's property
resulting from its negligence up to a maximum of $1,000,000.

     9.4  Nothing in this Agreement shall exclude or in any way limit ACL
liability for death or personal injury caused by its negligence.

10.  SOFTWARE LICENCE.
     ----------------

     10.1 ACL shall grant Purchaser a nonexclusive, non-transferrable license to
use the Software, only with the Equipment purchased under this Agreement.
Software licensed under this Agreement is defined as computer programs contained
on a magnetic tape, disc, semiconductor device, or other memory, including:  (a)
hardwired logic instructions which manipulate data in the central processor and
which control input-output operations,
<PAGE>

error diagnostics, and recovery routine; and (b) instruction sequences in
machine-readable code which control call processing, peripheral equipment, and
administration and maintenance functions as well as associated documentation
used to describe, maintain, and use the programs.

     10.2 Any Software provided to Purchaser by ACL shall be treated as the
exclusive property of ACL, and Purchaser shall:  (1) treat such Software as
Confidential Information under Section 12 of this Agreement; (2) utilise such
Software or any portions or aspects thereof (including any methods or concepts
utilised therein) solely in conjunction with the Equipment; (3) return to ACL
all memory media, documentation and/or other material that has been modified,
updated or replaced; (4) not modify, disassemble or decompile such Software, or
reverse engineer any portion of the Software or functioning of the ACL Products,
or permit others to do so, without ACL's prior written consent; and (5) not
reproduce or copy such Software in whole or in part except for backup and
archival purposes or as otherwise permitted in writing by ACL.  Information to
achieve interoperability of the Software with independently created programs,
within the meaning of Article 6 of the Directive on the Legal Protection of
Computer Programs, is available from ACL on written request.

     10.3 The obligations of Purchaser under this Section 10 shall survive the
termination of this Agreement for any reason and shall continue even if the
Software is no longer utilised with the Equipment.

11.  DOCUMENTATION.  ACL shall furnish that documentation, if any, specified in
     -------------
Exhibit B to Purchaser to be used for the operation and ongoing maintenance of
the Equipment and Software.  All such documentation is to be treated in
accordance with the terms of Section 12.  Updates to the documentation shall be
at no charge during the Initial Warranty Period.

12.  CONFIDENTIAL INFORMATION.
     ------------------------

     12.1 All technical information, documentation, Software and other
proprietary information ("Confidential Information") supplied by ACL to
Purchaser under this Agreement, except for that which may be in the public
domain, shall, as between the parties hereto, be treated as the confidential and
proprietary information of ACL.  Purchaser, except as specifically authorised in
writing by ACL, shall:  (a) not disclose any Confidential Information received
from ACL to any person, except to its employees on a "need-to-know" basis; (b)
not reproduce any Confidential Information received from ACL, in whole or in
part; (c) use any Confidential Information received from ACL only for operation
and maintenance of the Equipment; and (d) indemnify ACL for any loss or damages
resulting from a breach of this Section 12.

     12.2 If this Agreement is terminated or cancelled, or if Purchaser is found
to have breached any of the provisions of Sections 10 or 12, Purchaser
<PAGE>

agrees to immediately return all technical information, documentation, and
Software to ACL. In any event, the obligations of Sections 10 and 12 will
survive termination or cancellation of this Agreement.

13.  EXCUSABLE DELAY.  ACL shall not suffer any liability for non-performance,
     ---------------
defective performance, or late performance under this Agreement due to causes
beyond its control and without its fault or negligence such as, but not limited
to, acts of God, war (including civil war), civil unrest, acts of government,
fire, floods, explosions, the elements, epidemics, quarantine, restrictions,
strikes, lock-outs, plant shutdown, material shortages, or delays in
transportation or delays of its suppliers or subcontractors for like cause.  In
the event of excusable delay as defined in the preceding sentence, then ACL,
upon giving prompt written notice to Purchaser, shall be excused from such
performance on a day-to-day basis to the extent of such prevention, restriction,
or interference (and Purchaser shall likewise be excused from performance of its
obligations on a day-to-day basis to the extent Purchaser's obligations relate
to the performance so prevented, restricted, or interfered with), provided that
ACL shall use its best endeavours to avoid or remove such causes of non-
performance and both parties shall proceed to perform with dispatch whenever
such causes are removed or cease to exist.  ACL reserves the right to cancel or
otherwise terminate this Agreement if Purchaser's performance is delayed for a
period of more than thirty (30) days.

