RADIUS INC
SC 13D, 1997-12-11
COMPUTER PERIPHERAL EQUIPMENT, NEC
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                   Under the Securities Exchange Act of 1934

                                  RADIUS, INC.
- -------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  750470 20 5
- -------------------------------------------------------------------------------
                                 (CUSIP Number)

                              Gerald D. Ellenburg
                          1520 Gulf Blvd., Suite 1406
                              Clearwater, FL 33767
                                 (813) 517-7016
- -------------------------------------------------------------------------------
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                December 2, 1997
- -------------------------------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).



<PAGE>   2



<TABLE>
<S>      <C>      <C>
         1)       Names of Reporting Persons or I.R.S. Identification Nos. of
                  Above Persons: 
                      Gerald D. Ellenburg

         2)       Check the Appropriate Box if a Member of a Group
                      (a) [ ]         (b) [X] 

         3)       SEC Use Only

         4)       Source of Funds
                      00

         5)       Check if Disclosure of Legal Proceedings is Required Pursuant
                  to Items 2(d) or 2(e): [ ]

         6)       Citizenship or Place of Organization
                      United States

Number of         7)  Sole Voting Power
Shares Bene-             -0-
 ficially         8)  Shared Voting Power
Owned by                 1,825,001 (Please refer to Item 5 for disclaimer of beneficial ownership.)
Each Report-      9)  Sole Dispositive Power
ing Person               -0-
   With          10)  Shared Dispositive Power
                         1,825,001 (Please refer to Item 5 for disclaimer of beneficial ownership.)

         11)      Aggregate Amount Beneficially Owned by Each Reporting Person
                         1,825,001 (Please refer to Item 5 for disclaimer of beneficial ownership.)

         12)      Check box if the Aggregate Amount in Row (11) Excludes Certain Shares
                         [X]

         13)      Percent of Class Represented by Amount in Row (11)
                         3.28%

         14)      Type of Reporting Person
                         IN
</TABLE>


                                       2
<PAGE>   3

<TABLE>
<S>      <C>      <C>       
         1)       Names of Reporting Persons or I.R.S. Identification Nos. of Above Persons:
                      Kristin M. Tomczak

         2)       Check the Appropriate Box if a Member of a Group
                      (a) [ ]      (b) [X]

         3)       SEC Use Only

         4)       Source of Funds
                      00

         5)       Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e): [ ]

         6)       Citizenship or Place of Organization
                      United States

Number of         7)  Sole Voting Power
Shares Bene-             -0-
 ficially         8)  Shared Voting Power
Owned by                 1,825,001 (Please refer to Item 5 for disclaimer of beneficial ownership.)
Each Report-      9)  Sole Dispositive Power
ing Person               -0-
   With          10)  Shared Dispositive Power
                         1,825,001 (Please refer to Item 5 for disclaimer of beneficial ownership.)

         11)     Aggregate Amount Beneficially Owned by Each Reporting Person 
                      1,825,001 (Please refer to Item 5 for disclaimer
                      of beneficial ownership.)

         12)      Check box if the Aggregate Amount in Row (11) Excludes Certain Shares
                      [X]

         13)      Percent of Class Represented by Amount in Row (11)
                      3.28%

         14)      Type of Reporting Person
                      IN
</TABLE>

                                       3

<PAGE>   4


Item 1.  Security and Issuer.

                  This Statement relates to the Common Stock, no par value (the
                  "Common Stock"), of Radius, Inc. (the "Company"), a
                  California corporation having its principal executive office
                  at 215 Moffett Park Drive, Sunnyvale, California 94089.

Item 2.  Identity and Background.

                  (a)      The persons filing this Statement are Gerald D.
                           Ellenburg and Kristin M. Tomczak.

                  (b)      Their business address is 1520 Gulf Boulevard, Suite
                           1406, Clearwater, FL 33767.

                  (c)      The present principal occupation and employment of
                           Mr. Ellenburg is self-employed as a real estate
                           owner/investor/general partner.

                           Ms. Tomczak is not employed.

