Document:

EXHIBIT 10.15

                             ANTENNAS AMERICA, INC.

                             STOCK OPTION AGREEMENT

         THIS STOCK OPTION AGREEMENT (the "Agreement") is made and entered into,
effective as of February 15, 1999, by and between Antennas America, Inc., a Utah
corporation (the "Company"), and Jasco Products Co., Inc. (the "Optionee").

                                   WITNESSETH:

         WHEREAS,  pursuant to the terms of the unsecured  Promissory  Note (the
"Note")  dated as of February 15, 1999  whereby the Company  agrees to repay the
Optionee a certain  sum at a certain  rate of  interest  within one year or at a
later date per the terms of the Note; and

         WHERAS,  Optionee  desired  to  receive  an  option  on the  terms  and
conditions set forth in this Agreement.

         NOW, THEREFORE, the parties agree as follows:

         1. Grant of Option.  The Company  hereby grants to Optionee,  the right
and option (the "Option") to purchase all or any part of an aggregate of 500,000
shares of the  authorized  and  unissued  $.0005 par value  common  stock of the
Company (the "Option Shares")  pursuant to the terms and conditions set forth in
this Agreement.

         2. Option Price.  At any time when shares are to be purchased  pursuant
to the Option,  the  purchase  price for each Option Share shall be a minimum of
$.01 per share and a maximum of $.03 (the "Option Price"). If within 1 year from
the date of this  Agreement the average  weighted  listed price of the Company's
common stock is not at least $.06 per share,  30 days prior to the expiration of
this Stock Option Agreement,  on an adjusted basis for stock splits,  the Option
price will be adjusted accordingly to at least 50% of the Company's common stock
price at that time with a minimum Option Price of $.01 per share.

         3.  Exercise  Period.  The period for the exercise of the options shall
commence on the date of this  Agreement  and shall  terminate  one year from the
date of this Agreement.

         4. Exercise Of Option.

         (a) The Option may be  exercised in whole or in part by  delivering  to
the  Treasurer of the Company (i) a Notice And  Agreement Of Exercise Of Option,
substantially in the form attached hereto as Exhibit A, specifying the number of
Option  Shares  with  respect  to which the Option is  exercised,  and (ii) full
payment of the Option Price for such shares. The Options may not be exercised in
part  unless the  purchase  price for the Option  Shares  purchased  is at least
$1,000  or  unless  the  entire  remaining  portion  of the  Options  are  being
exercised.

         (b) Promptly  upon  receipt of the Notice Of Agreement  And Exercise Of
Option and the full payment of the Option  Price,  the Company  shall deliver to
the Optionee a properly  executed  certificate or certificates  representing the
Option Shares being purchased.

<PAGE>

         5.  Withholding  Taxes.  The  Company  may take such  steps as it deems
necessary or appropriate  of the  withholding of any taxes which the Company may
be required by any law or  regulation  or any  governmental  authority,  whether
federal, state or local, domestic or foreign, to withhold in connection with the
Options.

         6.  Securities  Laws  Requirements.  No Option  Shares  shall be issued
unless and until,  in the opinion of the Company,  any  applicable  registration
requirements  of the  Securities  Act of 1933 as amended (the "1933  Act"),  any
applicable listing requirements of any securities exchange on which stock of the
same class has been listed,  and any other requirements of law or any regulatory
bodies  having  jurisdiction  over such  issuance and  delivery,  or  applicable
exemptions are available and have been fully complied with pursuant to the terms
of the Notice and Agreement Of Exercise Of Option that shall be delivered to the
Company  upon each  exercise  of the Option,  the  Optionee  shall  acknowledge,
represent, warrant and agree as follows:

                  (a) Optionee is  acquiring  the Option  Shares for  investment
purposes only and the Option  Shares that Optionee is acquiring  will be held by
Optionee without sale, transfer or other disposition, other than required by the
1933 Act,  and/or  unless  the  transfer  of those  securities  is  subsequently
registered  under  the  federal   securities  laws  or  unless  exemptions  from
registration are available;

                  (b) Optionee's  overall commitment to investments that are not
readily  marketable  is  not   disproportionate  to  Optionee's  net  worth  and
Optionee's  investment  in  the  Option  Shares  will  not  cause  such  overall
commitments to become excessive;

