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                                                                     EXHIBIT 4.1

                               ANDREW CORPORATION
                          REGISTRATION RIGHTS AGREEMENT

         THIS REGISTRATION RIGHTS AGREEMENT (the "AGREEMENT") is entered into as
of the 4th day of June 2002, by and among ANDREW CORPORATION, a Delaware
corporation (the "COMPANY"), and each stockholder of Celiant Corporation, a
Delaware corporation ("CELIANT"), listed on the signature pages hereto (each, a
"STOCKHOLDER" and, collectively, the "STOCKHOLDERS").

                                    RECITALS

         A. The Company, Celiant and Ptolemy Acquisition Co., a Delaware
corporation ("SUB"), have entered into an Agreement and Plan of Merger (the
"MERGER AGREEMENT"), dated February 18, 2002, pursuant to which Celiant will be
merged (the "MERGER") with and into Sub and the shares of capital stock of
Celiant held by the Stockholders will be converted into cash and Common Stock.

         B. It is a condition to Celiant's obligation to consummate the Merger
Agreement that the Company enter into this Agreement.

                                    AGREEMENT

         NOW, THEREFORE, in consideration of the premises, covenants and
conditions set forth in this Agreement, the parties mutually agree as follows:

SECTION 1. GENERAL

         1.1 DEFINITIONS. As used in this Agreement the following terms shall
have the following respective meanings:

                  "COMMON STOCK" means the common stock, $0.01 par value, of
         the Company.

                  "EXCHANGE ACT" means the Securities Exchange Act of 1934,
         as amended.

                  "FORM S-3" means such form under the Securities Act as in
         effect on the date hereof or any successor registration form under the
         Securities Act subsequently adopted by the SEC which permits inclusion
         or incorporation of substantial information by reference to other
         documents filed by the Company with the SEC.

                  "HOLDER" means any Person owning of record Registrable
         Securities that have not been sold to the public or any assignee of
         record of such Registrable Securities

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         in accordance with Section 2.8 hereof, including without limitation the
         Stockholders and their respective permitted successors and assigns.

                  "PERSON" means any individual, trust, corporation,
         partnership, limited partnership, limited liability company or other
         business association or entity, court, governmental body or
         governmental agency.

                  "REGISTER," "REGISTERED," and "REGISTRATION" refer to a
         registration effected by preparing and filing a registration statement
         in compliance with the Securities Act, and the declaration or ordering
         of effectiveness of such registration statement or document.

                  "REGISTRABLE SECURITIES" means Common Stock issued to the
         Stockholders in connection with the Merger.

                  "REGISTRATION EXPENSES" shall mean all expenses incurred by
         the Company in complying with Sections 2.1, 2.2 and 2.3 hereof,
         including, without limitation, all registration and filing fees,
         printing expenses, fees and disbursements of counsel for the Company,
         Blue Sky fees and expenses, the expense of any auditor letter and any
         special audits incident to or required by any such registration, but
         shall specifically exclude Selling Expenses.

                  "RULE 144" means Rule 144 promulgated under the Securities Act
         as in effect on the date hereof or any successor rule or regulation
         under the Securities Act subsequently adopted by the SEC.

                  "SEC" or "COMMISSION" means the Securities and Exchange
         Commission.

                  "SECURITIES ACT" shall mean the Securities Act of 1933, as
         amended.

                  "SELLING EXPENSES" shall mean all underwriting discounts and
         selling commissions applicable to any sale hereunder and all fees and
         expenses of legal counsel to the Holders.

SECTION 2. REGISTRATION

2.1 REQUIRED REGISTRATION.

         (a) REGISTRATION STATEMENT. The Company shall use its reasonable best
efforts to prepare and file as promptly as practicable after the Effective Time
(as defined in the Merger Agreement) with the SEC a registration statement on
Form S-3 with respect to the Registrable Securities (the "REGISTRATION
STATEMENT") and to effect all such registrations, qualifications and compliances
(including, without limitation, obtaining appropriate qualifications under
applicable state securities or "blue sky" laws and compliance with any other
applicable governmental requirements or regulations) as any Holder may
reasonably request and that would permit or facilitate the sale of Registrable
Securities in the open market (provided, however, that the Company shall not be
required in connection therewith to qualify to do business or to file a

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general consent to service of process in any such state or jurisdiction), and
shall use its reasonable best efforts so that such Registration Statement and
all other such registrations, qualifications and compliances may become
effective no later than ninety (90) days following the Effective Time.
Notwithstanding the foregoing, the Company shall not be obligated to effect an
underwritten registration statement.

         (b) EFFECTIVENESS, SUSPENSION RIGHT.

         (i) The Company will use its reasonable best efforts to maintain the
effectiveness of the Registration Statement and other applicable registrations,
qualifications and compliances for up to two (2) years from the Effective Time
(the "REGISTRATION EFFECTIVE PERIOD"), and from time to time will amend or
supplement the Registration Statement and the prospectus contained therein as
and to the extent necessary to comply with the Securities Act, the Exchange Act
and any applicable state securities statute or regulation, subject to the
following limitations and qualifications.