                  (d) and (e) During the last five years, neither Mr. Ellenburg
                           nor Ms. Tomczak nor to their knowledge any number of
                           any group which might be deemed to exist as
                           described in Item 5 have been convicted in a
                           criminal proceeding (excluding traffic violations
                           and similar misdemeanors), nor has either of them
                           been a party to any civil proceeding of a judicial
                           or administrative body of competent jurisdiction as
                           a result of which they were subject to a judgment,
                           decree or final order enjoining future violations
                           of, or prohibiting or mandating activities subject
                           to, federal or state securities laws or finding any
                           violation with respect to those laws.

                  (f)      United States.

Item 3.  Source and Amount of Funds or Other Consideration.

                  The source of the funds used in making the purchase described
                  in this statement was a loan in the principal amount of
                  $1,022,400 from Norton S. Karno, Trustee, a portion of which
                  was used to purchase the shares of Common Stock.

Item 4.  Purpose of Transaction.

                  The purchase of the shares of Common Stock described herein
                  by Mr. Ellenburg and Ms. Tomczak was for investment. Although
                  Mr. Ellenburg and Ms. Tomczak either jointly or individually
                  may acquire additional shares of Common Stock, they have no
                  present plans or proposals which would relate to or result
                  in:

                                       4
<PAGE>   5

                  (a)      An extraordinary corporate transaction, such as a
                           merger, reorganization or liquidation, involving the
                           Company or any of its subsidiaries;

                  (b)      A sale or transfer of a material amount of assets of
                           the Company or any of its subsidiaries;

                  (c)      Any change in the present board of directors or
                           management of the Company, including any plans or
                           proposals to change the number or term of directors
                           or to fill any existing vacancies on the board;

                  (d)      Any material change in the present capitalization or
                           dividend policy of the Company;

                  (e)      Any other material change in the Company's business
                           or corporate structure;

                  (f)      Changes in the issuer's charter, bylaws or
                           instruments corresponding thereto or other actions
                           which may impede the acquisition of control of the
                           Company by any person;

                  (g)      Causing a class of securities of the Company to be
                           delisted from a national securities exchange or to
                           cease to be authorized to be quoted in an
                           inter-dealer quotation system of a registered
                           national securities association;

                  (h)      A class of equity securities of the Company becoming
                           eligible for termination of registration pursuant to
                           Section 12(g)(4) of the Securities Exchange Act of
                           1934; or

                  (i)      Any action similar to any of those enumerated above.

Item 5.  Interest in Securities of the Issuer.

                  As of the date of this Statement, Mr. Ellenburg and Ms.
                  Tomczak beneficially own 1,825,001 shares of Company Common
                  Stock constituting approximately 3.28% of the outstanding
                  shares of Common Stock as of August 12, 1997, based on
                  information provided in the Company's 10-Q filed August 12,
                  1997. This Statement is being filed because Mr. Ellenburg and
                  Ms. Tomczak may be deemed to be part of a "group," as
                  described below.

                  Mr. Ellenburg and Ms. Tomczak purchased 1,800,000 shares (the
                  "Shares") pursuant to an option (the "Option") granted by
                  Mitsubishi Electronics America, Inc. ("Mitsubishi") to Gerald
                  D. Ellenburg or his assigns to purchase a total of 3,999,901
                  shares of Common Stock for a purchase price of $.45 per
                  share. As part of the sale, Mitsubishi also assigned to Mr.
                  Ellenburg and Ms. Tomczak a warrant to purchase 25,001 shares
                  (the "Warrant") of Common Stock. In addition to the Shares
                  purchased by Mr. Ellenburg and Ms. Tomczak and the Warrant

                                       5
<PAGE>   6

                  assigned to Mr. Ellenburg and Ms. Tomczak pursuant to the
                  Option, the following persons purchased shares of Common
                  Stock and, to the extent indicated below, received an
                  assignment of warrants to purchase shares of Common Stock
                  pursuant to the Option. All of such persons, together with
                  Mr. Ellenburg and Ms. Tomczak, may be deemed to constitute a
                  "group" within the meaning of Section 13(d)(3) of the
                  Securities Exchange Act of 1934 because all of their
                  acquisitions of shares of Common Stock were made pursuant to
                  the Option:

