Document:

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                                                                    Exhibit 10.5

                               DATED 5, JULY 1999

                       SIGMA WIRELESS TECHNOLOGIES LIMITED

                                     - and -

                        CENTURION INTERNATIONAL, LIMITED

                                     - and -

                          CENTURION INTERNATIONAL, INC

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

                              CONSULTANCY AGREEMENT

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

                               PINSENT  - CURTIS

                                3 Colmore Circus
                                   Birmingham
                                     B4 6BH
                                Tel: 01212001050
                                Fax: 0121626 1040
<PAGE>   2
THIS AGREEMENT is made on 5 July 1999

BETWEEN:

(1)      SIGMA WIRELESS TECHNOLOGIES LIMITED a company organised under the laws
         of Ireland of McKee Avenue, Finglas. Dublin 11, Ireland ("Consultant")
         and

(2)      CENTURION INTERNATIONAL, LIMITED (Company No: 3400714) a company
         registered in England whose registered office is situated at 2A, Alton
         Business Park, Gatehouse Way, Aylesbury, Buckinghamshire RP19 3XU
         ("Client")

(3)      CENTURION INTERNATIONAL, INC a company organised under the laws of
         Nebraska of 3425 North 44th Street, Lincoln, NE 68405 USA ("Guarantor")

WHEREAS:

(A)      The Consultant is a former manufacturer of moulded products for the
         hand-held wireless communication industry and has considerable skill
         and experience in the industry.

(B)      The parties have agreed that with effect from the Commencement Date the
         Consultant shall provide and the Client shall make use of certain
         consulting services described herein on the terms set out below.

IT IS AGREED as follows:

1.       TERM

         This Agreement shall commence on the date hereof ("Commencement Date")
         and shall continue in force until the second anniversary hereof and
         "Term" shall be construed accordingly.

         In the event that the Client terminates this Agreement prior to the
         expiry of the Term or commits a repudiatory breach (which shall include
         but not be limited to late payment of sums due and payable under the
         provisions of clause 5 herein) the sum of US$250,000, less any sums
         already paid up to the date of default or set off pursuant to clause 7
         below shall be immediately due and payable notwithstanding the fact
         that an appropriate invoice has not been raised in accordance with the
         provisions of clause 5.1 below.

2.       CONSULTANCY SERVICES

2.1      The Consultant shall during the Term provide services and procure that
         the services of Tony Boyle c/o Sigma Wireless Technologies Limited (and
         other employees, if necessary) will be made available to undertake the
         following consultancy services ("Services") to the Client:

                                      -2-
<PAGE>   3
                  "The provision of advice on and consultancy support for the
                  Client's moulded antennae business generally and specifically
                  its customer relationship with Motorola";

         on dates to be agreed between the parties (if any) but not more than 12
         days in any period of twelve months from the Commencement Date.

2.2      The Consultant and its agents and employees shall in the performance of
         the Services have and use reasonable care, skill and expertise.

2.3      The Client shall permit the Consultant reasonable access to its
         premises at all times upon reasonable prior notice in order for the
         Consultant to collect any items, assets or materials belonging to it
         after the date of this Agreement.

3.       LEGAL RELATIONSHIP

         The Consultant and its agents and employees shall provide the Services
         as independent contractors and not as employees, agents, partners or
         officers of the Client.

4.       CONFIDENTIALITY

4.1      In this Agreement "Confidential Information" means any information
         which is divulged to the Consultant or which comes to its knowledge in
         the course of or for the purposes of this Agreement and which is
         described by the Client in writing as such or the party divulging it as
         being of a confidential nature and/or which by reason of its nature or
         the circumstances or manner in which it comes to the Consultant's
         knowledge is apparently of such a nature but information shall not be
         or shall cease to be Confidential Information if and to the extent that
         it comes to be in the public domain other than as a result of the act
         or default of the Consultant or its agents or employees.

4.2      At no time during or after the Term shall the Consultant make use of
         Confidential Information for its own benefit or for that of any party
         other than the Client or disclose Confidential Information to any other
         person, firm or company other than with the authority of the Client.

4.3      Immediately upon the termination of this Agreement the Consultant shall
         deliver up to the Client all books, documents, correspondence,
         drawings, data, specifications, readable or computer or other machine
         readable data, flow charts, coding sheets, test data, test routines,
         diagnostic programs, software programs or other property belonging to
         the Client and the Consultant shall not retain copies thereof.

5.       CONSULTANCY FEES AND EXPENSES

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5.1      The Client shall pay to the Consultant fees ("Consultancy Fees") of US$
         125,000 (exclusive of VAT) per annum whether or not Consultancy
         Services are requested of the Consultant which shall be payable
         quarterly in arrears upon presentation to the Client of an invoice for
         the Consultancy Fees earned and any expenses incurred during the
         relevant quarter.

5.2      On receipt of an invoice for Consultancy Fees the Client shall pay the
         invoice together with any and all applicable VAT thereon within 10
         days.

5.3      The Consultant shall not be entitled to any remuneration or other
         benefit in respect of the Consultancy Services other than the
         Consultancy Fees.

5.4      Subject to the Client's reasonable requirements with respect to
         reporting and documentation of expenses, the Client shall repay hotel
         travelling and out-of-pocket expenses incurred by the Consultant in
         providing the Consultancy Services including travelling to and from the
         premises of the Client or other place of assignment and in the case of
         the use of any private motor car for business purposes the Client shall
         reimburse the Consultant at the mileage rate allowed by the Client for
         the time being but except as provided above the Consultant shall not be
         entitled to be paid any expenses.

5.5      Interest at the rate of 3% per annum above the Lloyds TSB base rate
         shall accrue on all sums due under this Agreement which are not paid to
         the Consultant in accordance with the terms of this Agreement.

6.       SET-OFF

         Any amounts owed to Consultant by Client pursuant to this Agreement for
         the Consultant's provision of Services will be available to satisfy any
         claims for indemnification asserted by Client against Consultant
         pursuant to Section 8.2 of the Asset and Share Purchase Agreement ("the
         Purchase Agreement") dated as of 5 July 1999 to which the Client and
         the Consultant are parties. Upon receipt of the invoice referenced in
         clause 5.1 above, Client shall be obliged to pay Consultant only the
         amount reflected on such invoice; minus:

6.1      any amounts subtracted by virtue of Client's claims for indemnification
         under Section 8.2 of the Purchase Agreement; and

6.2      an amount equal to the sum of all unresolved claims, suits, actions or
         causes of action (and costs thereof) pending, alleged or instituted
         against Buyer or Target as of the date a particular payment under this
         Agreement is due and arising from the Excluded Liabilities (as such
         terms in this sub-clause are defined in the Purchase Agreement);

         provided that any and all sums so withheld shall be paid immediately
         with interest thereon calculated in accordance with the provisions of
         clause 5.5 above to the Consultant upon agreement or final
         determination in favour of the Consultant.

                                       -4-
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7.       DEFAULT

         The sum of US$250,000 less any sum already paid under this Agreement
         and any funds set off pursuant to clause 7 above shall be forthwith
         repayable on the happening of any of the following events:

7.1      a petition being presented (and not withdrawn, stayed, discharged or
         set aside within 21 days of such presentation) or an effective
         resolution being passed or an order being made for the winding-up of
         the Client or in each case any similar or equivalent procedure in any
         jurisdiction other than England and Wales;

7.2      the appointment of an administrator or of an administrative receiver
         over any part of the undertaking assets or property of the Client or
         the levying of any distress or executions upon any of the assets or
         property of the Client which is not paid out within seven days of its
         being levied or in each case any similar or equivalent procedure in any
         jurisdiction other than England and Wales;

7.3      The Client becoming insolvent or unable to pay its debts (as defined in
         Section 123 Insolvency Act 1986) stops payment of its indebtedness or
         makes a general assignment for the benefit of, or composition with, its
         creditors or a moratorium is agreed or declared in respect of, or
         affecting, its indebtedness;

7.4      the Client ceasing or threatening to cease to carry on its business.

8.       NOTICES

8.1      Any notice given under this Agreement shall be in writing and shall be
         served on the Client at its registered office or on the Consultant at
         its registered office.

8.2      Any notice shall be taken to have been received on the date and time of
         its actual receipt except that if correctly addressed and stamped and
         sent by first class prepaid letter post it shall be taken to have been
         received on the third day after posting of it.