         (ii) Following the date on which the Registration Statement is first
declared effective, the Holders will be permitted (subject in all cases to
Section 2.2 below) to offer and sell Registrable Securities during the
Registration Effective Period in the manner described in the Registration
Statement, provided that the Registration Statement remains effective and has
not been suspended, and provided further that until the first anniversary of the
Effective Time, no Holder shall be permitted to sell Registrable Securities in
excess of the number of Registrable Securities that such Holder would be
entitled to sell under subsection (e) of Rule 144 if the Registrable Securities
were "restricted securities" as defined in Rule 144 (assuming for such purpose
(and for the avoidance of doubt) that one year has elapsed since the Effective
Time and accordingly the volume requirements under subsection (e) of Rule 144
are immediately applicable to the Holders). No such volume limitation shall
apply to any Holder after the first anniversary of the Effective Time;

         (iii) Notwithstanding any other provision of this Section 2.1 but
subject to Section 2.2, the Company shall have the right at any time (but only
five times during the term of this Agreement and no more than three times in any
twelve-month period) to require that all Holders suspend further open market
offers and sales of Registrable Securities whenever, and only if, in the
reasonable good faith judgment of the Company after receipt of advice from
outside counsel there is or there is reasonably likely to be in existence
material undisclosed information or events with respect to the Company (the
"SUSPENSION RIGHT"). In the event the Company exercises the Suspension Right,
such suspension will continue only for the period of time reasonably necessary
for disclosure to occur at a time that is not detrimental to the Company or its
stockholders or until such time as the information or event is no longer
material (but in no event more than 30 days), each as determined in good faith
by the Company after receipt of advice from outside counsel. The Company will
promptly give the Holders notice of any such suspension and will use all
reasonable efforts to minimize the length of the suspension.

2.2 PROCEDURE FOR SALE OF SHARES UNDER REGISTRATION STATEMENT.

         (a) DELIVERY OF PROSPECTUS. For any offer or sale of any of the
Registrable Securities

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by a Holder in a transaction that is not exempt under the Securities Act, the
Holder, in addition to complying with any other federal securities laws, shall
deliver a copy of the final prospectus (or amendment of or supplement to such
prospectus) of the Company covering the Registrable Securities in the form
furnished to the Holder by the Company to the purchaser of any of the
Registrable Securities on or before the settlement date for the purchase of such
Registrable Securities.

         (b) COPIES OF PROSPECTUSES. The Company shall furnish to each Holder a
reasonable number of copies of the final prospectus (or amendment of or
supplement to such prospectus) of the Company covering the Registrable
Securities as may be necessary so that, as thereafter delivered to the
purchasers of such Registrable Securities, such prospectus shall not as of the
date of delivery to the Holder include an untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein not misleading or incomplete in the light of the
circumstances then existing, in each case exclusive of information supplied by
such Holder expressly for inclusion in the Registration Statement.

         2.3      PIGGYBACK REGISTRATIONS.

                  (a) The Company shall notify all Holders in writing at least
         thirty (30) days prior to the filing of any registration statement
         under the Securities Act for purposes of a public offering of
         securities of the Company (including, but not limited to, registration
         statements relating to offerings of securities of the Company for the
         account of stockholders of the Company, but excluding the Registration
         Statement and registration statements on Forms S-4 and S-8) and will
         offer to include in such registration statement all of such Registrable
         Securities held by such Holder. If the registration statement under
         which the Company gives notice under this Section 2.3 is for an
         underwritten offering, the Company shall so advise the Holders in such
         notice. Each Holder desiring to include in any such registration
         statement all or any part of the Registrable Securities held by it
         shall, within fifteen (15) days after receipt of the above-described
         notice from the Company, so notify the Company in writing, provided
         that until the first anniversary of the Effective Time, no Holder shall
         be permitted to sell Registrable Securities in excess of the number of
         Registrable Securities that such Holder would be entitled to sell under
         subsection (e) of Rule 144 if the Registrable Securities were
         "restricted securities" as defined in Rule 144 (assuming for such
         purpose (and for the avoidance of doubt) that one year has elapsed
         since the Effective Time and accordingly the volume requirements under
         subsection (e) of Rule 144 are immediately applicable to the Holders).
         No such volume limitation shall apply to any Holder after the first
         anniversary of the Effective Time. If a Holder decides not to include
         all of its Registrable Securities in any registration statement
         thereafter filed by the Company, such Holder shall nevertheless
         continue to have the right to include any Registrable Securities in any
         subsequent registration statement or registration statements as may be
         filed by the Company with respect to offerings of its securities, all
         upon the terms and conditions set forth herein.

                  (b) If the registration statement under which the Company
         gives notice under this Section 2.3 is for an underwritten offering,
         and the managing underwriters advise the Company in writing that in
         their opinion the number of securities requested to be included in such
         registration (i) creates a substantial risk that the price per share in
         such

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         registration will be materially and adversely affected, or (ii) exceeds
         the number which can be reasonably sold in such offering, then the
         number of shares that may be included in the underwriting shall be
         allocated, first, to the Company if the Company, and not a stockholder,
         initiated the filing of the registration statement; second, to the
         Holders on a pro rata basis based on the total number of Registrable
         Securities held by the Holders desiring to participate in the
         registration and underwriting pursuant to the terms of this Section
         2.3; and third, to any other stockholder of the Company participating
         in such underwritten offering on a pro rata basis based on the number
         of shares that all such stockholders desire to register.

                  (c) RIGHT TO TERMINATE REGISTRATION. The Company shall have
         the right to terminate or withdraw any registration initiated by it
         under this Section 2.3 prior to the effectiveness of such registration
         whether or not any Holder has elected to include Registrable Securities
         in such registration. The Registration Expenses of such withdrawn
         registration shall be borne by the Company in accordance with Section
         2.4 hereof.

         2.4 EXPENSES OF REGISTRATION. Except as provided herein, all
Registration Expenses incurred in connection with any registration,
qualification or compliance pursuant to Section 2.1 or any registration under
Section 2.3 herein shall be borne by the Company. All Selling Expenses incurred
in connection with any registrations hereunder shall be borne by the holders of
the securities so registered pro rata on the basis of the number of shares so
registered.