14.  GENERAL INDEMNITY.
     -----------------

     14.1 ACL agrees to indemnify and hold Purchaser harmless against all costs,
expenses, liabilities, damages, losses, claims, or proceedings incurred by
Purchaser in an action by a third party alleging that Purchaser's use of the
Equipment or the Software, separately or in combination, as a whole or in part,
constitutes an infringement of their intellectual property rights wherever in
the world enforceable, including applications to register and rights to apply
for any such rights ("Intellectual Property Rights").  ACL agrees to defend
Purchaser against any such claims and to pay all litigation costs, reasonable
lawyer's fees, settlement payments, and any damages awarded or resulting from
any such claim.

14.2 Purchaser shall promptly advise ACL of any such suit, claim, or proceeding
and shall co-operate with ACL in the defence or settlement thereof.  ACL shall
have sole control of the defence of any action involving such a claim and of all
negotiations for its settlement.


     14.3 This indemnity shall not apply to claims arising in respect of the use
of the Equipment or Software supplied by ACL or manufactured by its suppliers in
accordance with any design or any special instruction furnished by Purchaser, or
which is used by Purchaser in a manner or for a purpose not contemplated by this
Agreement.
<PAGE>

     14.4 The provisions of this Section 14 set forth the entire obligation of
ACL with respect to any claim of infringement of Intellectual Property Rights.


15.  REMEDIES AND TERMINATION.
     ------------------------

     15.1 ACL shall have the right, prior to payment to ACL of the Invoice
Total, to suspend its performance under this Agreement by written notice to
Purchaser and forthwith remove and take possession of any Equipment and Software
which has been delivered if Purchaser shall:  (a) become insolvent; (b) have a
receiver or manager appointed over the whole or any part of its assets or
business; (c) make any composition or arrangement with its creditors; (d) take
or suffer any similar action in consequence of debt, or an order or resolution
is made for its dissolution or liquidation (other than for the purpose of
amalgamation or reconstruction); or (e) if Purchaser attempts to resell the
Equipment or Software without the consent of ACL.

     15.2 In the event of any material breach of this Agreement by either party
which shall continue for thirty (30) or more days after written notice of such
breach (including a reasonably detailed statement of the nature of such breach)
shall have been given to the breaching party by the aggrieved party, the
aggrieved party shall be entitled at its option:  (a) if the aggrieved party is
Purchaser, to suspend its performance under Section 4 of the Agreement for as
long as the breach continues uncorrected; or (b) if the aggrieved party is ACL,
to suspend performance of all of its obligations under the Agreement for as long
as the breach continues uncorrected; (c) to avail itself of any and all remedies
available at law or equity whether or not it elects to suspend its performance
under Section 15.2(a) or 15.2(b) as applicable; or (d) to terminate this
Agreement.

     15.3 In the event (a) either party fails timely to discharge its
obligations under this Agreement and (b) the aggrieved party employs a lawyer in
order to collect any amount due and unpaid or to enforce any right or remedy
hereunder, then the defaulting party agrees that, in addition to all amounts due
hereunder, it shall pay all costs of collection or enforcement including court
costs and reasonable Lawyer's fees.