9.       GUARANTEE

9.1      In consideration of the entry of the Consultant into this Agreement the
         Guarantor hereby unconditionally and irrevocably guarantees to the
         Consultant on the terms of this clause 9 observance by the Client of
         its obligations under or pursuant to this Agreement and agrees to
         indemnify the consultancy against all reasonable losses, liabilities,
         costs, charges, expenses, actions, proceedings, claims and demands
         which the Consultant may suffer through or arising from any breach by
         the Client of such obligations.

                                       -5-
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9.2      If and whenever the Client defaults for any reason whatsoever in the
         performance of any obligation or liability undertaken or expressed to
         be undertaken by the Client under or pursuant to this Agreement, the
         Guarantor shall upon demand perform (or procure performance of) and
         satisfy (or procure the satisfaction of) the obligation or liability in
         regard to which such default has been made in the manner prescribed by
         this Agreement and so that the same benefits shall be conferred on the
         Consultant as it would have received if such obligation or liability
         had been duly performed and satisfied by the Client.

9.3      This guarantee is to be a continuing guarantee and is in addition to
         and without prejudice to and not in substitution for any other rights
         or security which the Consultant may now or hereafter have or hold for
         the performance and observance of the obligations of the Client under
         or in connection with this Agreement.

9.4      As a separate and independent stipulation the Guarantor agrees that any
         obligation expressed to be undertaken by the Client (including, without
         limitation, any moneys expressed to be payable under this Agreement)
         which may not be enforceable against or recoverable from the Client by
         reason of any legal limitation, disability or incapacity on or of the
         Client or any other fact or circumstance (other than any material
         breach by the Client of this Agreement or any limitation imposed by
         this Agreement) shall nevertheless be enforceable against and
         recoverable from the Guarantor as though the same had been incurred by
         the Guarantor and the Guarantor was the sole or principal obligor in
         respect thereof and shall be performed or paid by the Guarantor on
         demand.

10.      ARBITRATION

10.1     Except as otherwise expressly provided herein, all claims or
         controversies between the parties (or their permitted assignees)
         arising out of or relating to this Agreement shall be finally
         determined by arbitration in accordance with the rules in effect from
         time to time of the Chartered Institute of Arbitrators in Ireland by
         one arbitrator (selected in default of agreement between the parties by
         the President for the time being of the Law Society of Ireland) who is
         knowledgeable concerning the law governing the dispute (which for the
         avoidance of doubt shall be the laws of England) and such arbitration
         shall constitute an arbitration for the purposes of the Arbitration Act
         1954-1980.

10.2     The arbitration shall take place in Dublin, Ireland and the language of
         the arbitration shall be English.

10.3     The arbitrator shall be empowered to permit reasonable discovery and
         shall have the authority to award all forms of relief determined to be
         just and equitable. Any arbitral award rendered pursuant to this Clause
         10 shall be final and binding on the Consultant, the Client and the
         Guarantor and may be enforced in any Court of competent jurisdiction.
         For this and any other purpose, each of the Consultant, the Client and
         the Guarantor (i) waives any bond, surety or other security that might
         be required of any other party in respect thereto, and (ii)

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         agrees that any part may make service on the other party by sending or
         delivering a copy of the proceeds to such party at the address and in
         the manner provided for the giving of notices in Section 11 below or in
         any other manner permitted by law.

10.4     All instances of arbitration, the costs of arbitration shall be borne
         by the unsuccessful party, except in the event that determination of
         success is not clear cut, in which case the cost of arbitration shall
         be allocated by the Arbitrator, having regard to the nature of the
         dispute, the contentions of the parties and his or her decision on the
         merits of the dispute.

11.      NOTICES

         All notices, demands and other communications given or delivered under
         this Agreement will be in writing and will be deemed to have been given
         when personally delivered, mailed by first class mail, return receipt
         requested, or delivered by express courier service or telecopied.
         Notices, demands and communications to the Client, the Consultant and
         the Guarantor will, unless another address is specified in writing, be
         sent to the address indicated below:

                  Notices to Consultant

                  Sigma Wireless Technologies Limited
                  McKee Avenue
                  Finglas, Dublin 11
                  Ireland
                  Attention:  Peter Crowley

                  with a copy to:

                  Pinsent Curtis
                  3 Colmore Circus
                  Birmingham, B4 6BH
                  Attention:  Barry Doherty

                  Notices to Client and Guarantor

                  Centurion International, Limited
                  2A Alton Business Park
                  Gatehouse Way
                  Aylesbury
                  Buckinghamshire, HP19 3XU
                  Attention:  Gary Kuck

                  with a copy to:

                                       -7-
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                  Centurion International, Inc
                  3425 North 44th Street
                  Lincoln, NE 68504 USA
                  Attention:  Gary Kuck

                  with a copy to:

                  Kirkland & Willis International
                  International Financial Centre
                  Old Broad Street
                  London, EC2N 1HQ
                  Attention: Aaron Edward Alt

         Any party may send any notice, request, demand, claim, or other
         communication hereunder to the intended recipient at the address set
         forth above using any other means (including personal delivery,
         expedited courier, messenger service, telecopy, ordinary mail, or
         electronic mail) but no such notice, request, demand, claim, or other
         communication shall be deemed to have been duly given unless and until
         it actually is received by the intended recipient. Any Party may change
         the address to which notices, requests, demands, claims and other
         communications hereunder are to be delivered by giving the other
         Parties notice in the manner herein set forth.

                                       -8-
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SIGNED by A BOYLE                       ) /s/ A Boyle
for and on behalf of SIGMA WIRELESS     )
TECHNOLOGIES LIMITED                    )
in the presence of:                     ) /s/ Peter Crowley

Signature of Witness:

Name of Witness:

Address:

SIGNED by GARY KUCK                     ) /s/ Gary L. Kuck
for and on behalf of CENTURION          )
INTERNATIONAL, LIMITED                  )
in the presence of:                     ) /s/ V. Stoiljkoic

Signature of Witness: /s/ Dennis J. Hellbusch

Name of Witness: /s/ Dennis J. Hellbusch

Address: 2140 S. 35th
         Lincoln, NE 68506
         USA

SIGNED by GARY KUCK                     ) /s/ Gary L. Kuck
for and on behalf of CENTURION          )
INTERNATIONAL, INC                      )
in the presence of:                     ) /s/ V. Stoiljkoic

Signature of Witness: /s/ Dennis J. Hellbusch

Name of Witness: /s/ Dennis J. Hellbusch

Address: 2140 S. 35th St.
         Lincoln, NE 68506
         USA

                                       -9-<PAGE>   1
                                                                    Exhibit 10.6

                             SUBSCRIPTION AGREEMENT

            SUBSCRIPTION AGREEMENT (this "Agreement"), dated as of June 2,
1999, by and among CENTURION INTERNATIONAL, INC., a Nebraska corporation (the
"Company"), CORNERSTONE EQUITY INVESTORS IV, L.P., a Delaware limited
partnership ("Cornerstone"), PRUDENTIAL PRIVATE EQUITY INVESTORS III, L.P., a
Delaware limited partnership ("PPEI"), KUCK INVESTMENT PARTNERS, L.P., a
Delaware limited partnership ("Kuck"), and James Anthony Boyle ("Boyle"),
Michael McGinley ("McGinley"), and Peter Crowley ("Crowley" and, together with
Boyle and McGinley, the "Investors").

            WHEREAS, the Company and the Investors desire to enter into an
agreement that will provide for the acquisition by (i) Boyle of (A) 11,847
shares of the Company's Common Stock and (B) 1,500 shares of the Company's
Series B Preferred, (ii) McGinley of 3,949 shares of Common Stock and 500 shares
of Series B Preferred, and (iii) Crowley of 3,949 shares of Common Stock and 500
shares of Series B Preferred, in each case upon the terms and conditions set
forth herein.

            WHEREAS, the execution and delivery of this Subscription Agreement
by each of the Company and the Investors is a condition to the obligations of
the parties to that certain Asset and Share Purchase Agreement, dated as of June
2, 1999, by and among Centurion International, Ltd., a company organized under
the laws of England and Wales, and Sigma Wireless Technologies Ltd., a company
organized under the laws of Ireland (the "Asset and Share Purchase Agreement").

            NOW, THEREFORE, in consideration of the mutual undertakings
contained herein, the parties hereto agree as follows:

            1. Definitions. As used herein, the following terms shall have the
following meanings.

            "Affiliate" shall mean, as to any Person, any other Person which
directly or indirectly controls, or is under common control with, or is
controlled by, such Person. As used in this definition, "control" (including,
with its correlative meanings, "controlled by" and "under common control with")
shall mean possession, directly or indirectly, of power to direct or cause the
direction of management or policies (whether through ownership of securities or
partnership or other ownership interests, by contract or otherwise).