<TABLE>
<CAPTION>
                                                                              Number       Total
                                                       Number                   of       Beneficial
                                                      of Shares     Voting   Warrants     Ownership     Percentage
                                 Name                 Acquired      Status   Acquired     Acquired       of Class
                                 ----                 ---------     ------   --------    ----------     ----------
                  <S>                                 <C>           <C>      <C>         <C>            <C>
                  Norton S. Karno, Trustee  of the      600,000      Sole      8,333       608,333         1.09%
                  Stephanie Lynn Karno Adult Trust
                  #2, under Agreement dated
                  December 31, 1969

                  Norton S. Karno, Trustee of the       600,000      Sole      8,333       608,333         1.09%
                  Valerie Ann Karno Adult Trust #2,
                  under Agreement dated December
                  31, 1969

                  Norton S. Karno, Trustee of the       600,000      Sole      8,333       608,333         1.09%
                  Mitchell Perry Karno Adult Trust
                  #2, under Agreement dated
                  December 31, 1969

                  Jurgen W. Epple                       239,941      Sole        0         239,941         0.43%(1)
 
                  Michael D. Edwards                    159,960      Sole        0         159,960         0.29%
</TABLE>
                  ---------------
                  (1) Mr. Epple is also the beneficial owner of 40,000 shares
                      of Common Stock not purchased pursuant to the Option.
                      Accordingly, with the 239,941 shares of Common Stock
                      purchased pursuant to the Options, Mr. Epple is the
                      beneficial owner of 279,941 shares of Common Stock, or
                      0.50% of the class.

                  Mr. Ellenburg and Ms. Tomczak loaned $180,000 to Messrs.
                  Epple and Edwards, the proceeds of which were used by Messrs.
                  Epple and Edwards to acquire 239,941 and 159,960 shares,
                  respectively, of Common Stock pursuant to the Option. Messrs.
                  Epple and Edwards each pledged their shares of Common Stock
                  as collateral for such loan. As a result of the foregoing,
                  under Securities and Exchange Commission Rule 13d-3(d)(3),
                  Mr. Ellenburg and Ms. Tomczak may be deemed to be the
                  beneficial owners of the shares of Common Stock owned by
                  Messrs. Epple and Edwards.

                  Mr. Ellenburg and Ms. Tomczak disclaim beneficial ownership
                  of any shares of Common Stock beneficially owned by Messrs.
                  Karno, Epple and Edwards, and

                                       6
<PAGE>   7

                  the filing of this Statement shall not be construed as an
                  admission that Mr. Ellenburg and Ms. Tomczak are the
                  beneficial owners of such shares.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect
to Securities of the Issuer.

                  As described under Item 5, above, Mr. Ellenburg and Ms.
                  Tomczak loaned funds to Messrs. Epple and Edwards and
                  received a pledge of the shares of Common Stock purchased by
                  Messrs. Epple and Edwards.

                  Mr. Ellenburg and Ms. Tomczak, along with Norton S. Karno,
                  Trustee of the Stephanie Lynn Karno Adult Trust #2, Norton S.
                  Karno, Trustee of the Valerie Ann Karno Adult Trust #2, and
                  Norton S. Karno, Trustee of the Mitchell Perry Karno Adult
                  Trust #2 (collectively, the "Owners") entered into a Finder's
                  Fee Agreement with Messrs. Epple and Edwards (together, the
                  "Finders") pursuant to which the Owners agreed to pay the
                  Finders $64,800 related to the Owners' purchase of shares of
                  Common Stock pursuant to the Option. In addition, Mr.
                  Ellenburg and Ms. Tomczak borrowed from Norton S. Karno,
                  Trustee, $1,022,400, a portion of which was used to acquire
                  the Shares and pledged the Shares as collateral for such
                  loan.

Item 7.  Material to be Filed as Exhibits.

                  The following documents are filed herewith as exhibits to
this Statement:

<TABLE>
                      <S>  <C>
                      1.   Joint Filing Agreement
                      2.   Option to Purchase Shares
                      3.   Limited Recourse Promissory Note Secured by Stock Pledge Agreement
                      4.   Assignment of Warrant
                      5.   Stock Pledge Agreement
                      6.   Promissory Note Secured by Mortgage, Stock Pledge Agreements
                           and Collateral Assignments
                      7.   Stock Pledge Agreement
                      8.   Finder's Fee Agreement
</TABLE>

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Statement is true, complete and
correct.

