FOURTH AMENDMENT TO
                    FIFTH AMENDED AND RESTATED LOAN AGREEMENT

         This is the fourth amendment (the "Amendment") dated as of March 27,
2001, to the Fifth Amended And Restated Loan Agreement dated November 12, 1999
as amended by the first amendment dated March 24, 2000, the second amendment
dated as of August 11, 2000, and the third amendment dated February 15, 2001
(the "Loan Agreement") by and between Blonder Tongue Laboratories, Inc. having
an office at One Jake Brown Road, Old Bridge, New Jersey 08857 (the "Borrower"),
and First Union National Bank having an office at 190 River Road, Summit, New
Jersey 07901 (the "Bank").

                                    RECITALS

     A.  Borrower  has  requested  an  amendment   modifying  certain  financial
covenants and extending the "Termination Date" of the Loan Agreement to November
30, 2001.

     B. The  Bank is  willing  to amend  the Loan  Agreement  on the  terms  and
conditions set forth herein.

     NOW, THEREFORE,  in consideration of the agreement of the parties contained
herein, and intending to be legally bound, the parties hereto agree as follows:

     1. Definitions.
        -----------

     Capitalized  terms used  herein  and not  defined  shall have the  meanings
assigned to them in the Loan Agreement as amended by any prior amendments.

     2. Amendments to Loan Agreement.
        ----------------------------

          a. Section  2.1(a) is hereby  amended to replace "April 30, 2001" with
     "November 30, 2001".

          b.  Section  7.1(b) is hereby  amended,  effective  as of December 31,
     2000, to read as follows:

          "Have a Fixed  Charge  Ratio of less than (i) 1.0 to 1 at December 31,
          1999,  (ii) 1.1 to 1 for March 31,  2000,  (iii) 1.2 to 1 for June 30,
          2000,  (iv) 1.3 to 1 for September 30, 2000, (v) 1.2 to 1 for December
          31,  2000,  and (vi) 0.9 to 1.0 for March 31,  2001  (with no  minimum
          Fixed Charge Ratio being required thereafter). "Fixed Charge Ratio" of
          the Borrower as of the last day of any fiscal  quarter  shall mean the
          ratio of (x) EBITDA of the Borrower for the four fiscal quarter period
          ending on that date, to (y) the sum of (A) interest expense and income
          tax expense for the four fiscal  quarter  period  ending on that date,
          and (B) current  maturities of long term  Indebtedness and obligations
          under  capital  and  operating  leases  for the four  fiscal  quarters
          following such date."
<PAGE>

     3. General.
        -------

     This  Amendment  is made  pursuant to the Loan  Agreement,  and the parties
hereto acknowledge that all provisions of the Loan Agreement,  except as amended
hereby, shall remain in full force and effect.

     4. Definitions.
        -----------

     Whenever  appearing in the Loan Agreement or any other Loan  Document,  the
term "Agreement" shall be deemed to mean the Loan Agreement as amended hereby.
      ---------

     5. Representations and Warranties.
        ------------------------------

     The  Borrower  represents  and  warrants  to the Bank that:  (i) it has the
power, and has taken all necessary action to authorize, execute and deliver this
Amendment and perform its obligations in accordance  with the terms  thereunder,
(ii) the  Amendment is the legal,  valid and binding  obligation of the Borrower
enforceable  against  the  Borrower  in  accordance  with its terms  without any
offsets,   counterclaims  or  defenses,   (iii)  the  execution,   delivery  and
performance  of  this  Amendment  by the  Borrower  will  not  (a)  require  any
governmental approval or any other consent or approval; or (b) violate, conflict
with,  result in a breach of,  constitute a default under any agreement to which
it is a party,  or result in or require the creation of any lien upon any of the
assets of the Company or any  Subsidiary,  (iv) no Event of Default has occurred
and is  continuing  or will result from the  execution  by the  Borrower of this
Amendment,  and (v) the  financial  information  provided by the Borrower to the
Bank in  connection  with the  Borrower's  request that the Bank enter into this
Amendment is true and correct in all material respects.