            "Approved Sale" means the sale of the Company, in a single
transaction or a series of related transactions, to a third party (which is not
an Affiliate of the Approving Stockholders) (a) pursuant to which such third
party proposes to acquire all or substantially all of the outstanding Common
Stock (whether by merger, consolidation, recapitalization, reorganization,
purchase of the outstanding Common Stock or otherwise) or all or substantially
all of the consolidated assets of the Company, (b) which has been approved by
the Board, holders of a majority of the outstanding Cornerstone Stockholder
Shares and holders of a majority of the outstanding PPEI Stockholder Shares,
voting together as a single class (the "Approving Stockholders"), (c) pursuant
to which all holders of Common Stock receive with respect thereto (whether in
such transaction or, with respect
<PAGE>   2
to an asset sale, upon a subsequent liquidation) the same form and amount of
consideration per share of Common Stock or, if any holders are given an option
as to the form and amount of consideration to be received, all holders are given
the same option, and (d) in connection with such transaction, no fee is being
paid by the Company to Cornerstone or any of its Affiliates.

            "Board" means the Company's board of directors.

            "Business Day" means any day that is not a Saturday, Sunday or other
day on which banks are required or authorized by law to be closed in the State
of New York or City of New York.

            "Common Stock" means the Company's Common Stock, par value $0.01 per
share.

            "Company Shares" means all issued and outstanding shares of capital
stock of the Company and all rights to acquire capital stock of the Company and
all stock appreciation, phantom stock, profit, participation and similar rights
with respect to the Company's capital stock of whatever nature.

            "Cornerstone Stockholder Shares" means all Stockholder Shares issued
or issuable to Cornerstone and its Affiliates or otherwise acquired by such
Persons.

            "Family Group" means, with respect to an individual holder of
Investor Stock, such Person's spouse and descendants (whether natural or
adopted) and any trust solely for the benefit of, or any partnership, the only
partners of which are, such Person and/or such Person's spouse, their respective
ancestors and/or descendants (whether natural or adopted).

            "GAAP" means U.S. generally accepted accounting principles, as in
effect from time to time and as adopted by the Company with the consent of its
independent public accountants, consistently applied.

            "Governmental Entity" means individually, and "Government Entities"
means collectively, the United States of America or any other nation, any state
or other political subdivision thereof, or any entity exercising executive,
legislative, judicial, regulatory or administrative functions of government,
including any Tribunal, in each case having jurisdiction over the Company or any
of its Subsidiaries.

            "Initial Public Offering" means the initial underwritten public
offering of the Company's Common Stock pursuant to a registration statement
filed under the Securities Act with the Securities and Exchange Commission,
which offering results in gross proceeds (before deducting underwriting
discounts and expenses) to the Company and any selling Stockholder of at least
$40,000,000.

            "Investor Stock" means all Company Shares acquired by the Investors
hereunder and all Company Shares hereafter acquired by the Investors. Investor
Stock will continue to be Investor Stock in the hands of any holder other than
the Investors, including all transferees of the Investors (except for the
Company and Cornerstone), and except as otherwise provided herein, each such
other holder of Investor Stock will succeed to all rights and obligations
attributable to the Investors as a

                                       -2-
<PAGE>   3
holder of Investor Stock hereunder. Investor Stock will also include shares of
the Company's capital stock issued with respect to Investor Stock by way of a
stock split, stock dividend or other recapitalization.

            "Other Stockholders" means, with respect to a Stockholder, all
Stockholders other than such Stockholder.

            "Person" means an individual, a partnership, a corporation, an
association, a joint stock company, a limited liability company, a trust, a
joint venture, an unincorporated organization or a governmental entity or any
department, agency or political subdivision thereof.

            "Prime Rate" means, for any day, a fluctuating rate of interest per
annum equal to the sum of (x) the prime rate of interest announced by Citibank
N.A. from time to time, changing when and as said prime rate changes, plus (y)
2.0% per annum.

            "PPEI Stockholder Shares " means all Stockholder Shares issued or
issuable to PPEI and its Affiliates or otherwise acquired by such Persons.

            "Public Sale" means any sale of Stockholder Shares to the public
pursuant to an offering registered under the Securities Act or to the public
effected through a broker, dealer or market maker pursuant to the provisions of
Rule 144 under the Securities Act.

            "Put Price" means, with respect to each share of Common Stock, the
Common Stock Share Price.

            "Recapitalization Agreement" means the Recapitalization Agreement,
dated as of April 18, 1997 by and among the Company, Cornerstone, PPEI, Kuck,
Lance J. Kuck, Scott M. Kuck and P. Jackson Bell.

            "SEC" means the Securities and Exchange Commission.

            "Securities Act" means the Securities Act of 1933, as amended from
time to time.

            "Series A Preferred Stock" means the Company's Series A Convertible
Preferred Stock, par value $0.01 per share.

            "Series B Preferred" means the Company's Series B Redeemable
Preferred Stock, par value $0.01 per share.

            "Stock Option Plan" means the Centurion International, Inc. 1997
Stock Option Plan as in effect from time to time.

            "Stockholder" means any party to the Stockholders Agreement or this
Agreement, the Permitted Transferees of any such party, and any other Person who
becomes a party to the Stockholders Agreement or this Agreement.

                                     -3-
<PAGE>   4
            "Stockholder Shares" means (i) any Common Stock held by the
Stockholders, including without limitation any Common Stock issued upon
conversion of the Series A Preferred Stock, and (ii) any equity securities
issued or issuable directly or indirectly with respect to the securities
referred to in clause (i) above by way of stock dividend or stock split or in
connection with a combination of shares, recapitalization, merger, consolidation
or other reorganization. As to any particular shares constituting Stockholder
Shares, such shares will cease to be Stockholder Shares when they have been sold
in a Public Sale, an Approved Sale, or upon the consummation of an Initial
Public Offering. For purposes of this Agreement, a Person will be deemed to be a
holder of Stockholder Shares whenever such Person has the right to acquire
directly or indirectly such Stockholder Shares (upon conversion or exercise in
connection with a Transfer of securities or otherwise, but disregarding any
restrictions or limitations upon the exercise of such right), whether or not
such acquisition has actually been effected.

            "Stockholders Agreement" means the Stockholders Agreement, dated as
of April 18, 1997, by and among the Company, Cornerstone, PPEI, Kuck, and
certain other Persons signatory thereto.

            "Subsidiary" means, with respect to any Person, any corporation,
partnership, association or other business entity of which (i) if a corporation,
a majority of the total voting power of shares of stock entitled (without regard
to the occurrence of any contingency) to vote in the election of directors,
managers or trustees thereof is at the time owned or controlled, directly or
indirectly, by that Person or one or more of the other Subsidiaries of that
Person or a combination thereof, or (ii) if a partnership, association or other
business entity, a majority of the partnership or other similar ownership
interest thereof is at the time owned or controlled, directly or indirectly, by
any Person or one or more Subsidiaries of that Person or a combination thereof.
For purposes hereof, a Person or Persons shall be deemed to have a majority
ownership interest in a partnership, association or other business entity if
such Person or Persons shall be allocated a majority of partnership, association
or other business entity gains or losses or shall be or control the managing
director or a general partner of such partnership, association or other business
entity.

            "Tribunal" means any government, arbitration panel, court or
governmental department, commission, board, bureau, agency or instrumentality of
the United States of America or any state, province, commonwealth, nation,
territory, possession, county, parish, town, township, village, municipality or
other Governmental Entity, whether now or hereafter constituted and/or existing.

            2. Purchase and Sale of Investor Stock.

            (a) The closing of the transactions contemplated by this Agreement
(the "Closing") shall take place upon satisfaction or waiver of all conditions
to the obligations of the parties hereto to consummate the transactions
contemplated hereby or such other date as the parties hereto may mutually
determine (the "Closing Date"). On the Closing Date, (i) each of Boyle,
McGinley, and Crowley will purchase, and the Company will sell (A) 11,847,
3,949, and 3,949 shares of Common Stock, respectively, at a price of $88.63 per
share (the "Common Stock Share Price") and (B) 1,500 and 500 shares of Series B
Preferred, respectively, at a price of $100 per share, and (ii) the Company will
deliver to each Investor certificates representing such shares, and

                                       -4-
<PAGE>   5
each of Boyle, McGinley, and Crowley will deliver to the Company a check or wire
transfer of immediately available funds in the aggregate amount of
$1,199,999.61, $399,999.87, and $399,999.87, respectively (each, the "Investor
Purchase Price")

            (b) In connection with the purchase and sale of the Investor Stock
hereunder, each Investor represents and warrants to the Company that:

                  (i) The Investor Stock to be issued to such Investor pursuant
to this Agreement will be acquired for such Investor's own account and not with
a view to, or intention of, distribution thereof in violation of the Securities
Act, or any applicable state securities laws, and such Investor's Investor Stock
will not be disposed of in contravention of the Securities Act or any applicable
state securities laws.