16.  PURCHASER'S RESPONSIBILITIES.  To the extent that Purchaser requests
     ----------------------------
Installation Services, and ACL accepts the Purchase Order for such Installation
Services, then:

     a.   Purchaser shall ensure that all ACL-designated personnel have access
to Purchaser's premises and the Equipment during the times necessary to install,
maintain, and service the Equipment.  ACL's personnel shall comply with site and
security regulations as specified by Purchaser.

     b.   Purchaser shall provide reasonable working space and facilities
including heat, light, ventilation, electric current and outlets for use by
ACL's designated personnel.  Adequate storage space for equipment and
<PAGE>

materials shall be made available by Purchaser as required. All such facilities
shall be provided at no charge to ACL.

     c.   Any information which ACL reasonably requests from Purchaser and which
is required for ACL properly to install or maintain the Equipment shall be
provided by Purchaser in a timely fashion and form reasonably specified by ACL.

     d.   Purchaser shall not perform, or attempt to perform, or cause to be
performed any maintenance or repair to the Equipment during the term of this
Agreement, other than pursuant to this Agreement, without ACL's prior, written
consent.

17.  NOTICES.  All notices, requests, consents and other communications
     -------
hereunder must be in writing and will be deemed to have been properly given when
actually received by the party to whom sent, at the following addresses:


If to ACL:                              If to PURCHASER:
The Contract Manager
Airspan Communications Ltd              Telbeskid Sp. z o.o.
Cambridge House,                        Ul. Nowy . wiat 2
Oxford Road,                            33-300 Nowy S . cz
Uxbridge Middlesex                      Poland
UB8 1UN  UK



18.  HARDWARE AND SOFTWARE VERIFICATION
     ----------------------------------

     18.1  If Installation Services are ordered, ACL shall, upon completion of
the installation, test the Equipment.  Purchaser may witness the installation
and performance test.

     18.2  When the Equipment and Software have satisfactorily completed all of
ACL's tests, ACL shall provide Purchaser with a "Hardware and Software
Verification" certificate.  Provision of the certificate to Purchaser will be
deemed, for purposes of this Agreement, as "Completion of Installation".

19.  PUBLICITY.  ACL and Purchaser agrees not to publish any press releases or
     ---------
otherwise publicise the existence, or any of the terms, of this Agreement
without the prior written consent of the other party.

20.  MISCELLANEOUS.
     -------------
<PAGE>

     20.1 This Agreement shall be construed in accordance with and governed by
the laws of England and Wales, without regard to its conflicts of law rules.

     20.2 Any dispute, controversy or claim between the parties arising out of,
or in connection with, this Agreement, or the breach, termination or validity
thereof will be resolved by mutual agreement of the parties.  If any dispute,
controversy, or claim arising out of or relating to this Agreement, or the
breach, termination, or validity thereof is unable to be resolved by mutual
agreement of the parties, each of the parties hereby (i) agrees that any action,
suit, or proceeding with respect to this Agreement (other than an action for
injunctive or equitable relief within the Territory) against it or its
properties or revenues must be brought exclusively in the English courts sitting
in London, England, and (ii) irrevocably submits to the exclusive jurisdiction
of any such court and any appellate court from any order or judgement thereof in
any such action, suit, or proceeding.  Purchaser hereby irrevocably agrees that
all claims in respect of such action, suit, or proceeding may be heard and
determined in such courts.  Purchaser hereby irrevocably waives, to the fullest
extent it may effectively do so, the defence of an inconvenient forum to the
maintenance of such action, suit, or proceeding.  Purchaser agrees that a final
judgement in any such action, suit, or proceeding will be conclusive and may be
enforced in other jurisdictions by suit on the judgement or in any other manner
provided by law.

     20.3 ACL's delay or failure to enforce at any time any of the provisions of
this Agreement or any right with respect thereto, or to exercise any option
herein provided shall in no way be construed to be a waiver of such provision,
rights, or options, or in any way to affect its right later to enforce them.
ACL's exercise of any of its rights hereunder or of any options hereunder under
the terms or covenants herein shall not preclude or prejudice ACL from
thereafter exercising the same or any right which it may have under this
Agreement, irrespective of any previous action or proceeding taken by ACL
hereunder.

     20.4 This Agreement shall be binding upon and inure to the benefit of the
successors and assigns of ACL and shall be binding upon and inure to the benefit
of Purchaser's heirs, legal representatives, successors and permitted assigns.