Date:  December 11, 1997                             /s/ Gerald D. Ellenburg
                                                     -----------------------
                                                     Gerald D. Ellenburg

                                                     /s/ Kristin M. Tomczak
                                                     -----------------------
                                                     Kristin M. Tomczak


                                       7
<PAGE>   8



                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
                            Exhibit                                   Page
                            -------                                   ----
         <S>      <C>                                                 <C>
         1.       Joint Filing Agreement                               ___
         2.       Option to Purchase Shares                            ___
         3.       Limited Recourse Promissory Note                     ___
                  Secured by Stock Pledge Agreement
         4.       Assignment of Warrant                                ___
         5.       Stock Pledge Agreement                               ___
         6.       Promissory Note Secured by Mortgage,                 ___
                  Stock Pledge Agreements and Collateral Assignments
         7.       Stock Pledge Agreement                               ___
         8.       Finder's Fee Agreement                               ___
</TABLE>

<PAGE>   1
                                                           EXHIBITS TO ELLENBURG

                                   EXHIBIT 1





                             JOINT FILING AGREEMENT



         Pursuant to Rule 13d-1 (f) (1) under the Securities Exchange Act of
1934, the undersigned hereby agree that only one statement containing the
information required by Schedule 13D (or any amendment thereof) need be filed
on their behalf with respect to the beneficial ownership of any equity
securities of Radius, Inc. or any subsequent acquisitions or dispositions of
equity securities of Radius, Inc.

Date:    December 11, 1997
                 
                                        /s/ Gerald D. Ellenburg
                                        --------------------------------------
                                        Gerald D. Ellenburg


                                        /s/ Kristin M. Tomczak
                                        --------------------------------------
                                        Kristin M. Tomczak




<PAGE>   1
                                    EXHIBIT 2



Mr. Kazuhiko Hayakawa
President
Information Technologies Group
Mitsubishi Electronics America, Inc.


November 6, 1997


Mitsubishi Electronics Corp. (hereinafter referred to as "Seller") hereby agrees
for the consideration of $100 paid to Seller in care of Mr. Jurgen Epple to sell
exclusively and solely to Gerald D. Ellenburg (hereinafter referred to as
"Buyer") and/or Buyer's assignees, all of Seller's shares of stock in Radius,
Inc. (Nasdaq trading symbol RDUS) for $0.45 per share. Such sale is to be
completed by 5:00 P.M. PST November 14, 1997 by delivery by Buyer of wired funds
or cashier's check (if wired, a confirmation of wire is acceptable to Seller if
received on the business day following November 14, 1997 if such confirmation
states that wire was funded by Buyer on November 14, 1997).

Seller represents that it owns and will sell to Buyer 3,999,901 (three million
nine hundred ninety-nine thousand nine hundred and one) shares pursuant to the
Registration Statement dated January 16, 1997, which shares will be unrestricted
and freely tradable upon transfer to Buyer as specified in the governing
agreement, free of lien or encumbrance. Seller agrees to sell and transfer to
Buyer, at sale, any and all rights and claims it has against Radius, Inc. and
any of its former or present directors, officers, agents, or employees as a
shareholder of Radius, Inc.

Buyer and Seller agree that a fax and countersigned copy of this agreement is
fully enforceable.

By:   Mr. Kazuhiko Hayakawa                       By:    Gerald D. Ellenburg
      President
      Information Technologies Group
      Mitsubishi Electronics America, Inc.

      /s/ Kazuhiko Hayakawa                       /s/ Gerald D. Ellenburg
      ------------------------------------        ------------------------------
                                                     Gerald D. Ellenburg


<PAGE>   1

                                  EXHIBIT 3


                    LIMITED RECOURSE PROMISSORY NOTE SECURED
                           BY STOCK PLEDGED AGREEMENT


$180,000                      Clearwater, Florida             November 28, 1997


         FOR VALUABLE CONSIDERATION, the receipt and adequacy of which are
hereby acknowledged, JURGEN EPPLE and MICHAEL EDWARDS (collectively, "Makers"),
jointly and severally promise to pay to GERALD D. ELLENBURG and KRISTIN MARY
TOMCZAK (collectively, "Payees"), or order, at 1520 Gulf Boulevard, Suite 1406,
Clearwater, Florida 33767, or at such other address as Payees may, from time to
time, designate, the sum of One Hundred Eighty Thousand Dollars ($180,000) with
interest on the unpaid balance outstanding from time to time, subject to the
provisions of Paragraph 2, at the rate described below.