                  (ii) Such Investor has not retained a finder, broker,
financial advisor or other intermediary who is to be paid a commission, fee or
other remuneration for soliciting such Investor to purchase the Investor Stock.

                  (iii) Such Investor is sophisticated in financial matters and
is able to evaluate the risks and benefits of the investment in the Investor
Stock and has determined that such investment in the Investor Stock is suitable
for such Investor, based upon such Investor's financial situation and needs, as
well as such Investor's other securities holdings.

                  (iv) Such Investor:

                        (A) has not filed a registration statement which is the
subject of a currently effective registration stop order entered pursuant to any
state's securities laws within the last five years;

                        (B) has not been convicted within the last five years of
any felony or misdemeanor in connection with the offer, purchase or sale of any
security or any felony involving fraud or deceit, including, but not limited to,
forgery, embezzlement, obtaining money under false pretenses, larceny or
conspiracy to defraud;

                        (C) is not currently subject to any state administrative
enforcement order or judgment entered by the state securities administrator
within the last five years or subject to any state's administrative enforcement
order or judgment in which fraud or deceit, including, but not limited to,
making untrue statements of material facts and omitting to state material facts,
was found and the order or judgment was entered within the last five years;

                        (D) is not subject to any state's administrative
enforcement order or judgment which prohibits, denies or revokes the use of any
exemption from registration in connection with the offer, purchase or sale of
securities; or

                        (E) is not currently subject to any order, judgment or
decree of any court of competent jurisdiction, entered within the last five
years, temporarily or preliminarily restraining or enjoining such party from
engaging in or continuing any conduct or practice in

                                       -5-
<PAGE>   6
connection with the purchase or sale of any security or involving the making of
any false filing with the state.

                  (v) Such Investor is able to bear the economic risk of such
Investor's investment in the Investor Stock for an indefinite period of time and
the Investor understands that the Investor Stock has not been registered under
the Securities Act and cannot be sold unless subsequently registered under the
Securities Act or unless an exemption from such registration is available.

                  (vi) Such Investor has had an opportunity to ask questions and
receive answers concerning the terms and conditions of the offering of Investor
Stock.

                  (vii) Such Agreement constitutes the legal, valid and binding
obligation of such Investor, enforceable in accordance with its terms, and the
execution, delivery and performance of this Agreement by such Investor does not
and will not conflict with, violate or cause a breach of any agreement, contract
or instrument to which such Investor is a party or any judgment, order or decree
to which the Investor is subject.

            (c) In connection with the purchase and sale of the Investor Stock
hereunder, the Company represents and warrants to each Investor that:

                  (i) Corporate Organization and Power. The Company is a
corporation duly organized, validly existing and in good standing under the laws
of its jurisdiction of incorporation with full corporate power and authority to
enter into this Agreement and any other agreements contemplated hereby and
perform its obligations hereunder and thereunder. The Company and each of its
Subsidiaries has the requisite power and authority to own all of the properties
owned by it and to conduct its business as now being conducted.

                  (ii) Authorization. The execution, delivery and performance of
this Agreement and any other agreements contemplated hereby by the Company and
the consummation of the transactions contemplated hereby and thereby have been
duly and validly authorized by all requisite corporate action on the part of the
Company, and no other corporate proceedings on its part are necessary to
authorize the execution, delivery or performance of this Agreement or any other
agreements contemplated hereby. This Agreement and any other agreements
contemplated hereby constitute valid and binding obligations of the Company,
enforceable in accordance with their terms.

                  (iii) No Violation. The Company is not subject to or obligated
under its articles of incorporation, any applicable law, or rule or regulation
of any governmental authority, or any agreement or instrument, or any license,
franchise or permit, or subject to any order, writ, injunction or decree, which
would be breached or violated by its execution, delivery or performance of this
Agreement or the other agreements contemplated hereby.

                  (iv) Financial Statements. The audited consolidated balance
sheets and statements of income, changes in stockholders' equity, and cash flow
of the Company and its Subsidiaries as of and for the fiscal years ended
December 31, 1996, December 31, 1997 and December 31, 1998 (including the notes
thereto), and the unaudited consolidated balance sheet and

                                       -6-
<PAGE>   7
statement of income, changes in stockholders' equity and cash flow of the
Company and its Subsidiaries as of and for the three month period ended March
31, 1999, copies of which have been delivered by the Company to the Investors,
have been prepared in accordance with GAAP applied on a consistent basis
throughout the periods covered thereby and present fairly the financial
condition of the Company as of such dates and the results of operations and cash
flows of the Company for such periods.

                  (v) Capitalization. Immediately following the consummation of
the transactions contemplated hereby, the authorized capital stock of the
Company shall consist of (i) 1,063,830 shares of Common Stock, of which 819,745
shares shall be issued and outstanding, (ii) 160,000 shares of Series A
Preferred, of which 160,000 shares shall be issued and outstanding, and (iii)
90,000 shares of Series B Preferred, of which 87,500 shares shall be issued and
outstanding. As of immediately following the consummation of the transactions
contemplated hereby, all of the outstanding shares of the Company's capital
stock shall be validly issued, fully paid and nonassessable. After giving effect
to the consummation of the transactions contemplated by this Agreement, the only
shares of capital stock of the Company issued and outstanding, reserved for
issuance or committed to be issued will be:

                        (A) 819,745 outstanding shares of Common Stock;

                        (B) 160,000 shares of Series A Preferred, which shares
are convertible into 160,000 shares of Common Stock;

                        (C) 87,500 outstanding shares of Series B Preferred;

                        (D) 160,000 shares of Common Stock reserved for issuance
upon the conversion of the Series A Preferred; and

                        (E) 63,830 shares of Common Stock reserved for issuance
under the Company's stock option plans, pursuant to which options to purchase
41,250 shares of Common Stock are outstanding.

Except as set forth above, there are no outstanding rights, options, warrants or
other agreements binding upon the Company for the issuance of any shares of its
capital stock. The Company has no stock appreciation rights, phantom stock plan
or similar rights outstanding.

                  (vi) Investor Stock. The Investor Stock has been duly and
validly authorized and upon issuance thereof pursuant to the terms of this
Agreement will be duly and validly issued, fully paid and non-assessable.

            (d) In connection with the purchase and sale of the Investor Stock
hereunder, each of Cornerstone, PPEI and Kuck represents and warrants to each
Investor that:

                  (i) Authorization. The execution, delivery and performance of
this Agreement and any other agreements contemplated hereby by such Person and
the consummation of the transactions contemplated hereby and thereby have been
duly and validly authorized by all

                                       -7-
<PAGE>   8
requisite corporate, limited partnership or other action on the part of such
Person, and no other proceedings on its part are necessary to authorize the
execution, delivery or performance of this Agreement or any other agreements
contemplated hereby. This Agreement and any other agreements contemplated hereby
constitute valid and binding obligations of such Person, enforceable in
accordance with their terms.

                  (ii) No Violation. Such Person is not subject to or obligated
under its articles of incorporation or other organizational documents (if any),
any applicable law, or rule or regulation of any governmental authority, or any
agreement or instrument, or any license, franchise or permit, or subject to any
order, writ, injunction or decree, which would be breached or violated by its
execution, delivery or performance of this Agreement or the other agreements
contemplated hereby.

            (e) The obligation of the Company to consummate the transactions to
be performed by it hereunder is subject to satisfaction of the following
condition: the representations and warranties of the Investors set forth in
Section 2(b) above shall be true and correct in all material respects at and as
of the Closing Date.

            (f) The obligation of each Investor to consummate the transactions
to be performed by it hereunder is subject to satisfaction of the following
conditions: the representations and warranties of (i) the Company set forth in
Section 2(c) above shall be true and correct in all material respects (except
the representations and warranties of the Company set forth in Section 2(c)(v)
above, which shall be true and correct in all respects) at and as of the Closing
Date and (ii) each of Cornerstone, PPEI and Kuck set forth in Section 2(d) above
shall be true and correct in all material respects at and as of the Closing
Date.