         2.5 TERMINATION OF REGISTRATION RIGHTS. All registration rights granted
under this Section 2 shall terminate and be of no further force and effect upon
the second anniversary of the Effective Time.

         2.6 DELAY OF REGISTRATION; FURNISHING INFORMATION. It shall be a
condition precedent to the obligations of the Company to take any action
pursuant to Section 2.1 or 2.3 that the selling Holders shall furnish to the
Company such information regarding themselves, the Registrable Securities held
by them and the intended method of disposition of such securities as reasonably
shall be required to effect the registration of their Registrable Securities.

         2.7 INDEMNIFICATION. In the event any Registrable Securities are
included in a registration statement under Section 2.1 or 2.3:

                  (a) To the extent permitted by law, the Company will indemnify
         and hold harmless each Holder, the partners, members, officers and
         directors of each Holder, any underwriter (as defined in the Securities
         Act) and each person, if any, who controls such Holder or underwriter
         within the meaning of the Securities Act or the Exchange Act, against
         any losses, claims, damages, or liabilities (joint or several) to which
         they may become subject under the Securities Act, the Exchange Act or
         other federal or state law, insofar as such losses, claims, damages or
         liabilities (or actions in respect thereof) arise out of or are based
         upon any of the following statements, omissions or violations
         (collectively a "VIOLATION") by the Company: (i) any untrue statement
         or alleged untrue statement of a material fact contained in such
         registration statement, including any preliminary prospectus or final
         prospectus contained therein or any amendments or

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         supplements thereto, (ii) the omission or alleged omission to state
         therein a material fact required to be stated therein, or necessary to
         make the statements therein not misleading, or (iii) any violation or
         alleged violation by the Company of the Securities Act, the Exchange
         Act, any state securities law or any rule or regulation promulgated
         under the Securities Act, the Exchange Act or any state securities law
         in connection with the offering covered by such registration statement;
         and the Company will promptly reimburse to each such Holder, partner,
         member, officer, director, underwriter or controlling person for any
         legal or other expenses reasonably incurred by them in connection with
         investigating or defending any such loss, claim, damage, liability or
         action; PROVIDED HOWEVER, that the indemnity agreement contained in
         this Section 2.7(a) shall not apply to amounts paid in settlement of
         any such loss, claim, damage, liability or action if such settlement is
         effected without the consent of the Company, which consent shall not be
         unreasonably withheld, nor shall the Company be liable in any such case
         for any such loss, claim, damage, liability or action to the extent
         that it arises out of or is based upon a Violation which occurs in
         reliance upon and in conformity with information furnished expressly
         for use in connection with such registration by such Holder, partner,
         member, officer, director, underwriter or controlling person of such
         Holder.

                  (b) To the extent permitted by law, each Holder severally and
         not jointly will, if Registrable Securities held by such Holder are
         included in the securities as to which such registration is being
         effected, indemnify and hold harmless the Company, each of its
         directors, its officers and each person, if any, who controls the
         Company within the meaning of the Securities Act, any underwriter and
         any other Holder selling securities under such registration statement
         or any of such other Holder's partners, members, directors or officers
         or any person who controls such Holder, against any losses, claims,
         damages or liabilities (joint or several) to which the Company or any
         such director, officer, controlling person, underwriter or other such
         Holder, or partner, member, director, officer or controlling person of
         such other Holder may become subject under the Securities Act, the
         Exchange Act or other federal or state law, insofar as such losses,
         claims, damages or liabilities (or actions in respect thereto) arise
         out of or are based upon any Violation, in each case to the extent (and
         only to the extent) that such Violation occurs in reliance upon and in
         conformity with information furnished by such Holder to the Company
         expressly for use in connection with such registration; and each such
         Holder will promptly reimburse to the Company or any such director,
         officer, controlling person, underwriter or other Holder, or partner,
         member, officer, director or controlling person of such other Holder
         any legal or other expenses reasonably incurred by such party in
         connection with investigating or defending any such loss, claim,
         damage, liability or action if it is judicially determined that there
         was such a Violation; provided, however, that the indemnity agreement
         contained in this Section 2.7(b) shall not apply to amounts paid in
         settlement of any such loss, claim, damage, liability or action if such
         settlement is effected without the consent of the Holder, which consent
         shall not be unreasonably withheld; provided further, that in no event
         shall any indemnity under this Section 2.7 exceed the net proceeds from
         the offering received by such Holder.

                  (c) Promptly after receipt by an indemnified party under this
         Section 2.7 of notice of the commencement of any action (including any
         governmental action), such

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         indemnified party will, if a claim in respect thereof is to be made
         against any indemnifying party under this Section 2.7, deliver to the
         indemnifying party a written notice of the commencement thereof and the
         indemnifying party shall have the right to participate in, and, to the
         extent the indemnifying party so desires, jointly with any other
         indemnifying party similarly noticed, to assume the defense thereof
         with counsel mutually satisfactory to the parties; provided, however,
         that an indemnified party shall have the right to retain its own
         counsel, with the fees and expenses to be paid by the indemnifying
         party, if, upon written advice of counsel, representation of such
         indemnified party by the counsel retained by the indemnifying party
         would be inappropriate due to actual or potential differing interests
         between such indemnified party and any other party represented by such
         counsel in such proceeding. If an indemnified party fails to deliver
         written notice to the indemnifying party within a reasonable time after
         the indemnified party's receipt of notice of the commencement of any
         such action, the indemnifying party's liability under this Section 2.7
         shall be reduced to the extent such failure to notify was prejudicial
         to the indemnifying party's ability to defend such action, but the
         omission to so deliver written notice to the indemnifying party will
         not relieve it of any liability that it may have to any indemnified
         party otherwise than under this Section 2.7.