         1.      Definitions.
                 a.       Funding Date.  The "Funding Date" shall be December
1, 1997.

                 b.       Maturity Date.  The "Maturity Date" shall be November
30, 2002.

                 c.       Payees.  As used herein, the term "Payees" shall
include the herein named Payees and all of said Payees' heirs, successors and
assigns and shall mean the person(s) and/or entity(ies) holding the Payees'
interest in this Note at any time.

         2.      Interest Rate.  Commencing with the Funding Date and
continuing until fully paid, the unpaid principal balance of this Note shall
bear interest at the rate of twelve percent (12%) per annum.  Interest not paid
when due shall be added to principal on its due date, without notice to Makers,
and without any grace period, and shall thereafter bear interest.

         3.      Payments.

                 a.       Annual Interest Payments.  Payments of interest then
accrued shall be due on each anniversary of the Funding Date commencing with
December 1, 1998.  Any such installment of interest not paid when due shall be
added to principal and thereupon bear interest.

                 b.       Proceeds of Sale of Radius Stock.  Upon Makers' sale
or transfer of all or any portion of their stock in Radius, Inc., a California
corporation, or any interest therein, or any rights thereto, including but not
limited to any proceeds of any sale of any call option with respect thereto
(collectively, a "Sale"), Makers shall cause the entire net proceeds of such
Sale (up to the total amount of then accrued but unpaid interest and principal
owed upon this Note) to be paid to Payee and Payee shall apply same, upon
receipt, (i) first to any cost or expense 



<PAGE>   2

incurred by Payees in collecting same from Makers (including but not limited to
any attorneys fees or other costs incurred in enforcing Payees' rights
hereunder, (ii) then to past-due, accrued but unpaid interest, (iii) then to
the interest accrued but unpaid since the last regularly scheduled payment date
pursuant to Paragraph 2 above, and (iv) then to principal.  As used herein, the
"net proceeds" of a Sale means all proceeds of such Sale reduced only by all
direct selling expenses incurred and paid, at the time of the closing of such
Sale, to persons or entities not related to, or affiliated with, Makers or
either of them, directly or indirectly, including but not limited to brokerage
commissions and registration expenses. 

                 c.       Payment from Finders' Fees.  Upon Makers' receipt 
of the finders' fees with respect to the purchase of Radius, Inc. stock by
Payees and/or by Norton S. Karno as Trustee of the Stephanie Lynn Karno Adult
Trust #2, and/or by Norton S. Karno as Trustee of the Valerie Ann Karno Adult
Trust #2, and/or by Norton S. Karno as Trustee of the Mitchell Perry Karno
Adult Trust #2, becoming due and payable one year after the Funding Date or
thereafter, to Makers or to any entity affiliated with Makers or either of
them, including but not limited to Matrix Capital, or to any assignee or
successor in interest of Makers or any entity affiliated with Makers or either
of them, including but not limited to Matrix Capital, Makers shall concurrently
pay an amount equal to such finders' fees then paid to Payees (up to the total
amount of then accrued but unpaid interest and principal owed upon this Note),
and Payees shall apply such payment (i) first to any cost or expense incurred
by Payees in collecting same from Makers (including but not limited to any
attorneys fees or other costs incurred in enforcing Payees' rights hereunder),
(ii) then to past-due, accrued but unpaid interest, (iii) then to the interest
accrued but unpaid since the last regularly scheduled payment date pursuant to
Paragraph 2 above, and (iv) then to principal.