            (g) The obligations of the parties hereto to consummate the
transactions contemplated under the terms and conditions of this Agreement are
subject to satisfaction of the following condition: the simultaneous closing of
(i) the transactions contemplated under the terms and conditions of the Asset
Purchase Agreement (the "Asset Purchase Closing") and (ii) the Closing. Each
Investor acknowledges that (x) such Investor shall pay the Investor Purchase
Price to the Company prior to or simultaneously with the Asset Purchase Closing
and (y) the failure of the Asset Purchase Closing and the Closing to occur
simultaneously shall relieve the Company of any obligations it may have under
the terms and conditions of the Asset Purchase Agreement.

            3. Restrictions on Transfer of Investor Stock.

            (a) Tag Along Rights. Subject to Section 3(d), at least 15 days
prior to any sale, transfer, assignment, pledge or other disposal (a "Transfer")
of any Company Shares by a Stockholder (other than any Investor) making such a
Transfer (the "Transferring Stockholder"), the Transferring Stockholder shall
deliver a written notice (the "Sale Notice") to the Company and the Other
Stockholders, specifying in reasonable detail the identity of the prospective
transferee(s) and the terms and conditions of the Transfer. The Other
Stockholders may elect to participate in the contemplated Transfer by delivering
written notice to the Transferring Stockholder within 10 days after delivery of
the Sale Notice. If any Other Stockholders have elected to participate in such
Transfer, each of the Transferring Stockholder and such Other Stockholders shall
be entitled to sell

                                       -8-
<PAGE>   9
in the contemplated Transfer, at the same price and on the same terms, a number
of Company Shares of any series or class equal to the product of (i) the
quotient determined by dividing the percentage of Company Shares of such series
or class owned by such holder of Stockholder Shares by the aggregate percentage
of Company Shares of such series or class owned by the Transferring Stockholder
and the Other Stockholders participating in such Transfer and (ii) the aggregate
number of Company Shares of such series or class to be sold in the contemplated
Transfer.

            (b) First Offer Rights. Subject to Sections 3(c) and 3(d), at least
20 days prior to any Transfer of shares of Investor Stock by any Investor or any
of his Permitted Transferees (other than a Transfer pursuant to Section 3(a)),
such Person making such Transfer (the "Offering Stockholder") shall deliver a
written notice (the "Transfer Notice") to the Company, Kuck, PPEI and
Cornerstone specifying in reasonable detail the number of shares proposed to be
Transferred, the proposed purchase price (which shall be payable solely in cash)
and the other terms and conditions of the Transfer. The Company may elect to
purchase all (but not less than all) of the shares of Investor Stock to be
Transferred, upon the same terms and conditions as those set forth in the
Transfer Notice, by delivering a written notice of such election to the Offering
Stockholder within 10 days after the Transfer Notice has been delivered to the
Company. If the Company has not elected to purchase all of the shares of
Investor Stock to be Transferred, Cornerstone, PPEI and Kuck may elect to
purchase all (but not less than all) of the shares of Investor Stock to be
Transferred on a pro rata basis (the determination of which shall be consistent
with the methodology set forth in Section 3(a) above) upon the same terms and
conditions as those set forth in the Transfer Notice, by giving written notice
of such election to the Offering Stockholder within 20 days after the Transfer
Notice has been given to Cornerstone, PPEI and Kuck (the "Option Period"). If
neither the Company nor Cornerstone nor PPEI nor Kuck elects to purchase all of
the shares of Investor Stock specified in the Transfer Notice, then the Offering
Stockholder may Transfer the shares of Investor Stock specified in the Transfer
Notice at a price and on terms no more favorable to the transferee(s) thereof
than specified in the Transfer Notice during the 60-day period immediately
following the expiration of the Option Period. Any shares of Investor Stock not
Transferred within such 60-day period will be subject to the provisions of this
Section 3(b) upon subsequent Transfer.

            (c) Permitted Transfers. The restrictions contained in Section 3(b)
shall not apply with respect to any Transfer of shares of Investor Stock by any
Investor to any other Investor or pursuant to applicable laws of descent and
distribution or to any member of such Investor's Family Group; provided, that
the restrictions contained in this Section 3 shall continue to be applicable to
such shares of Investor Stock after any such Transfer; and provided further,
that the transferees of such shares of Investor Stock pursuant to this Section
3(c) shall have agreed in writing to be bound by the provisions of this
Agreement which affect the shares of Investor Stock so Transferred by executing
a joinder in the form substantially attached hereto as Exhibit A. All
transferees permitted under this Section 3(c) are collectively referred to
herein as "Permitted Transferees."

            (d) Termination of Restrictions. The rights and restrictions set
forth in this Section 3 shall continue with respect to each share of Investor
Stock until the earlier of (i) the Transfer of such share of Investor Stock in a
Public Sale or an Approved Sale, or (ii) the consummation of an Initial Public
Offering.

                                       -9-
<PAGE>   10
            (e) The foregoing restrictions on Transfer shall not apply in the
event of an Approved Sale consummated pursuant to Section 4 below.

                  4. Sale of the Company.

            (a) In the event that an Approved Sale is proposed (a "Proposed
Sale"):

                  (i) The Company shall provide a written notice (the "Approved
Sale Notice") of such Proposed Sale to each holder of Investor Stock not later
than the twentieth (20th) Business Day prior to the consummation of the Proposed
Sale. The Approved Sale Notice shall contain written notice of the Proposed
Sale, setting forth the consideration per share to be paid by the third party or
parties (the "Approved Sale Share Price") and the other material terms and
conditions of the Proposed Sale. Subject to Section 4(e), within fifteen (15)
Business Days following the date the Approved Sale Notice is given, each holder
of Investor Stock shall deliver to the Company (A) the certificate or
certificates or other documents evidencing all Investor Stock owned or held by
such Person duly endorsed in blank or accompanied by written instruments of
Transfer in form satisfactory to the Company, executed by such Person, and (B) a
special irrevocable power-of-attorney authorizing the Company, on behalf of such
Person, to sell or otherwise dispose of such Investor Stock pursuant to this
Section 4 and to take all such actions as shall be necessary or appropriate on
behalf of all of the Stockholders in order to consummate such sale or
disposition in accordance with the terms and conditions contained in the
Approved Sale Notice.

                  (ii) Within two (2) Business Days after the consummation of
the Approved Sale, the Company shall remit to each holder of Investor Stock the
aggregate sales price of the Investor Stock of such Person sold pursuant thereto
(less a pro rata portion of the out-of-pocket expenses (including, without
limitation, reasonable legal expenses) incurred by the Company in connection
with such sale).

                  (iii) If, at the end of the one hundred and twenty (120) day
period following the giving of the Approved Sale Notice, the Company shall not
have completed the Proposed Sale, the Company shall return to each holder of
Investor Stock all certificates or other documents evidencing the Investor Stock
that such Person delivered for sale pursuant to this Section 4 and such Person's
related power-of-attorney.

                  (iv) Except as expressly provided in this Section 4, the
Company shall have no obligation to any holder of Investor Stock with respect to
the sale of any Investor Stock owned by such Person in connection with this
Section 4. Anything herein to the contrary notwithstanding, neither the Company
nor the holders of Cornerstone Stockholder Shares shall have any obligation to
any holder of Investor Stock to sell or otherwise dispose of the Investor Stock
of any Person pursuant to this Section 4 or as a result of any decision by the
Company or the holders of Cornerstone Stockholder Shares, as applicable, not to
accept or consummate any Proposed Sale of the Company or securities of the
Company (it being understood that any and all such decisions shall be made by
the Company or the holders of Cornerstone Stockholder Shares, as applicable, in
such Person's sole discretion). No holder of Investor Stock shall be entitled to
make any sale of Investor Stock directly to any third party pursuant to an
Approved Sale (it being understood that all such sales shall be made only on the
terms and pursuant to the procedures set forth in this Section 4).

                                      -10-
<PAGE>   11
            (b) In the event of an Approved Sale, each holder of Investor Stock
will (i) consent to and raise no objections against the Approved Sale or the
process pursuant to which the Approved Sale was arranged and (ii) waive any
dissenter's rights and other similar rights. Each holder of Investor Stock will
take all necessary and desirable actions as directed by the Board and the
Approving Stockholders in connection with the consummation of any Approved Sale,
including without limitation executing the applicable purchase agreement and
granting identical indemnification rights; provided, that any indemnification
payment required to be made by each Investor hereunder shall not exceed, either
individually or in the aggregate, the total consideration received by such
Investor in connection with the consummation of any Approved Sale. Each holder
of Investor Stock shall be required to make indemnification payments in
connection with any Approved Sale only to the extent that the amount required to
be paid by such holder of Investor Stock is proportionate to the proportion of
the total consideration received by all holders of Stockholder Shares, compared
to the consideration actually received by such holder of Investor Stock;
provided, that any indemnification payment required to be made by each Investor
hereunder shall not exceed, either individually or in the aggregate, the total
consideration received by such Investor in connection with the consummation of
any Approved Sale.