     6. Audits and Valuations.
        ---------------------

     Without  changing any of the Bank's other rights under the Loan  Agreement,
the Borrower  agrees to cooperate,  and to pay the fees and expenses of the Bank
in connection,  with a collateral  audit to be conducted by Boston & Associates.
Reimbursement  for or payment of any such fees and expenses shall be made within
ten business days  following  presentation  of an invoice to the Borrower by the
Bank.

     7. Amendment Fee.
        -------------

     The Borrower shall pay to the Bank a fee of $35,000 in connection with this
Amendment which fee shall be due and payable upon the signing of this Amendment.

     8. Fees of Bank's Counsel.
        ----------------------

     The  Borrower  shall pay the fees and  expenses  of  McCarter  & English in
connection  with the  preparation  and  negotiation  of this  Amendment  and all
related documents.

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<PAGE>

     9. Conditions to Effectiveness.
        ---------------------------

     It shall be a condition to the  effectiveness  of this  Amendment  that the
Bank has received the following:

          a. This  Amendment,  duly  executed on behalf of the  Borrower and the
     Bank;

          b. A  certificate  from the  Secretary  the  Borrower  (i) to which is
     attached  a copy  of the  Certificate  of  Incorporation  certified  by the
     Secretary  of State of Delaware  and a copy of the By-laws of the  Borrower
     (or a  certification  that  such  documents  have not been  modified  since
     December 11, 1995),  (ii) attesting to  authorization of the person signing
     this Amendment on behalf of the Borrower,  and (iii) setting forth the name
     and sample signature of the officers of the Borrower  authorized to execute
     and deliver this Amendment.

     10. Integration.
         -----------

     This  Amendment  together  with the Loan  Agreement  constitute  the entire
agreement and  understanding  among the parties  relating to the subject  matter
hereof and thereof and supersedes all prior proposals, negotiations,  agreements
and understandings relating to such subject matter.

     11. Severability.
         ------------

     If any provision of this Amendment  shall be held invalid or  unenforceable
in  whole  or in part in any  jurisdiction,  such  provision  shall,  as to such
jurisdiction,  be ineffective to the extent of such invalidity or enforceability
without in any manner affecting the validity or enforceability of such provision
in any other  jurisdiction or the remaining  provisions of this Amendment in any
other jurisdiction.

     12. No Defenses, Off-Sets or Counterclaims.
         --------------------------------------

     By executing this Amendment,  Borrower confirms and acknowledges that as of
the  date  of  execution   hereof,   Borrower  has  no  defenses,   off-sets  or
counterclaims  against any of Borrower's  obligations to the Bank under the Loan
Documents,  including the Loan Agreement (as amended  hereby).  Borrower  hereby
acknowledges  and agrees  that the  actual  amounts  outstanding  on the date of
execution hereof are owing the Bank without defense, offset or counterclaim.

     13. Incorporation by Reference.
         --------------------------

     This Amendment is incorporated by reference into the Loan Agreement and the
other Loan  Documents.  Except as otherwise  provided  herein,  all of the other
provisions  of the Loan  Agreement  and the  other  Loan  Documents  are  hereby
confirmed  and ratified and shall remain in full force and effect as of the date
of this Amendment.

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<PAGE>

     14. Governing Law; Successors and Assigns.
         -------------------------------------

     This  Amendment  is  governed by the laws of the State of New Jersey and is
binding upon the Borrower and the Bank and their  respective  successors  and/or
assigns and/or heirs and executors, as the case may be.

     15. Counterparts.
         ------------

     This  Amendment may be executed by one or more of the parties on any number
of separate  counterparts,  and all of said counterparts taken together shall be
deemed to constitute one and the same instrument.

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Amendment to be
executed by their respective  officers  thereunto duly  authorized,  on the date
first above written.

                                        BLONDER TONGUE LABORATORIES, INC.

                                        By:/s/ James A. Luksch
                                           -------------------------------------
                                           James A. Luksch
                                           Chief Executive Officer and President


                                        FIRST UNION NATIONAL BANK

                                        By:/s/ Larry F. Lee
                                           -------------------------------------
                                           Larry F. Lee
                                           Vice President




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