                  (c)  Optionee's  financial  condition is such that Optionee is
under no present or  contemplated  future  need to dispose of any portion of the
Option  Shares to satisfy any  existing  or  contemplated  undertaking,  need or
indebtedness;

                  (d)  Optionee  has  sufficient  knowledge  and  experience  in
business and  financial  matters to evaluate,  and Optionee has  evaluated,  the
merits and risks of any investment in the Option Shares;

                  (e) The address set forth in this Agreement is Optionee's true
and correct  residence,  and  Optionee  has no present  intention  of becoming a
resident of any other state or jurisdiction;

                  (f) Optionee  confirms  receiving  and reviewing the Company's
Annual  Report on Form 10-KSB for the year ended  December 31, 1997 and that the
Company's 1998 Quarterly 10-QSB Reports have been made available or delivered to
Optionee;

                  (g) Optionee has had the  opportunity to ask questions of, and
has  received  the  answers  from,  the  Company  concerning  the  terms  of the
investment in the Option Shares;

                  (h) Optionee  understands  that no federal or state agency has
made any finding or  determination  as to the fairness of this investment or any
recommendation of the sale of the Option Shares;

<PAGE>

                  (i)      Optionee acknowledges and is aware of the following:

                  (a) The Option Shares constitute a speculative  investment and
involve a high degree of risk of loss by Optionee of Optionee's total investment
in the Option Shares.

                  (b) There are substantial  restrictions on the transferability
of the  Option  Shares.  The  Option  Shares  cannot  be  transferred,  pledged,
hypothecated, sold or otherwise disposed of unless they are registered under the
1933 Act or an exemption from such  registration is available and established to
the  satisfaction  of the  Company;  investors  in the Company have no rights to
require that the Option Shares be  registered;  there is no right of presentment
of the Option Shares and there is no obligation by the Company to repurchase any
of the Option  Shares;  and,  accordingly,  Optionee may have to hold the Option
Shares  indefinitely  and it may  not be  possible  for  Optionee  to  liquidate
Optionee's investment in the Company.

                  (c) Each  certificate  issued  representing  the Option Shares
shall  be  imprinted  with  a  legend  that  sets  forth  a  description  of the
restrictions  on  transferability  of those  securities,  which legend will read
substantially as follows:

                  "The securities  represented by this Certificate have not been
registered or qualified under federal or state securities laws. These securities
may not be offered for sale, sold,  pledged,  or otherwise disposed of unless so
registered  or  qualified  or unless an  exemption  from  such  registration  is
available and established to the satisfaction of the Company."

         In the event that the Company  elects to register  any stock or Options
during  the  term  of this  Option  Agreement,  Optionee  will  be  entitled  to
"piggyback"  rights  and  the  Options  may  be  included  in  the  registration
statement.

         The  restrictions  described in this Section 6 or thereof may be placed
on the certificates  representing  the Option Shares  purchased  pursuant to the
Option,  and the Company  may refuse to issue  certificates  or to transfer  the
shares  on  its  books  unless  it  is  satisfied  that  no  violation  of  such
restrictions will occur.

         The  foregoing  restrictions  or notice  thereof shall be placed in the
certificates representing the Option Shares purchased pursuant to the Option and
the Company may refuse to issue the  certificates  or to transfer  the shares on
its books unless it is satisfied  that no  violation of such  restrictions  will
occur.

         7.  Transferability  Of Option.  The Option  shall not be  transferable
except as  provided  in Section  6(i)(b)  and (c) and any attempt to do so shall
void the Option.

         8. Adjustment By Stock Split,  Stock Dividend,  Etc. If at any time the
Company  increases or decreases the number of its  outstanding  shares of Common
Stock, or changes in any way the rights and privileges of such shares,  by means
of the payment of a stock  dividend or the making of any other  distribution  on
such shares payable in its Common Stock, or through a stock split or subdivision
of  shares,   or  a  consolidation  or  combination  of  shares,  or  through  a
reclassification  or  recapitalization  involving its Common Stock, the numbers,
rights and privileges of the shares of Common Stock included in the Option shall
be  increased,  decreased  or changed in like  manner as if such shares had been
issued  and  outstanding,  fully  paid  and  nonassessable  at the  time of such
occurrence.