     20.5 This Agreement and any Exhibit hereto shall be modified only by an
instrument in writing that is signed by duly-authorised representatives of the
parties.

     20.6 This Agreement is executed in Polish and English

     20.7 The provisions of this Agreement are severable, and if any provision
is held invalid or unenforceable in whole or in part in any jurisdiction, then
such invalidity or unenforceability will affect only such provision or part
thereof in such jurisdiction, and will not in any manner affect the provision in
<PAGE>

any other jurisdiction, or any other provision in this Agreement in any other
jurisdiction.  To the extent legally permissible, an arrangement that reflects
the original intent of the parties will be substituted for such invalid or
unenforceable provision.

     20.8  All obligations that by their nature survive the expiration,
cancellation or termination of this Agreement shall remain in effect after its
expiration, cancellation or termination.

     20.9  Purchaser shall not be entitled to assign this Agreement or its
rights under it without the prior written consent of ACL. ACL may assign the
Agreement or its rights under it without recourse to Purchaser.

     20.10  In the performance of its obligations under this Agreement,
Purchaser shall at all times strictly comply with all export laws, regulations,
and orders of the United Kingdom and the United States of America. Purchaser
specifically acknowledges that Equipment, Software or technology supplied or
licensed by ACL under this Agreement are subject to U.K. and U.S. trade
sanctions and export control laws and regulations including, but not limited to,
the various Foreign Assets Control Regulations, the Export Administration
Regulations, and the International Traffic in Arms Regulations. Purchaser
specifically acknowledges that Equipment, Software, or technology obtained from
ACL pursuant to this Agreement shall not be exported, reexported, transhipped,
disclosed, diverted, or transferred, directly or indirectly, contrary to U.K.
and U.S. laws, orders or regulations.

21.  This document constitutes the entire agreement between the parties with
respect to the subject matter hereof, and supersedes all previous
communications, representations, understandings and agreements, either oral or
written, between the parties or any official or representative thereof.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the Effective Date, such parties acting by their officers,
being thereunto duly authorised.



Airspan Communications Ltd                 Telbeskid Sp. z o.o.



\s\ Joseph J. Caffarelli.................  \s\ Lubomir Glinecki...
------------------------                   -----------------------
Joseph Cafarelli                           Lubomir Gliniecki
Senior Vice President &                    President of Board
Chief Financial Officer
<PAGE>

                                    EXHIBIT A
                                    ---------

                                 "ACL Products"