                  (d) If the indemnification provided for in this Section 2.7 is
         held by a court of competent jurisdiction to be unavailable to an
         indemnified party with respect to any losses, claims, damages or
         liabilities referred to herein, the indemnifying party, in lieu of
         indemnifying such indemnified party thereunder, shall to the extent
         permitted by applicable law contribute to the amount paid or payable by
         such indemnified party as a result of such loss, claim, damage or
         liability in such proportion as is appropriate to reflect the relative
         fault of the indemnifying party on the one hand and of the indemnified
         party on the other in connection with the Violation(s) that resulted in
         such loss, claim, damage or liability, as well as any other relevant
         equitable considerations. The relative fault of the indemnifying party
         and of the indemnified party shall be determined by a court of law by
         reference to, among other things, whether the untrue or alleged untrue
         statement of a material fact or the omission to state a material fact
         relates to information supplied by the indemnifying party or by the
         indemnified party and the parties' relative intent, knowledge, access
         to information and opportunity to correct or prevent such statement or
         omission; PROVIDED, that in no event shall any contribution by a Holder
         hereunder exceed the net proceeds from the offering received by such
         Holder.

                  (e) The obligations of the Company and Holders under this
         Section 2.7 shall survive completion of any offering of Registrable
         Securities in a registration statement and the termination of this
         Agreement. No indemnifying party, in the defense of any such claim or
         litigation, shall, except with the consent of each indemnified party,
         consent to entry of any judgment or enter into any settlement which
         does not include as an unconditional term thereof the giving by the
         claimant or plaintiff to such indemnified party of a complete release
         from all liability in respect to such claim or litigation without any
         admission of guilt or wrongdoing.

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         2.8 ASSIGNMENT OF REGISTRATION RIGHTS. The rights to cause the Company
to register Registrable Securities pursuant to this Section 2 may be assigned by
a Holder to a transferee of Registrable Securities that is: (a) the estate of
such Holder, or the spouse, siblings or lineal descendants of such Holder, or
such Holder's spouse's siblings or lineal descendants or trusts for the benefit
of any of the foregoing; (b) a stockholder, partner, retired partner who retires
after the date hereof, limited partner, retired limited partner who retires
after the date hereof, member, or retired member who retires after the date
hereof of such Holder; (c) a corporation, partnership, limited liability
company, joint venture, trust or individual who or which, directly or indirectly
through one or more intermediaries, is controlled by or under common control
with such Holder or which controls, directly or indirectly through one or more
intermediaries, such Holder; (d) a trust for the benefit of, or partnership,
corporation, limited liability company or other entity owned or controlled by,
any of the foregoing; or (e) any other transferee of all, but not less than all,
of such Holder's Registrable Securities; PROVIDED, HOWEVER, (i) the transferor
shall, within ten (10) days after such transfer, furnish to the Company written
notice of the name and address of such transferee or assignee and the securities
with respect to which such registration rights are being assigned and (ii) such
transferee shall agree to become a party to and be subject to all restrictions
set forth in this Agreement. For purposes of this Section 2.8, the terms
"CONTROL", "CONTROLLED" and "COMMON CONTROL WITH" mean the ability, whether by
the direct or indirect ownership of voting securities or other equity interest,
by contract or otherwise, to elect a majority of the directors of a corporation,
to select the managing or general partner of a partnership or limited
partnership, respectively, or otherwise to select a majority of those persons
exercising governing authority over an entity. Notwithstanding the foregoing and
for the avoidance of doubt, a pledge, collateral assignment or other similar
arrangement shall not be restricted under this Agreement in any manner and
neither the Holder nor the secured party (or creditor) party to such pledge,
collateral assignment or other similar arrangement shall be required to comply
with the provisions of the immediately preceding proviso in the absence of a
foreclosure or other realization of collateral with respect to such pledge,
collateral assignment or other similar arrangement.

         2.9 RULE 144 REPORTING. With a view to making available the benefits of
certain rules and regulations of the Commission which may at any time permit the
sale of the Registrable Securities to the public without registration, at all
times the Company agrees to:

         (a) make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act;

         (b) use its best efforts to file with the Commission in a timely manner
all reports and other documents required of the Company under the Securities Act
and the Exchange Act; and

         (c) furnish to each Holder promptly upon request a written statement by
the Company as to its compliance with the reporting requirements of such Rule
144 and of the Securities Act and the Exchange Act, a copy of the most recent
annual or quarterly report of the Company, and such other reports and documents
so filed by the Company as such holder may reasonably request in availing itself
of any rule or regulation of the Commission allowing such holder to sell any
Registrable Securities without registration.

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         2.10 REPRESENTATION AND WARRANTIES OF THE COMPANY. The Company
represents and warrants as follows:

         (a) The execution, delivery and performance of this Agreement by the
Company have been duly authorized by; all requisite corporate action and will
not violate any provision of law, any order of any court or other agency of
government, Certificate of Incorporation of the Company or By-laws of the
Company or any provision of any indenture, agreement or other instrument to
which it or any of its properties or assets is bound, conflict with, result in a
breach of or constitute (with due notice or lapse of time or both) a default
under any such indenture, agreement or other instrument or result in the
creation or imposition of any lien, charge or encumbrance of any nature
whatsoever upon any of the properties or assets of the Company.

         (b) This Agreement has been duly executed and delivered by the Company
and constitutes the legal, valid and binding obligation of the Company,
enforceable in accordance with its terms except as enforceability may be limited
by bankruptcy, insolvency, reorganization, moratorium or other similar laws
affecting the enforcement of creditors' rights in general and subject to general
principles of equity (regardless of whether such enforceability is considered in
a proceeding in equity or at law) and except as the provisions of Section 2.7
may be deemed to conflict with public policy.