<PAGE>

         9. Common Stock To Be Received Upon Exercise. Optionee understands that
the Company is under no  obligation  to  register  the Option  Shares  under the
Securities  Act of 1933, as amended (the "Act"),  and that in the absence of any
such  registration,  the  Option  Shares  cannot  be sold  unless  they are sold
pursuant to an exemption from  registration  under the Act. The Company is under
no  obligation  to comply,  or to assist the  Optionee  in  complying,  with any
exemption from such registration  requirement,  including supplying the Optionee
with any  information  necessary to permit  routine  sales of the Option  Shares
under  Rule  144  of the  Securities  And  Exchange  Commission.  Optionee  also
understands  that with respect to Rule 144,  routine sales of securities made in
reliance upon such Rule can be made only in limited  amounts in accordance  with
the terms  and  conditions  of the Rule,  and that in cases in which the Rule is
inapplicable, compliance with either Regulation A or another exemption under the
Act will be required.  Thus, the Option Shares may have to be held  indefinitely
in the absence of registration under the Act or an exemption from registration.

         Furthermore, the Optionee fully understands that the Option Shares have
not been registered  under the Act and that they will be issued in reliance upon
an  exemption  which is  available  only if  Optionee  acquires  such shares for
investment  and not with a view to  distribution.  Optionee is familiar with the
phrase  "acquired  for  investment  and not with a view to  distribution"  as it
relates  to the  Act and the  special  meaning  given  to such  term in  various
releases of the Securities And Exchange Commission.

         10.  Privilege Of Ownership.  Optionee shall not have any of the rights
of a stockholder  with respect to the shares covered by the Option except to the
extent that one or more  certificates  for such shares shall be delivered to him
upon exercise of the Option.

         11.  Notices.  All notices,  requests,  demands,  directions  and other
communications  ("Notices")  provided for in this Agreement  shall be in writing
and shall be mailed or delivered  personally  or sent by telecopier or facsimile
to the  applicable  party at the  address of such party set forth  below in this
Section  11.  When  mailed,  each  such  Notice  shall be sent by  first  class,
certified mail, return receipt requested, enclosed in a postage prepaid wrapper,
and shall be effective on the third  business day after it has been deposited in
the mail.  When delivered  personally,  each such Notice shall be effective when
delivered to the address for the respective  party set forth in this Section 11.
When sent by telecopier or facsimile, each such Notice shall be effective on the
first business day on which or after which it is sent. Each such Notice shall be
addressed to the party to be notified as shown below:

         Company:                           Antennas America, Inc.
                                            4860 Robb Street, Suite 101
                                            Wheat Ridge, Colorado 80033
                                            Attention:  Treasurer
                                            Facsimile No. (303) 424-5085

         Optionee:                          Jasco Products Co., Inc.
                                            311 N.W. 122nd Street
                                            Oklahoma City, OK 73114
                                            Attention:  Chief Financial Officer
                                            Facsimile No. (405) 752-1537

         Either party may change his or its  respective  address for purposes of
this  Section  11 by giving  the other  party  Notice of the new  address in the
manner set forth above.

         12.  General  Provisions.  This  instrument  (a)  contains  the  entire
agreement  between  the  Parties,  (b) may  not be  amended  nor may any  rights
hereunder  be waived  except by an  instrument  in  writing  signed by the party
sought to be charged with such  amendment  or waiver,  (c) shall be construed in
accordance with, and governed by, the laws of Colorado, and (d) shall be binding
upon and shall inure to the benefit of the parties and their respective personal
representatives and assigns, except as above set forth below.

<PAGE>

         All  pronouns  contained  herein and any  variations  thereof  shall be
deemed to refer to the masculine,  feminine or neuter, singular or plural as the
identity of the parties hereto may require.

         IN WITNESS WHEREOF,  the parties have executed this Agreement the dates
set forth below.

                                         ANTENNAS AMERICA, INC.
                                         By:

Date:  February 15, 1999                 /s/ Randall P. Marx
                                         ------------------------------------
                                         Randall P. Marx
                                         Chief Executive Officer

                                         OPTIONEE
                                         By:

Date:  February 15, 1999                 /s/ Scott Busby
                                         ------------------------------------
                                         Scott Busby, Vice Pres. And CFO for
                                         Jasco Products Co., Inc.