                                     AS 4000
                                     AS 8100
<PAGE>

                                   EXHIBIT B
                                   ---------

                                   Price List
                                   ----------

                    TELBESKID PROJECT 99128-APRIL 2000-04-27

                                  MASLANA GORA

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------
<S>                                                           <C>          <C>          <C>     <C>
Catalogue Number and Item description                           Basic        Total       Price     Extended Price
------------------------------------------------------------------------------------------------------------------
Subscriber Terminals
------------------------------------------------------------------------------------------------------------------
801-6112:  ST-R1 1-line 64k or 32k POTS 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (Ant, SIU, PSU.batt)
------------------------------------------------------------------------------------------------------------------
801-6122:  ST-R2 2-line 64k or 32k POTS 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
802-6112:  ST-S1 1-line 64k or 32k POTS 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
803-6142:  ST-N4 4-line 32k POTS 3.4-3.6 GHz Plan 1               *            *          $*             $*
(Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
804-6111:  St-B1 (ISDN 2B+D) 3.4-3.6 GHz Plan 1                   *            *          $*             $*
(Ant, SIU, PSU)
------------------------------------------------------------------------------------------------------------------
805-6112:  ST-L128 128kbit/s or 1x64kbit/s (DATA) 3.4-            *            *          $*             $*
3.6 GHz Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
Total Subscriber Terminals                                                                               $*
------------------------------------------------------------------------------------------------------------------
CT and AC Rack mechanics
------------------------------------------------------------------------------------------------------------------
700-0002:  CT Rack with RF Combiner shelf + 2 DA                  *            *          $*             $*
Modem shelves
------------------------------------------------------------------------------------------------------------------
700-0011:  CT Expansion Rack with 1 DA Modem shelf                *            *          $*             $*
------------------------------------------------------------------------------------------------------------------
700-0012:  CT Expansion Rack with 2 DA Modem shelves              *            *          $*             $*
------------------------------------------------------------------------------------------------------------------
Total CT and AC Rack mechanics                                                                           $*
------------------------------------------------------------------------------------------------------------------
CT Antenna Systems
------------------------------------------------------------------------------------------------------------------
710-6931:  Directional Antenna, 1 feeder port, 65 Deg             *            *          $*             $*
3.4-3.6 GHz
------------------------------------------------------------------------------------------------------------------
Total CT Antenn Systems                                                                                  $*
------------------------------------------------------------------------------------------------------------------
CT Antenna Feeder
------------------------------------------------------------------------------------------------------------------
712-0000:  CT Antenna Feeder (1x50m) + Installation kit           *            *          $*             $*
------------------------------------------------------------------------------------------------------------------
Total CT Antenna Feeder                                                                                  $*
------------------------------------------------------------------------------------------------------------------
CT FA and DA RF plug in sets
------------------------------------------------------------------------------------------------------------------
720-6100:  CT RF full plug in set 3.4-3.6 GHz Plan 1              *            *          $*             $*
(2PA+MON+3PSU+2DIPLNA)
------------------------------------------------------------------------------------------------------------------
Total CT FA and DA RF plug in sets                                                                       $*
------------------------------------------------------------------------------------------------------------------
CT DA Modem shelf card sets
------------------------------------------------------------------------------------------------------------------
750-6100:  DA Modem shelf full card set 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (RF+AU+TU+SC+2PSU+6 Modems)
------------------------------------------------------------------------------------------------------------------
Total CT DA Modem shelf card sets                                                                        $*
------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------
Total                                                                                                    $*
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</TABLE>
[*] Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.
<PAGE>

                                 KAMIENNA GORA

<TABLE>
<CAPTION>
Catalogue Number and Item description                           Basic        Total       Price     Extended Price
------------------------------------------------------------------------------------------------------------------
Subscriber Terminals
------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>         <C>          <C>           <C>
801-6112:  ST-R1 1-line 64k or 32k POTS 3.4-3.6 GHz               *            *           $*            $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
801-6122:  ST-R2 2-line 64k or 32k POTS 3.4-3.6 GHz               *            *           $*            $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
802-6112:  ST-S1 1-line 64k or 32k POTS 3.4-3.6 GHz               *            *           $*            $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
803-6142:  ST-N4 4-Line 32k POTS 3.4-3.6 GHz Plan 1               *            *           $*            $*
(Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
804-6111:  ST-B1 (ISDN 2B+D) 3.4-3.6 GHz Plan 1                   *            *           $*            $*
(Ant, SIU, PSU)
------------------------------------------------------------------------------------------------------------------
805-6112:  ST L-128 128kbit/s or 1x64kbit/s (DATA) 3.4-           *            *           $*            $*
3.6 GHz Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
Total Subscriber Terminals                                                                               $*
------------------------------------------------------------------------------------------------------------------
CT and AC Rack mechanics
------------------------------------------------------------------------------------------------------------------
700-0002:  CT Rack with RF Combiner shelf + 2DA Modem            *             *           $*            $*
 shelves
------------------------------------------------------------------------------------------------------------------
700-0012:  CT Expansion Rack with 2 DA Modem                     *             *           $*            $*
shelves
------------------------------------------------------------------------------------------------------------------
Total CT and AC Rack mechanics                                                                           $*
------------------------------------------------------------------------------------------------------------------
CT Antenna Systems
------------------------------------------------------------------------------------------------------------------
710-6931:  Directional Antenna, 1 feeder port, 65 Deg            *             *           $*           $*
3.4-3.6 GHz
------------------------------------------------------------------------------------------------------------------
Total CT Antenna Systems                                                                                $*
------------------------------------------------------------------------------------------------------------------
CT Antenna Feeder
------------------------------------------------------------------------------------------------------------------
712-0000:  CT Antenna Feeder (1x50m) + Installation kit          *             *           $*           $*
------------------------------------------------------------------------------------------------------------------
Total CT Antenna Feeder                                                                                 $*
------------------------------------------------------------------------------------------------------------------
CT FA and DA RF plug in sets
------------------------------------------------------------------------------------------------------------------
720-6100:  CT RF ful plug in set 3.4-3.6 GHz Plan 1              *             *           $*           $*
(2PA+MON+3PSU+2DIPLNA)
------------------------------------------------------------------------------------------------------------------
Total CT FA and DA RF plug in sets                                                                      $*
------------------------------------------------------------------------------------------------------------------
CT DA Modem shelf card sets
------------------------------------------------------------------------------------------------------------------
750-6100:  DA Modem shelf full card set 3.4-3.6 GHz              *             *           $*           $*
Plan 1 (RF+AU+TU+SC+2PSU+6 Modems)
------------------------------------------------------------------------------------------------------------------
Total CT DA Modem shelf card sets                                                                       $*
------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------