SECTION 3. MISCELLANEOUS

         3.1 GOVERNING LAW. This Agreement shall be governed by and construed
under the laws of the State of Delaware as applied to agreements among Delaware
residents entered into and to be performed entirely within Delaware.

         3.2 SUCCESSORS AND ASSIGNS. Except as otherwise expressly provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successors, assigns, heirs, executors, and administrators of the
parties hereto; provided, however, that prior to the receipt by the Company of
written notice of the transfer of any Registrable Securities specifying the full
name and address of the transferee, the Company may deem and treat the person
listed as the holder of such shares in its records as the absolute owner and
holder of such shares for all purposes, including the payment of dividends or
any redemption price.

         3.3 ENTIRE AGREEMENT. This Agreement (together with the Merger
Agreement) constitutes the full and entire understanding and agreement between
the parties with regard to the subjects hereof and no party shall be liable or
bound to any other in any manner by any representations, warranties, covenants
and agreements except as specifically set forth herein and therein.

         3.4 SEVERABILITY. In case any provision of the Agreement shall be
invalid, illegal, or unenforceable, the validity, legality, and enforceability
of the remaining provisions shall not in any way be affected or impaired
thereby.

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         3.5 AMENDMENT AND WAIVER.

                  (a) This Agreement may be amended or modified only upon the
         written consent of the Company and the Holders of at least two-thirds
         (66 2/3%) of the Registrable Securities.

                  (b) The obligations of the Company and the rights of the
         Holders under this Agreement may be waived only with the written
         consent of the Holders of at least sixty-six and two-thirds percent
         (66 2/3%) of the Registrable Securities.

         3.6 DELAYS OR OMISSIONS. It is agreed that no delay or omission to
exercise any right, power, or remedy accruing to any Holder, upon any breach,
default or noncompliance of the Company under this Agreement shall impair any
such right, power, or remedy, nor shall it be construed to be a waiver of any
such breach, default or noncompliance, or any acquiescence therein, or of any
similar breach, default or noncompliance thereafter occurring. It is further
agreed that any waiver, permit, consent, or approval of any kind or character on
any Holder's part of any breach, default or noncompliance under the Agreement or
any waiver on such Holder's part of any provisions or conditions of this
Agreement must be in writing and shall be effective only to the extent
specifically set forth in such writing. All remedies, either under this
Agreement, by law, or otherwise afforded to Holders, shall be cumulative and not
alternative.

         3.7 NOTICES. All notices required or permitted hereunder shall be in
writing and shall be deemed effectively given: (a) upon personal delivery to the
party to be notified, (b) when sent by confirmed facsimile if sent during normal
business hours of the recipient; if not, then on the next business day, (c) five
(5) days after having been sent by registered or certified mail, return receipt
requested, postage prepaid, or (d) one (1) day after deposit with a nationally
recognized overnight courier, specifying next day delivery, with written
verification of receipt. All communications shall be sent to the party to be
notified at the address or facsimile number as set forth on the signature pages
hereof or at such other address or facsimile number as such party may designate
by ten (10) days advance written notice to the other parties hereto.

         3.8 TITLES AND SUBTITLES. The titles of the sections and subsections of
this Agreement are for convenience of reference only and are not to be
considered in construing this Agreement.

         3.9 COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

         3.10 AGGREGATION OF STOCK. All of the Registrable Securities held or
acquired by affiliated entities or persons shall be aggregated together for the
purpose of determining the availability of any rights under this Agreement.

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         IN WITNESS WHEREOF, the parties hereto have executed this REGISTRATION
RIGHTS AGREEMENT as of the date set forth in the first paragraph hereof.

                                                   STOCKHOLDERS:

ANDREW CORPORATION                          PEQUOT PRIVATE EQUITY FUND III, L.P.

                                            By: Pequot Capital Management, Inc.,
  By: /s/ F. L. ENGLISH                         its Investment Manager
  Title:  Chairman and CEO

Address:  10500 West 153rd Street           By: /s/ KEVIN E. O'BRIEN
          Orland Park, Illinois  60462      Name:  Kevin E. O'Brien
          Attention:  Floyd L. English      Title: General Counsel
          Telephone:  708-349-3300
          Telecopy:  708-349-5294           Address: c/o Carol Holley
                                                         Amber Tencic
                                                         Pequot Capital
                                                           Management, Inc.
                                                         500 Nyala Farm Road
                                                         Westport, CT 06880
                                                         Fax: 203-291-5563

                                            PEQUOT OFFSHORE PRIVATE EQUITY
                                            PARTNERS III, L.P.

                                            By: Pequot Capital Management, Inc.,
                                                its Investment Manager

                                            By: /s/ KEVIN E. O'BRIEN
                                            Name:  Kevin E. O'Brien
                                            Title: General Counsel

                                            Address: c/o Carol Holley
                                                         Amber Tencic
                                                         Pequot Capital
                                                           Management, Inc.
                                                         500 Nyala Farm Road
                                                         Westport, CT 06880
                                                         Fax: 203-291-5563

                                           PEQUOT ENDOWMENT FUND, L.P.