<PAGE>

                                    EXHIBIT A

               (To Antennas America, Inc. Stock Option Agreement)

                             ANTENNAS AMERICA, INC.

                   NOTICE AND AGREEMENT OF EXERCISE OF OPTION

         Jasco Products Co., Inc. (the "Optionee")  hereby exercises  Optionee's
Antennas America, Inc. Stock Option dated effective as of this date ___________,
______ to  ________  shares of the $.0005 par value  Common  Stock (the  "Option
Shares") of Antennas America, Inc. (the "Company").

         Enclosed is the payment per Paragraph 2 of the Agreement.

         Optionee  understands  that no Option  Shares will be issued unless and
until, in the opinion of the Company, any applicable  registration  requirements
of the Securities Act of 1933, as amended,  any applicable listing  requirements
of any securities  exchange on which stock of the same class is then listed, and
any other requirements of law or any regulatory bodies having  jurisdiction over
such  issuance and delivery,  shall have been fully  complied with or exemptions
therefrom  have  been  fully  complied  with.   Optionee  hereby   acknowledges,
represents, warrants and agrees, to and with the Company as follows:

         a.       The Option Shares  Optionee is purchasing  are being  acquired
                  for its own account for  investment  purposes only and with no
                  view to their  distribution  of any kind,  and no other person
                  will own any interest therein.

         b.       Optionee  will not sell or  dispose  of its  Option  Shares in
                  violation of the  Securities  Act Of 1933, as amended,  or any
                  other applicable federal or state securities laws.

         c.       Optionee  agrees that the Company may,  without  liability for
                  its  good  faith  actions,   place  legend  restrictions  upon
                  Optionee's   Option   Shares   and   issue   "stop   transfer"
                  instructions  requiring compliance with applicable  securities
                  laws and the terms of the Option.

         The  number of Option  Shares  specified  above are to be issued in the
name or names set forth below.

                                      OPTIONEE:

                                      Jasco Products Co., Inc.

                                      By: ________________________________
                                               Signature

                                      ------------------------------------
                                               Printed Name and Title<PAGE>

                                                                  EXHIBIT 10.1

                    FOURTH AMENDMENT TO CREDIT AGREEMENT
                    ------------------------------------

          1.  Reference is made to that certain Credit Agreement dated as of
June 6, 1997 (the "Credit Agreement"), as amended by that certain First
                   ----------------
Amendment to Credit Agreement dated as of June 26, 1998, as further amended by
that certain Second Amendment to Credit Agreement dated as of December 18, 1998
and as further amended by that certain Third Amendment to Credit Agreement dated
as of August 31, 1999 by and among Quantum Corporation, a Delaware corporation
(the "Borrower"), each of the financial institutions listed in Schedule I to the
                                                               -----------------
Credit Agreement (individually, a "Bank" and, collectively, the "Banks"),
----------------                   ----                          -----
Canadian Imperial Bank of Commerce, as administrative agent for the Banks (in
such capacity, "Administrative Agent"), ABN AMRO Bank, N.V ("ABN"), and CIBC
                --------------------
Inc., as co-arrangers for the Banks, ABN, as syndication agent for the Banks,
Bank of America, N.A. (formerly known as Bank of America National Trust and
Savings Association), as documentation agent for the Banks, and BankBoston,
N.A., The Bank of Nova Scotia, Fleet National Bank and The Industrial Bank of
Japan, Limited, as co-agents for the Banks (as amended, the "Credit Agreement").
                                                             ----------------

          2.  The Banks executing this Amendment constituting Majority Banks
hereby agree that, subject to the satisfaction of the conditions set forth in
Paragraph 3 below, Subparagraph 5.02(f) of the Credit Agreement is hereby
-----------        --------------------------------------------
amended by changing clause (iv) thereof to read in its entirety as follows:
                    -----------

              (iv) Borrower may purchase Equity Securities pursuant to stock
          repurchase programs, provided that the aggregate payments under such
          programs do not exceed (A) during fiscal year 1999, twenty-three
          percent (23%) of Tangible Net Worth as determined as of the fiscal
          quarter ending March 31, 1998, (B) during fiscal year 2000, twenty
          percent (20%) of Tangible Net Worth as determined as of the fiscal
          quarter ending June 27, 1999 plus an additional seventy five million
          dollars ($75,000,000), and (C) during all other fiscal years until the
          Maturity Date, ten percent (10%) of Tangible Net Worth as determined
          as of the fiscal quarter immediately preceding the date of
          determination;