            (c) All holders of Investor Stock will bear their pro rata share
(based upon the number of shares sold) of the reasonable out-of-pocket costs of
any sale of Company Shares pursuant to an Approved Sale to the extent such costs
are incurred for the benefit of all selling holders of Stockholder Shares and
are not otherwise paid by the Company or the acquiring party. Costs incurred by
any holder of Investor Stock on its own behalf will not be considered costs of
the transaction hereunder.

            (d) This Section 4 shall terminate automatically upon the
consummation of an Initial Public Offering.

            (e) The provisions of this Section 4 shall not be applicable to any
Investor who exercises his put rights under Section 9 hereof in connection with
such Approved Sale.

            5. Transfers in Violation of Agreement. Any Transfer or attempted
Transfer of any shares of Investor Stock in violation of any provision of this
Agreement shall be null and void, and the Company shall not record such Transfer
on its books or treat any purported transferee of such Stockholder Shares as the
owner of such shares for any purpose.

            6. Stockholders' Rights of First Refusal on Company's Issuance of
Equity Equivalents. (a) If at any time the Company wishes to issue any equity
securities or any options, warrants or other rights to acquire equity securities
(collectively, the "Equity Equivalents") to any Person or Persons, the Company
shall promptly deliver a notice of intention to sell (the "Company's Notice of
Intention to Sell") to each Stockholder setting forth a description of the
Equity Equivalents to be sold and the proposed purchase price and terms of sale.
Upon receipt of the Company's Notice of Intention to Sell, each Stockholder
shall have the right to elect to purchase, at the price and on the terms stated
in the Company's Notice of Intention to Sell, a number of the Equity Equivalents
equal to such Stockholder's aggregate proportionate ownership of Common Stock
and rights to acquire Common Stock (calculated on a fully-diluted basis assuming
all holders of then outstanding warrants, options and convertible securities of
the Company had converted such securities or

                                      -11-
<PAGE>   12
exercised such warrants or options immediately prior to the taking of the record
of the holders of Common Stock for the purpose of determining whether they are
entitled to receive such offer) held by all Stockholders multiplied by the
number of Equity Equivalents to be issued. Such election is to be made by the
electing Stockholder by written notice to the Company within ten (10) days after
receipt by such Stockholder of the Company's Notice of Intention to Sell (the
"Acceptance Period for Equity Equivalents"). Each Stockholder shall also have
the option, exercisable by so specifying in such written notice, to purchase on
a pro rata basis similar to that described above, any remaining Equity
Equivalents not purchased by other Stockholders, in which case the Stockholders
exercising such further option shall be deemed to have elected to purchase such
remaining Equity Equivalents on such pro rata basis as described above (provided
that the denominator used to determine pro rata ownership shall be the number of
shares of Common Stock, determined on a fully diluted basis, held by all holders
exercising such further option). In the event that the Equity Equivalents to be
issued at any time as contemplated by this Section 6 are either voting
securities of the Company or securities which are convertible, exercisable or
otherwise exchangeable for voting securities of the Company and for any reason
one or more of the Stockholders determines in its sole discretion that it would
be detrimental to such Stockholder or its affiliates to purchase such securities
as provided for hereby, then the Company shall make available to any such
Stockholder an amount of alternative securities equal to the amount of such
Equity Equivalents as such Stockholder is entitled to purchase pursuant to the
terms hereof which are identical to such Equity Equivalents in all respects
except for the fact that such alternate securities shall be non-voting
securities or convertible, exercisable or otherwise exchangeable for non-voting
securities (the "Alternative Securities").

            (b) If effective acceptance shall not be received pursuant to
paragraph (a) above in respect of all the Equity Equivalents or Alternative
Securities, then the Company may, at its election, during a period of one
hundred and twenty (120) days following the expiration of the Acceptance Period
for Equity Equivalents, sell and issue the remaining Equity Equivalents to
another person at a price and upon terms not more favorable to such person than
those stated in the Company's Notice of Intention to Sell; provided, however,
that failure by a Stockholder to exercise its option to purchase with respect to
one offering, sale and issuance of Equity Equivalents shall not affect its
option to purchase Equity Equivalents or rights to acquire Equity Equivalents in
any subsequent offering, sale and purchase. In the event the Company has not
sold the Equity Equivalents, or entered into a binding agreement to sell the
Equity Equivalents, within such one hundred and twenty (120) day period, the
Company shall not thereafter issue or sell any Equity Equivalents without first
offering such securities to each Stockholder in the manner provided in Section
6(a) hereof.

            (c) If a Stockholder gives the Company notice, pursuant to the
provisions of this Section 6, that such Stockholder desires to purchase any of
the Equity Equivalents or Alternative Securities, payment therefor shall be by
check or wire transfer, against delivery of the securities at the executive
offices of the Company within ten (10) days after giving the Company such
notice, or, if later, the closing date as mutually agreed between the Company
and such Stockholder for the sale of such Equity Equivalents or Alternative
Securities. In the event that any such proposed issuance is for a consideration
other than cash, such Stockholders will be entitled to pay cash for each share
or other unit, in lieu of such other consideration, in the amount determined in
good faith by the Board to constitute the fair value of such consideration other
than cash to be paid per share or other unit.

                                      -12-
<PAGE>   13
            (d) The right of first refusal contained in this Section 6 shall not
apply to (i) the issuance of shares of Common Stock as a stock dividend or upon
any subdivision or stock split of the outstanding shares of Common Stock; (ii)
the issuance of shares of Common Stock upon conversion of any shares of
convertible securities (including, without limitation, the Series A Preferred
Stock); (iii) the issuance of shares of Common Stock, or the grant of options,
warrants or rights to subscribe for shares of Common Stock, to officers,
directors and other employees of the Company and to consultants to the Company
pursuant to stock options to purchase up to 63,830 shares of Common Stock that
are issued pursuant to the Stock Option Plan or such other options that are
granted to such persons and that are approved by a majority of the entire Board
(in each case, as such number of shares may be adjusted from time to time in
accordance with the terms of the Stock Option Plan or agreements evidencing
grants thereunder); or (iv) the issuance of Common Stock pursuant to any
under-written public offering.

            7. Transfer of Investor Stock.

            (a) Shares of Investor Stock are transferable only pursuant to (i)
public offerings registered under the Securities Act, and (ii) subject to the
provisions of Section 3 and Section 4 above, Rule 144 or Rule 144A (or any
similar rule or rules then in effect) of the SEC if such rule is available, and
(iii) subject to Section 3, Section 4 and Section 7(b) below, any other legally
available means of Transfer.

            (b) In connection with the Transfer of any shares of Investor Stock
other than a Transfer described in clause (i) or (ii) of Section 7(a) above, the
holder thereof shall deliver written notice to the Company describing in
reasonable detail the Transfer or proposed Transfer, together with an opinion of
counsel reasonably acceptable to the Company to the effect that such Transfer of
shares of Investor Stock may be effected without registration of such shares of
Investor Stock under the Securities Act. In addition, if the holder of the
shares of Investor Stock delivers to the Company an opinion of counsel that no
subsequent Transfer of such shares of Investor Stock shall require registration
under the Securities Act, the Company shall promptly upon such contemplated
Transfer deliver new certificates for such shares of Investor Stock which do not
bear the legend set forth in Section 7 below. If the Company is not required to
deliver new certificates for such shares of Investor Stock not bearing such
legend, the holder thereof shall not consummate a Transfer of the same until the
prospective transferee has confirmed to the Company in writing its agreement to
be bound by the conditions contained in this Section 7 below.

            (c) Upon the request of a holder of Investor Stock, the Company
shall promptly supply to such Person or its prospective transferees all
information regarding the Company required to be delivered in connection with a
Transfer pursuant to Rule 144A or Rule 144 (or any similar rule or rules then in
effect) of the SEC.

            (d) Upon the request of any holder of Investor Stock, the Company
shall remove the legend set forth in Section 10 below from the certificates for
such holder's shares of Investor Stock; provided, that such shares of Investor
Stock are eligible for sale pursuant to Rule 144(k) (or any similar rule or
rules then in effect) of the SEC.