Total                                                                                                   $*
------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------
</TABLE>
[*] Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.
<PAGE>

                                  NOWY SACZ 2

<TABLE>
<CAPTION>
Catalogue Number and Item description                           Basic        Total       Price     Extended Price
------------------------------------------------------------------------------------------------------------------
Subscriber Terminals
------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>         <C>          <C>           <C>
801-6112:  ST-R1 1-line 64k or 32k POTS 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
801-6122:  ST-R2 2-line 64k or 32k POTS 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
802-6112:  ST-S1 1-line 64k or 32k POTS 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
803-6142:  ST-N4 4-Line 32k POTS 3.4-3.6 GHz Plan 1               *            *          $*             $*
(Ant, SIU, PSU, batt)
------------------------------------------------------------------------------------------------------------------
804-6111:  ST-B1 (ISDN 2B+D) 3.4-3.6 GHz Plan 1                   *            *          $*             $*
(Ant, SIU, PSU)
------------------------------------------------------------------------------------------------------------------
805-6111:  ST-L128 128kbit/s or 1x64kbit/s (DATA) 3.4-            *            *          $*             $*
3.6 GHz Plan 1 (Ant, SIU, PSU)
------------------------------------------------------------------------------------------------------------------
Total Subscriber Terminals                                                                               $*
------------------------------------------------------------------------------------------------------------------
CT and AC Rack mechanics
------------------------------------------------------------------------------------------------------------------
700-0002:  CT Rack with RF Combiner shelf + 2 DA                  *            *          $*             $*
Modem shelves
------------------------------------------------------------------------------------------------------------------
Total CT and AC Rack mechanics                                                                           $*
------------------------------------------------------------------------------------------------------------------
CT Antenna Systems
------------------------------------------------------------------------------------------------------------------
711-6902:  Dual feeder port Omni Antenna system 3.4-              *            *          $*             $*
3.6 GHz
------------------------------------------------------------------------------------------------------------------
Total CT Antenna Systems                                                                                  $*
------------------------------------------------------------------------------------------------------------------
CT Antenna Feeder
------------------------------------------------------------------------------------------------------------------
713-0000:  CT Antenna Feeder (2x50m) + Installation kit           *            *          $*             $*
------------------------------------------------------------------------------------------------------------------
Total CT Antenna Feeder                                                                                  $*
------------------------------------------------------------------------------------------------------------------
CT FA and DA RF plug in sets
------------------------------------------------------------------------------------------------------------------
720-6100:  CT RF full plug in set 3.4-3.6 GHz Plan 1              *            *          $*             $*
(2PA+MON+3PSU+2DIPLNA)
------------------------------------------------------------------------------------------------------------------
Total CT FA and DA RF plug in sets                                                                       $*
------------------------------------------------------------------------------------------------------------------
CT DA Modem shelf card sets
------------------------------------------------------------------------------------------------------------------
750-6100:  DA Modem shelf full card set 3.4-3.6 GHz               *            *          $*             $*
Plan 1 (RF+AU+TU+SC+2PSU+6 Modems)
------------------------------------------------------------------------------------------------------------------
Total CT DA Modem shelf card sets                                                                        $*
------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------