                                       11
<Page>

                                            By: Pequot Capital Management, Inc.,
                                                its Investment Manager

                                            By: /s/ KEVIN E. O'BRIEN
                                            Name:  Kevin E. O'Brien
                                            Title: General Counsel

                                            Address: c/o Carol Holley
                                                         Amber Tencic
                                                         Pequot Capital
                                                           Management, Inc.
                                                         500 Nyala Farm Road
                                                         Westport, CT 06880
                                                         Fax: 203-291-5563

                                            NV PARTNERS II LP

                                            By: New Venture Partners LLC,
                                                its General Partner

                                            By: /s/ ANDREW R. GARMAN
                                            Name:  Andrew R. Garman
                                            Title: Managing Partner

                                            Address: c/o Andrew Garman
                                                         Dror Futter
                                                         New Venture
                                                          Partners LLC
                                                         98 Floral Avenue
                                                         Murray Hill, NJ  07974
                                                         Fax: 908-464-8129

                                            JOHN J. MACK

                                               /s/ JOHN J. MACK
                                            ------------------------------------
                                                   John J. Mack

                                            Address: c/o Credit Suisse First
                                                     Boston
                                                         11 Madison Avenue
                                                         New York, NY 10010
                                                         Fax: 212-325-1425

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EXHIBIT 10.26    
  

 
 

EMPLOYMENT AGREEMENT DATED APRIL 24, 2002 BETWEEN
  VIA NET.WORKS, INC. AND MATT S. NYDELL    
  

        This Employment Agreement (the "Agreement") is being entered into between VIA NET.WORKS, Inc. ("VIA") and Matt S. Nydell (the "Executive"). For and in
consideration of the mutual promises contained herein, and for other good and sufficient consideration, receipt of which is hereby acknowledged, VIA and Executive (sometimes hereafter referred to as
the "parties") agree as follows: 

        1.    Employment and Duties.    VIA agrees to continue employing Executive, and Executive accepts continued employment
with VIA, upon the terms set forth in this Agreement. Executive shall serve as the Senior Vice President, General Counsel and Secretary of VIA and shall perform such duties as are customarily
performed by persons with similar positions in similar companies and shall report to VIA's Chief Executive Officer and Board of Directors. Executive shall discharge his responsibilities and in all
other respects shall serve VIA faithfully and to the best of his ability. 

        2.    Term; At Will Employment Status.    Executive's employment with VIA shall continue indefinitely until terminated
by either party in accordance with Paragraph 4 below. VIA and Executive agree that Executive's employment with VIA shall and at all times be "at will." Executive's employment may be terminated
unilaterally by either party at any time for any reason, with or without Cause or Good Reason and with or without notice. 

        3.    Compensation and Benefits.    

        (a)    Salary.    During Executive's employment, VIA shall pay Executive an annual base salary of not less than
$225,000 ("Base Salary"). Executive's Base Salary shall be paid in accordance with VIA's usual
payroll practices and policies and shall be less standard deductions for federal, state, and local taxes. Executive shall be eligible for merit increases and increases relating to promotions in
accordance with past practice. 

        (b)    Benefits.    During Executive's employment, Executive shall be eligible for all benefits provided to other VIA
executive employees, provided that Executive qualifies for such benefits. Any and all benefits offered by VIA may be supplemented, discontinued, or changed from time to time at VIA's sole discretion. 

        (c)    Bonus.    In addition to his ongoing eligibility for bonuses under the senior executive bonus plan applicable
to VIA senior executives, Executive will be able to participate, in any additional awards, enhancements, or increases in value that may be implemented by VIA's Compensation Committee relating to VIA's
incentive and equity compensation plans. 

        4.    Termination.    Executive's employment under this Agreement shall terminate upon occurrence of any of the
following: 

        (a)    By VIA.    

          (i)  VIA
may terminate Executive's employment at any time for any reason, with or without Cause and with or without notice. If VIA terminates Executive's employment without
Cause, then Executive is entitled to the Severance set forth in Paragraph 5 below. If VIA terminates his employment with Cause, he shall not be entitled to any severance, but he shall be
entitled to a payment of all accrued but unused vacation. 

        (ii)  As
used herein, "Cause" shall mean (aa) the commission of a felony or a crime involving moral turpitude; (bb) gross negligence or willful misconduct with
respect to VIA or any of its affiliates; (cc) a material breach of this Agreement by Executive that is not 

33

 

corrected within five (5) days after Employee receives written notice of such breach; (dd) the failure of Executive, within ten (10) days after receipt by Executive of written
notice thereof from VIA, to comply with proper and lawful instructions, within the scope of Executive's duties, or to take, or fail to take, any action, within the scope of Executive's duties, which
does or which may materially or adversely affect VIA's business or operations; or (ee) harassment or discrimination against VIA's employees, customers or vendors in violation of VIA's policies. 

        (b)    By Executive.    

          (i)  Executive
may terminate his employment at any time for any reason, with or without Good Reason and with or without notice. If Executive terminates his employment with
Good Reason at any time, or if he terminates his employment after October 31, 2002 without Good Reason, then Executive is entitled to the Severance set forth in Paragraph 5 below. If
Executive terminates his employment without Good Reason prior to November 1, 2002, he shall not be entitled to any Severance set forth in Paragraph 5 below, but he shall be entitled to a
payment of all accrued but unused vacation. 

        (ii)  As
used herein, "Good Reason" shall mean: (aa) a geographical relocation of Executive without his consent more than thirty-five (35) miles
from his work location, unless as part of such relocation, VIA offers Executive a competitive relocation or executive expatriate package, as determined
by Spencer Stuart Management Consultants for a period of no less than 12 months; (bb) a material change in Executive's duties, role, reporting relationship or responsibilities;
(cc) a reduction in VIA's annualized revenues below $50,000,000, or the approval by VIA's stockholders of the liquidation or dissolution of the Company; (dd) a material breach of this
Agreement by VIA which is not corrected within five (5) days after VIA receives written notice of such breach; or (ee) a change of control. As used herein, "change of control" shall mean
VIA's stockholders' approving a merger, consolidation, reorganization, recapitalization, exchange offer, acquisition, or disposition of assets or any other transaction or series of transactions
(whether or not pursuant to a stockholder vote) after the consummation of which any person, entity or group (within the meaning of section 13(d) or 14(d) of the Securities Exchange Act of 1934,
as amended (the "Exchange Act")) would become the beneficial owner (within the meaning of Rule 13d-3 promulgated under the Exchange Act), directly or indirectly, of 50% or more of
the outstanding shares of VIA's common stock or 50% or more of the combined voting power of VIA's then outstanding securities (determined under paragraph (d) of Rule 13d-3
promulgated under the Exchange Act, in the case of rights to acquire common stock or other securities). 