                                      -13-
<PAGE>   14
            8. Deliveries. The Company shall furnish to each Investor, for so
long as such Investor holds any Stockholder Shares:

            (a) Financial Information. (i) Within 30 days after the end of the
second fiscal quarter of each fiscal year, a copy of the consolidated balance
sheets of the Company and its Subsidiaries as of the end of such period, and the
related consolidated statements of income, changes in stockholders' equity, and
cash flow for the period then ended, prepared in accordance with GAAP (subject
to normal year-end adjustments and the exclusion of such footnotes as may be
required in accordance with GAAP), and accompanied by comparisons to the
Company's annual budget and to the corresponding periods in the preceding fiscal
year.

                  (ii) Within 90 days after the end of each fiscal year, a copy
of the audited consolidated balance sheets of the Company and its Subsidiaries
as of the end of such period, and the related consolidated statements of income,
changes in stockholders' equity, and cash flow for the period then ended,
setting forth in comparative form in each case the consolidated figures for the
previous fiscal year-end, which financial statements shall be prepared in
accordance with GAAP and certified without qualification by Ernst & Young,
L.L.P. or any other "big-six" accounting firm selected by the Company.

                  (iii) Not later than the commencement of each fiscal year, an
annual business plan, including a budget and detailed financial projections for
the Company, for such fiscal year, together with underlying assumptions thereto.

            (b) Notices to Stockholders. Promptly after the furnishing thereof,
copies of any report, letter, notice, statement or other information furnished
by the Company to the Stockholders.

            (c) Other Information. With reasonable promptness, such other data
and information as from time to time may be reasonably requested by any
Investor.

            8A. Inspection Rights. Each Investor shall have reasonable access to
the Company's and each Subsidiary's books and records, and other documents and
data of the Company and each Subsidiary, and any such Investor may, at its own
expense, make copies of all such books and records, and other documents and
data. Without limiting the rights of each Investor as provided in this Section
8A, the Investor shall use reasonable efforts to coordinate their inspection so
as not to burden unreasonably the Company or any Subsidiary.

            9. Put Arrangements.

            (a) If (x) the Company shall not have consummated an Initial Public
Offering by the third anniversary of the date hereof (such date, the "Third
Anniversary") or (y) the Company consummates an Approved Sale or consummates a
public offering or liquidates, each Investor shall have the right within ninety
(90) days following the Third Anniversary or prior to or simultaneously with the
closing of the Approved Sale, public offering, or liquidation (the "Put
Period"), to require the Company to repurchase all or any portion of the Common
Stock held by such Investor at the Put Price (the "Put") by delivering written
notice to the Company specifying the number of shares of

                                      -14-
<PAGE>   15
Common Stock to be repurchased by the Company (the "Put Notice"). The right to
exercise the Put shall inure to the benefit of all Transferees of Investor Stock
(other than transferees in a Public Sale).

            (b) Within ten (10) Business Days after an Investor delivers a Put
Notice to the Company, the Company shall purchase and such Investor (the
"Selling Investor") shall sell the number of shares of Common Stock specified in
the Put Notice at a mutually agreeable time and place (the "Put Closing").

            (c) At the Put Closing, the Selling Investor shall deliver to the
Company certificates representing the shares of Common Stock to be repurchased
by the Company free and clear of all liens and encumbrances and duly endorsed in
blank or accompanied by duly executed forms of assignment, and the Company shall
deliver to the Selling Investor the Put Price by cashier's or certified check
payable to the Selling Investor or by wire transfer of immediately available
funds to an account designated by the Selling Investor; provided, that if and to
the extent any such purchase for cash is prohibited by (x) the provisions of
applicable state law or (y) the terms and conditions of the Company's financing
agreements with its primary lender such that the Put Closing would cause a
default under the terms and conditions of such financing agreements, the amount
of the Put Price which is not able to be paid in cash shall be paid for by the
issuance of subordinated promissory notes with a maturity of ten years and
bearing interest on the unpaid principal amount of such notes at a rate equal to
the Prime Rate, in each case subject to the terms and conditions of the
Company's financing agreements; provided, further, that the Selling Investor
shall be entitled to rescind any portion of the exercised Put if any portion of
the Put Price would be payable by a subordinated promissory note; and provided
further, that the Company shall use its reasonable best efforts to arrange
alternate financing in order to pay the Put Price in cash and will give the
Investor notice at such time as alternate financing has been arranged.
Notwithstanding any limitation contained herein on the period during which an
Investor may exercise the Put, in the event a Selling Investor rescinds any
portion of the exercised Put pursuant to the foregoing sentence of this Section
9(c) (a "Put Recission"), such Selling Investor shall be entitled to exercise
the Put at any time following a Put Recission in accordance with the terms and
conditions of this Section 9.

            9A. Negative Covenants. Without the prior written approval of the
holder or holders of a majority of the shares of Investor Stock then
outstanding, the Company will not:

                  (i) declare or pay any dividends, or make any distributions,
upon the Common Stock;

                  (ii) redeem, purchase or otherwise acquire any of the Common
Stock, except for redemptions, purchases or acquisitions of Common Stock held by
members of management of the Company in connection with the death, disability or
termination of employment of any such Persons;

                  (iii) enter into (directly or indirectly), or permit any
Subsidiary to enter into, any transaction with any officer, director or
stockholder of the Company, any of their respective Affiliates, or any entity in
which any officer, director or stockholder of the Company or any of their
respective Affiliates may have an interest on terms less favorable than the
Company could obtain in a transaction with an unrelated party; or

                                      -15-
<PAGE>   16
                  (iv) become subject to, or permit any of its Subsidiaries to
become subject to, any agreement or instrument, which by its terms would
materially restrict the Company's right to perform any of its obligations
pursuant to the terms of this Agreement.

            10. Legend. The certificates representing the Investor Stock will
bear the following legend:

      THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE ORIGINALLY ISSUED AS
      OF JUNE 2, 1999, HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
      1933, AS AMENDED (THE "ACT"), AND MAY NOT BE SOLD OR TRANSFERRED IN THE
      ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT OR AN
      EXEMPTION FROM REGISTRATION THEREUNDER. THE TRANSFER OF THE SECURITIES
      REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO A SUBSCRIPTION AGREEMENT
      DATED AS OF JUNE 2, 1999, BY AND AMONG THE ISSUER OF SUCH SECURITIES (THE
      "COMPANY") AND CERTAIN OTHER PERSONS SIGNATORY THERETO. A COPY OF SUCH
      SUBSCRIPTION AGREEMENT WILL BE FURNISHED WITHOUT CHARGE BY THE COMPANY TO
      THE HOLDER HEREOF UPON WRITTEN REQUEST.

The legend set forth above shall be removed from the certificates evidencing any
shares which cease to be shares of Investor Stock.

            11. Notices. All notices, demands or other communications to be
given or delivered under or by reason of the provisions of this Agreement will
be in writing and will be deemed to have been given when delivered personally,
mailed by certified or registered mail, return receipt requested and postage
prepaid, or sent via a nationally recognized overnight courier, or sent via
facsimile to the recipient. Such notices, demands and other communications will
be sent to the address indicated below:

            To the Company:

                  Centurion International, Inc.
                  3425 North 44th Street
                  Lincoln, Nebraska  68504
                  Attention:  Gary L. Kuck, President
                  Fax No.:    (402) 467-4528

                                      -16-
<PAGE>   17
                  With copies to:

                  Cornerstone, L.L.C.
                  717 Fifth Avenue
                  Suite 1100
                  New York, New York  10022
                  Attention:  Mark Rossi
                              Robert Getz
                  Fax No.:    (212) 826-6798

                  and:

                  Kirkland & Ellis
                  153 East 53rd Street
                  New York, New York  10022-4675
                  Attention:  Frederick Tanne, Esq.
                  Fax No.:    (212) 446-4900

            To the Investors:

                  c/o Sigma Wireless Technologies Ltd.
                  McKee Avenue
                  Finglas, Dublin 11
                  Ireland
                  Attention:  Peter Crowley

or such other address or to the attention of such other Person as the recipient
party shall have specified by prior written notice to the sending party.

            12. Miscellaneous.

            (a) Survival of Representations and Warranties. All representations
and warranties contained herein or made in writing by any party in connection
herewith shall survive the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby.