Total                                                                                                    $*
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</TABLE>

[*] Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.
<PAGE>

                KONCENTRATOR, OPROGRAMOWANIE, SZKOLENIE, USLUGI

<TABLE>
<CAPTION>
Catalogue Number and Item description                            Basic        Total       Price     Extended Price
-------------------------------------------------------------------------------------------------------------------
CT and AC Rack mechanics
-------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>         <C>          <C>           <C>
703-0001:  AC Rack with 1 AC shelf                                 *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
Total CT and AC Rack mechanics                                                                            $*
-------------------------------------------------------------------------------------------------------------------
AC Shelf plug-ins
-------------------------------------------------------------------------------------------------------------------
773-0000:  AC Shelf full card set for V5.2                         *            *          $*             $*
(2PSU+SC+2XTU+3CU+3CTU+spare CU+spare TU)
-------------------------------------------------------------------------------------------------------------------
Total AC Shelf plug-ins                                                                                   $*
-------------------------------------------------------------------------------------------------------------------
Software and NMS
-------------------------------------------------------------------------------------------------------------------
870-1000:  AS8100 Sitespan Desktop Hardware                        *            *          $*             $*
Platform (Windows NT PC + Serial port expansion.)
-------------------------------------------------------------------------------------------------------------------
870-2100:  AS8100 Sitespan Client/Server software                  *            *          $*             $*
and RTU license
-------------------------------------------------------------------------------------------------------------------
870-2300:  AS8100 Sitespan Shelf License                           *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
871-2000:  V5.2 License per 2000 subscribers                       *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
872-1000:  STMON for Windows 98 and NT                             *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
Total Software and NMS                                                                                    $*
-------------------------------------------------------------------------------------------------------------------
Documentation
-------------------------------------------------------------------------------------------------------------------
880-2000:  AS4000 DA Documentation (CD-ROM)                        *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
880-2001:  AS4000 DA Documentation (Paper)                         *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
880-3001:  AS8100 (Sitespan) Documentation (Paper)                 *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
Total Documentation                                                                                       $*
-------------------------------------------------------------------------------------------------------------------
Installation Tools
-------------------------------------------------------------------------------------------------------------------
882-0000:  Survey Tool (meter box, cables, PSU)                    *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
883-6102:  DA Survey Head Unit 3.4-3.6 GHz Plan 1                  *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
884-0000:  Pump-up mast for use with survey tool                   *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
Total Installation Tools                                                                                  $*
-------------------------------------------------------------------------------------------------------------------
Services
-------------------------------------------------------------------------------------------------------------------
885-1000:  Site Survey (per day, excl T&E)                         *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
885-2000:  Installation  (per day, excl T&E)                       *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
885-3000:  Radio Plannng (per day, excl T&E)                       *            *          $*             $*
-------------------------------------------------------------------------------------------------------------------
885-4000:  Airspan Training (per day at Uxbridge for up            *            *          $*             $*
to 6 students, excl T&E)
-------------------------------------------------------------------------------------------------------------------
885-4001:  Airspan Training (per day on Customer                   *            *          $*             $*
premises for up to 6 students, excl T&E)
-------------------------------------------------------------------------------------------------------------------
885-5000:  Project Management (per manager per day,                *            *          $*             $*
excl T&E)
-------------------------------------------------------------------------------------------------------------------
Total Services                                                                                            $*
-------------------------------------------------------------------------------------------------------------------
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Total                                                                                                     $*
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</TABLE>