        5.    Severance.    Executive's Severance, if any, shall consist of the following: 

        (a)    Payment.    VIA shall pay Executive an amount equal to one year of his Base Salary in effect at the time of his
termination. This payment shall be made no later than five (5) days after the date of Executive's termination of employment and shall be reduced by standard deductions for federal, state, and
local taxes as determined by VIA. 

        (b)    Insurance.    For a period of one year following the date of his termination of employment, VIA shall continue
to provide Executive with health and dental insurance, life insurance, accidental death and disability insurance, and long- and short-term disability insurance on the same
terms as such insurance was provided to him during his employment (which may include his continuing to pay a portion of the premiums for such insurance), provided that such continuation is allowed
under VIA's then-applicable benefit plans. To the extent that continuation is not allowed or is not practicable, VIA shall instead pay to Executive, no later than five (5) days
after the date of Executive's termination of employment, a lump sum payment, less applicable withholdings, equal to twelve months' premiums for COBRA continuation coverage plus twelve 

34

 

months' premiums under VIA's life insurance policy and disability insurance coverage then-applicable to Executive. 

        (c)    Bonus.    With respect to the bonus for the calendar year in which Executive's employment is terminated, VIA
shall pay Executive a pro rata portion (equal to the length of his employment during the calendar year) of the product of his Base Salary at time of his termination and Percentage. As used herein,
Percentage shall equal the sum of the bonuses paid with respect to the two (2) calendar years prior to the calendar year in which his termination occurs divided by the sum of his Base Salary
for each of those two years. Such bonus shall be paid in a lump sum, subject to applicable withholdings, no later than five (5) days after the date of Executive's termination of employment. 

        (d)    Stock Options.    Executive and VIA acknowledge that VIA has granted Executive, under VIA's 1998 Stock Option
and Restricted Stock Plan (as amended), a number of separate options to purchase a number of shares of common stock ("Option Grants"). The parties agree that Executive's Option Grants shall be deemed
immediately and fully vested as of the date of the termination of his employment, and that the exercise period for such Option Grants, at the exercise price(s) provided therein, shall be extended
through the date that is one (1) year from the date of Executive's termination, and such Option Grants shall not be subject to any restrictions limiting Executive's ability to compete with VIA;
provided that this sentence shall not apply if Executive terminates his employment after October 31, 2002 without Good Reason. The parties agree that the terms of this Paragraph 5(d)
(only if Executive becomes entitled to Severance) shall constitute amendments to any and all Incentive Stock Option Agreements ("ISO Agreements") that have been previously agreed to by the parties and
that, except as amended by this Agreement, the terms and conditions of the ISO Agreements shall remain in full force and effect. 

        (e)    Excise Tax Restoration Payment.    In the event that it is determined that any payment, benefit, or
distribution made by VIA, by any of its affiliates, by any person who acquires ownership or effective control or ownership of a substantial portion of VIA's assets (within the meaning of
section 280G of the Internal Revenue Code of 1986, as amended, and the regulations thereunder (the "Code")) or by any affiliate of such person, whether paid or payable or distributed or
distributable pursuant to the terms of this Paragraph 5 or otherwise (the "Total Payments"), would be subject to the excise tax imposed by section 4999 of the Code (or any similar excise
tax or penalty) or any interest or penalties with respect to such excise tax (such excise tax, together with any such interest or penalties, are collectively referred to as the "Excise Tax"), then the
Executive shall be entitled to receive an additional payment (an "Excise Tax Restoration Payment") in an amount that shall fund the payment by the Executive of any Excise Tax on the Total Payments as
well as all income taxes imposed on the Excise Tax Restoration Payment, any Excise Tax imposed on the Excise Tax Restoration Payment and any interest or penalties imposed with respect to taxes on the
Excise Tax Restoration Payment or any Excise Tax, such that the Executive shall have no out-of-pocket costs as a result of the Excise Tax or the Excise Tax Restoration Payment. 

        The
parties acknowledge and agree that payment of any severance and benefits under this Paragraph 5 shall be contingent upon the Executive signing the Mutual Release of Claims
attached hereto as
Attachment A (the "Release"); provided, that in the event Executive executes the Release, but VIA fails to execute the Release, Executive shall nevertheless be entitled to the severance and benefits
described under this Paragraph 5 and Executive's execution of the Release shall not take effect. 

        6.    Stock Options.    Notwithstanding the foregoing, Executive and VIA acknowledge that VIA granted Executive, under
VIA's 1998 Stock Option and Restricted Stock Plan (as amended), Option Grants. The parties agree that if, during Executive's employment, VIA's stockholders' approve the liquidation or dissolution of
the company, Executive's Option Grants shall be deemed immediately and 

35

 

fully vested as of such date of approval, and that after such date of approval, such Option Grants shall not be subject to any restrictions limiting Executive's ability to compete with VIA. The
parties agree that the terms of this Paragraph 6 (only if such a liquidation or dissolution ever occurs) shall constitute amendments to any and all ISO Agreements that have been previously
agreed to by the parties and that, except as amended by this Agreement, the terms and conditions of the ISO Agreements shall remain in full force and effect. 