          3.  The amendment effected by Paragraph 2 above shall become effective
                                        -----------
as of 8:30 a.m. Pacific Standard Time November 8, 1999 (the "Effective Date"),
                                                             --------------
subject to:  (1) receipt by Orrick, Herrington & Sutcliffe LLP, counsel to
Administrative Agent, on or prior to the Effective Date, of a duly executed copy
of this Amendment from Borrower and the Banks constituting the Majority Banks;
and (2) receipt by Administrative Agent on behalf of each individual Bank that
executes this Amendment on or prior to the Effective Date of a non refundable
amendment fee payable to each such Bank in the amount of five thousand dollars
($5,000).

          4.  This Amendment shall be governed by and construed in accordance
with the laws of the State of California without reference to conflicts of law
rules.
<PAGE>

          IN WITNESS WHEREOF, the undersigned has caused this Amendment to be
executed as of November 8, 1999.

                              QUANTUM CORPORATION

                          By:  /s/ Andrew Kryder
                              --------------------------------------------------
                              Name:   Andrew Kryder
                              Title:  Vice President, Finance & General Counsel

                              ABN AMRO BANK N.V.

                          By:  /s/ Nanci H. Meyer
                              --------------------------------------------------
                              Name:   Nanci H. Meyer
                              Title:  Vice President

                          By:  /s/ Robert N. Hartinger
                              --------------------------------------------------
                              Name:   Robert N. Hartinger
                              Title:  Senior Vice President

                              BANKBOSTON, N.A.

                          By:  /s/ John B. Desmond
                              --------------------------------------------------
                              Name:   John B. Desmond
                              Title:  Vice President

                              BANKBOSTON, N.A.

                          By:  /s/ Thomas W. Davies
                              --------------------------------------------------
                              Name:   Thomas W. Davies
                              Title:  Senior Vice President

                              THE BANK OF NOVA SCOTIA

                          By:  /s/ John Quick
                              --------------------------------------------------
                              Name:   John Quick
                              Title:  Managing Director

                                       2
<PAGE>

                              BANQUE NATIONALE DE PARIS

                          By:  /s/ Michael D. McCorriston
                              --------------------------------------------------
                              Name:   Michael D. McCorriston
                              Title:  Vice President

                          By:  /s/ David W. Low
                              --------------------------------------------------
                              Name:   David W. Low
                              Title:  Vice President & Manager

                              CANADIAN IMPERIAL BANK OF COMMERCE

                          By:  /s/ Carter Harned
                              --------------------------------------------------
                              Name:   Carter Harned
                              Title:  CIBC World Markets Corp., AS AGENT

                              GENERAL ELECTRIC CAPITAL CORPORATION, as a Bank

                          By:  /s/ Gregory Hong
                              --------------------------------------------------
                              Name:   Gregory Hong
                              Title:  Duly Authorized Signatory

                              KEYBANK NATIONAL ASSOCIATION, as a Bank

                          By:  /s/ Kevin P. McBride
                              --------------------------------------------------
                              Name:     Kevin P. McBride
                              Title:  Senior Vice President

                              MELLON BANK, as a Bank

                          By:  /s/ John N. Cate
                              --------------------------------------------------
                              Name:   John N. Cate
                              Title:  Vice President

                                       3
<PAGE>

                              THE INDUSTRIAL BANK OF JAPAN, LIMITED

                          By:  /s/ Albert Bracht
                              --------------------------------------------------
                              Name:   Albert Bracht
                              Title:  Senior Vice President

                              THE MITSUBISHI TRUST AND BANKING CORPORATION

                          By:  /s/ Beatrice E. Kossodo
                              --------------------------------------------------
                              Name:   Beatrice E. Kossodo
                              Title:  Senior Vice President

                              UNION BANK OF CALIFORNIA, N.A.

                          By:  /s/ Glenn Leyrer
                              --------------------------------------------------
                              Name:   Glenn Leyrer
                              Title:  Vice President

                                       4

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