            (b) Severability. Whenever possible, each provision of this
Agreement will be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will not affect
any other provision or any other jurisdiction, but this Agreement will be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

            (c) Complete Agreement. This Agreement and the other documents of
even date herewith which have been executed by the Company and the Investors
embody the complete

                                      -17-
<PAGE>   18
agreement and understanding among the parties and supersede and preempt any
prior understandings, agreements or representations by or among the parties,
written or oral, which may have related to the subject matter hereof in any way.

            (d) Counterparts. This Agreement may be executed in separate
counterparts, each of which is deemed to be an original and all of which taken
together constitute one and the same agreement.

            (e) Successors and Assigns. Except as otherwise provided herein,
this Agreement shall bind and inure to the benefit of and be enforceable by the
parties hereto and their respective successors and assigns (including subsequent
holders of Investor Stock); provided, that the rights and obligations of the
Investors under this Agreement shall not be assignable except in connection with
a permitted Transfer of Investor Stock hereunder.

            (f) GOVERNING LAW. ALL QUESTIONS CONCERNING THE CONSTRUCTION,
VALIDITY AND INTERPRETATION OF THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE DOMESTIC LAWS OF THE STATE OF NEW YORK, WITHOUT GIVING
EFFECT TO ANY CHOICE OF LAW OR CONFLICT OF LAW PROVISION OR RULE (WHETHER OF THE
STATE OF NEW YORK OR ANY OTHER JURISDICTION) THAT WOULD CAUSE THE APPLICATION OF
THE LAWS OF ANY JURISDICTION OTHER THAN THE STATE OF NEW YORK.

            (g) Remedies. Each of the parties to this Agreement (including
Cornerstone) will be entitled to enforce its rights under this Agreement
specifically, to recover damages and costs (including reasonable attorneys'
fees) caused by any breach of any provision of this Agreement and to exercise
all other rights existing in its favor. The parties hereto agree and acknowledge
that money damages may not be an adequate remedy for any breach of the
provisions of this Agreement and that any party may in its sole discretion apply
to any court of law or equity of competent jurisdiction (without posting any
bond or deposit) for specific performance and/or other injunctive relief in
order to enforce or prevent any violations of the provisions of this Agreement.

            (h) Waiver of Jury Trial. The parties to this Agreement each hereby
waives, to the fullest extent permitted by law, any right to trial by jury of
any claim, demand, action, or cause of action (i) arising under this Agreement
or (ii) in any way connected with or related or incidental to the dealings of
the parties hereto in respect of this Agreement or any of the transactions
related hereto, in each case whether now existing or hereafter arising, and
whether in contract, tort, equity, or otherwise. The parties to this Agreement
each hereby agrees and consents that any such claim, demand, action, or cause of
action shall be decided by court trial without a jury and that the parties to
this Agreement may file an original counterpart of a copy of this Agreement with
any court as written evidence of the consent of the parties hereto to the waiver
of their right to trial by jury.

                                      -18-
<PAGE>   19
            (i) Amendment and Waiver. (i) Except as otherwise provided herein,
no modification, amendment or waiver of any provision of this Agreement shall be
effective against the Company or the Investors unless such modification,
amendment or waiver is approved in writing by the Company or the holders of not
less than 51% of the Investor Stock, respectively. The failure of any party to
enforce any of the provisions of this Agreement shall in no way be construed as
a waiver of such provisions and shall not affect the right of such party
thereafter to enforce each and every provision of this Agreement in accordance
with its terms.

                  (ii) The Company shall not amend, modify or waive any of the
terms of the Series B Preferred contained in the Company's Articles of
Incorporation without the consent of the Investors if any such amendment,
modification or waiver (x) adversely affects the Investors and (y) is
prejudicial to such Investors relative to the Stockholders.

                               *   *   *   *   *

                                      -19-
<PAGE>   20
            IN WITNESS WHEREOF, the parties hereto have executed this
Subscription Agreement as of the date first written above.

                                 CENTURION INTERNATIONAL, INC.

                                 By:   /s/ Gary L. Kuck
                                       ____________________________________
                                       Name:  Gary L. Kuck
                                       Title: President

                                 /s/ James Anthony Boyle
                                 __________________________________________
                                 James Anthony Boyle

                                 /s/ Michael McGinley
                                 __________________________________________
                                 Michael McGinley

                                 /s/ Peter Crowley
                                 __________________________________________
                                 Peter Crowley

ACKNOWLEDGED AND AGREED:

CORNERSTONE EQUITY INVESTORS IV, L.P.

By:   Cornerstone IV, L.L.C.
Its:  General Partner

By:   /s/ Robert H. Getz
      _______________________________________
      Name:  Robert H. Getz
      Title: Managing Director

<PAGE>   21
PRUDENTIAL PRIVATE EQUITY INVESTORS III, L.P.

By:   Prudential Equity Investors, Inc.
Its:  General Partner

By:   Cornerstone Equity Investors, L.L.C.
Its:  Investment Advisor

By:   /s/ Robert H. Getz
      -----------------------------
Its:  Managing Director

KUCK INVESTMENT PARTNERS, L.P.

By:   /s/ Gary L. Kuck
      -----------------------------
Name: Gary L. Kuck
Title:Managing Agent

<PAGE>   22
                                    EXHIBIT A

                               FORM OF JOINDER TO
                             SUBSCRIPTION AGREEMENT

            THIS JOINDER to the Subscription Agreement, dated as of May __, 1999
by and among Centurion International, Inc., a Delaware corporation (the
"Company"), and James Anthony Boyle ("Boyle"), Michael McGinley ("McGinley"),
and Peter Crowley ("Crowley" and, together with Boyle and McGinley, the
"Investors") (the "Agreement"), is made and entered into as of _________ by and
between the Company and _________________ ("Holder"). Capitalized terms used
herein but not otherwise defined shall have the meanings set forth in the
Agreement.

            WHEREAS, Holder has acquired certain shares of Common Stock ("Holder
Stock"), and the Agreement and the Company requires Holder, as a holder of
Common Stock, to become a party to the Agreement, and Holder agrees to do so in
accordance with the terms hereof.

            NOW, THEREFORE, in consideration of the mutual covenants contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties to this Joinder hereby agree as
follows:

            1. Agreement to be Bound. Holder hereby agrees that upon execution
of this Joinder, it shall become a party to the Agreement and shall be fully
bound by, and subject to, all of the covenants, terms and conditions of the
Agreement as though an original party thereto and shall be deemed a holder of
Investor Stock for all purposes thereof. In addition, Holder hereby agrees that
all Common Stock held by Holder shall be deemed Investor Stock for all purposes
of the Agreement.

            2. Successors and Assigns. Except as otherwise provided herein, this
Joinder shall bind and inure to the benefit of and be enforceable by the Company
and its successors and assigns and Holder and any subsequent holders of Holder
Stock and the respective successors and assigns of each of them, so long as they
hold any shares of Holder Stock.

            3. Counterparts. This Joinder may be executed in separate
counterparts each of which shall be an original and all of which taken together
shall constitute one and the same agreement.

            4. Notices. For purposes of Section 11 of the Agreement, all
notices, demands or other communications to the Holder shall be directed to:

                        [Name]
                        [Address]
                        [Facsimile Number]

            5. GOVERNING LAW. ALL QUESTIONS CONCERNING THE CONSTRUCTION,
VALIDITY AND INTERPRETATION OF THIS JOINDER SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE DOMESTIC LAWS OF THE STATE OF NEW YORK, WITHOUT GIVING
EFFECT TO ANY CHOICE OF

                                      -22-
<PAGE>   23
LAW OR CONFLICT OF LAW PROVISION OR RULE (WHETHER OF THE STATE OF NEW YORK OR
ANY OTHER JURISDICTION) THAT WOULD CAUSE THE APPLICATION OF THE LAWS OF ANY
JURISDICTION OTHER THAN THE STATE OF NEW YORK.

            6. Descriptive Headings. The descriptive headings of this Joinder
are inserted for convenience only and do not constitute a part of this Joinder.

                               *   *   *   *   *

                                      -23-
<PAGE>   24
            IN WITNESS WHEREOF, the parties hereto have executed this Joinder as
of the date first above written.

                                CENTURION INTERNATIONAL, INC.

                                By: /s/
                                   ------------------------------
                                Name:
                                Title:

                                [HOLDER]

                                By: /s/
                                    ------------------------------

KNOWLEDGED AND AGREED:

CORNERSTONE EQUITY INVESTORS IV, L.P.

By:   Cornerstone IV, L.L.C.
Its:  General Partner

By: /s/
    ------------------------------
    Name:
    Title:

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