        7.    Non-Disclosure of This Agreement.    The parties agree that from and after the date of Executive's
receipt of this Agreement, they will not, directly or indirectly, provide to any person or entity any information that concerns or relates to the negotiation of or circumstances leading to the
execution of this Agreement or to the terms and conditions hereof, provided that Executive may make disclosure hereunder (i) to the extent that
such disclosure is specifically required by law or legal process or as authorized in writing by VIA; (ii) to his tax advisor(s) as may be necessary for the preparation of tax returns or other
reports required by law; (iii) to his attorney(s) as may be necessary to secure advice concerning this Agreement; and (iv) to members of his family, and provided
further that VIA may make disclosure (i) to the extent that such disclosure is specifically required by law or legal process or as authorized in writing by Executive;
(ii) to the members of its Board of Directors, senior management team, and accounting and tax personnel; and (iii) as may be reasonably necessary to negotiate or implement this
Agreement. Executive agrees that prior to his disclosing such information (except disclosures required by law or legal process or as authorized in writing by VIA) he will inform the recipients that
they are bound by the limitations of this Paragraph 7. Notwithstanding the foregoing provisions of this Paragraph 7, if this Agreement is filed as an Exhibit to any
Form 10-K or Form 10-Q, Executive's nondisclosure obligations under this Paragraph 7 shall thereupon terminate. 

        8.    Proprietary and/or Confidential Information.    Executive acknowledges that during his employment with VIA, he
has had and will have access to trade secrets and other confidential and/or proprietary information ("Confidential Information"). Executive agrees that he shall continue to abide and be bound by the
promises and obligations in all confidentiality agreements that he has or may have signed with VIA or its affiliates, including but not limited to the VIA NET.WORKS, INC. Employee
Confidentiality Agreement. In addition, Executive agrees that he will use his utmost diligence to preserve, protect, and prevent the disclosure of such Confidential Information, and that he shall not,
either directly or indirectly, use, misappropriate, disclose or aid any other person in disclosing such Confidential Information. Executive acknowledges that as used in this Agreement, Confidential
Information includes, but is not limited to, all methods, processes, techniques, practices, product designs, pricing information, billing histories, customer requirements, customer lists, employee
lists, salary information, personnel matters, financial data, operating results, plans, contractual relationships, projections for new business opportunities for new or developing business for VIA,
and technological
innovations in any stage of development. "Confidential Information" also includes, but is not limited to, all notes, records, software, drawings, handbooks, manuals, policies, contracts, memoranda,
sales files, or any other documents generated or compiled by any employee of VIA. Such information is, and shall remain, the exclusive property of VIA, and Executive agrees that he shall promptly
return all such information to VIA upon the termination of his employment. 

        9.    Return of Property.    Executive agrees that upon the termination of his employment for any reason, he will
deliver to VIA the originals and all copies of all files, documents, papers, materials and other property of VIA or its affiliates relating to their affairs, which may then be in his possession or
under his control. Executive may retain only personal correspondence and notes relating to the duties and responsibilities of his employment. 

        10.    Binding Agreement.    This Agreement shall be binding upon and inure to the benefit of the parties and their
respective representatives, successors and assigns, and Executive's heirs, executors and administrators. 

36

 

        11.    Entire Agreement; Amendment.    This Agreement contains the entire agreement between the parties relating to
the subject matter of this Agreement, and the parties expressly agree that this Agreement supersedes any employment or consulting contract Executive has or may have with VIA and any other Agreement
between Executive and VIA, including without limitation any VIA stock plan. Each party acknowledges and agrees that in executing this Agreement they do not rely upon any oral representations or
statements made by the other party or the other party's agents, representatives or attorneys with regard to the subject matter of this Agreement. This Agreement may not be altered or amended except by
an instrument in writing signed by both parties hereto. 

        12.    Breach or Violation.    Executive acknowledges that any breach of this Agreement (including without limitation
any breach of Paragraphs 1, 7, and 8) would cause VIA substantial irreparable injury. Executive agrees that in the event of any violation of this Agreement, in addition to any damages allowed
by law, VIA shall be entitled to injunctive and/or other equitable relief. 

        13.    Governing Law.    This Agreement shall be governed by, and construed in accordance with, the laws of the
Commonwealth of Virginia (excluding the choice of law rules thereof). The language of all parts of this Agreement shall in all cases be construed as a whole, according to its fair meaning, and not
strictly for or against any of the parties. 

        14.    Waiver.    Neither the waiver by either party of a breach of or default under any of the provisions of the
Agreement, nor the failure of such party, on one or more occasions, to enforce any of the provisions of the Agreement or to exercise any right or privilege hereunder shall thereafter be
construed as a waiver of any subsequent breach or default of a similar nature, or as a waiver of any provisions, rights or privileges hereunder. 

        15.    Assignment.    This Agreement and the rights and obligations of the parties hereunder may not be assigned by
either party without the prior written consent of the other party. 

        IN
WITNESS HEREOF, THE PARTIES HAVE AFFIXED THEIR SIGNATURES BELOW: 

	MATT S. NYDELL	 	VIA NET.WORKS, INC.

12100 Sunset Hills Road, Suite 110

Reston, Virginia 20190
	

/s/  MATT S. NYDELL      
	
 	

By:	

/s/  KARL MAIER      
 Karl Maier
 Chief Executive Officer
	

Date:	

    April 24, 2002
	
 	

 	

Date:	

    April 24, 2002

	

Witness:	

    
	
 	

 	

Witness:	

    

37

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EXHIBIT 10.26

EMPLOYMENT AGREEMENT DATED APRIL 24, 2002 BETWEEN VIA NET.WORKS, INC. AND MATT S. NYDELL

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