                 d.       Payment Upon Appreciation in Value.  Makers agree to
pay the entire unpaid balance hereof, together with all then accrued but unpaid
interest thereon at any time that 100,000 shares of Radius, Inc. Stock could
have been sold for $1.80 or more per share, as evidenced by the actual daily
trading volume of Radius, Inc. shares at or above $1.80 per share.  The actual
daily trading volume conclusively constituting such evidence shall be any five
consecutive trading sessions.  Such payment shall be made within four weeks
after demand therefor by Payees; Payees agree to escrow Radius, Inc.'s shares
pledged pursuant to the Stock Pledge Agreement described in paragraph 5 below
with a transfer agent, broker or escrow agent to facilitate Makers' Sale or
margin transaction with respect to such shares required to make such payment on
terms reasonably satisfactory to Payees and which assure that the security
interest of Payees in said shares is preserved.

                 e.       Final Principal Payment.  On the Maturity Date,
Makers shall pay Payees the entire unpaid principal balance hereof, together
with all then accrued but unpaid interest thereon.

         4.      Prepayment.  Makers may prepay the indebtedness evidenced
hereby, in whole or in part, at any time.



                                      2
<PAGE>   3

         5.      Security.  This Note is secured by a first priority Stock
Pledge Agreement executed by Makers pledging all of their stock of Radius, Inc.
(referred to herein as the "Stock Pledge Agreement").

         6.      Events of Default and Remedies.

                 a.       Any one of the following occurrences shall constitute
an "Event of Default" under this Note:

                          i.      Makers' failure to pay any installment of
         interest, principal or interest and principal on the date due of such
         payment;

                          ii.     Makers' breach of any of their other
         covenants and agreements hereunder; or

                          iii.    The occurrence of any Event of Default or
         material breach under the Stock Pledge Agreement.

                 b.       Upon the occurrence of any Event of Default under
this Note:

                          i.      The entire unpaid principal balance, any
         accrued but unpaid interest and all other amounts owing under this
         Note and all other sums owing under the Stock Pledge Agreement shall,
         at the option of Payees of this Note and without notice or demand of
         any kind to Makers or any other person, immediately become due and
         payable; and

                          ii.     Payees shall have and may exercise any and
         all rights and remedies available at law or in equity and also any and
         all rights and remedies provided in the Stock Pledge Agreement.

                 The remedies of Payees, as provided in this Note and in the
Stock Pledge Agreement, shall be cumulative and concurrent and may be exercised
singularly, successively or together, at the sole discretion of Payees, and may
be exercised as often as occasion therefor shall arise.  No act or omission or
commission of Payees, including specifically any failure to exercise any right,
remedy or recourse, shall be deemed to be a waiver or release of any right,
remedy or recourse, such waiver or release to be effected only through a
written document executed by Payees.  A waiver or release with reference to any
one event shall not be construed as continuing, as a bar to, or as a waiver or
release of, any subsequent right, remedy or recourse as to a subsequent event.

         7.      Legal Limits.  All agreements between Makers and Payees are
hereby expressly limited so that in no event whatsoever, whether by reason of
deferment in accordance with this Note or under any agreement or by virtue of
acceleration or maturity of the indebtedness evidenced hereby, or otherwise,
shall the amount paid or agreed to be paid to the Payees hereof, for the loan,
use, forbearance, or detention of the money to be loaned under this Note or to
compensate Payees for damages to be suffered by reason of a late payment or
default under this 



                                      3

<PAGE>   4

Note exceed the maximum permissible under applicable law. If, for any
circumstances whatsoever, fulfillment of any provisions of this Note or any
provision in the Stock Pledge Agreement at the time the performance of such
provision shall be due, shall involve exceeding the limit of validity
prescribed by law, ipso facto, the obligations to be fulfilled shall be reduced
to the limit of such validity.  This provision shall never be superseded or
waived and shall control every other provision of all agreements among Makers
and Payees.

         8.      Limited Recourse.  Makers shall be personally liable for the
principal balance hereof only to the extent the sums recovered by Payees
pursuant to the Stock Pledge Agreement and any foreclosure thereunder is less
than the sum of (a) Ninety Thousand Dollars ($90,000) and all accrued but
unpaid interest then owed hereunder.  By way of example, in the event Makers
default hereunder, if Payees realize, pursuant to a foreclosure sale of all of
Makers' stock in Radius, Inc. under the Stock Pledge Agreement, net of the
foreclosure costs (including attorneys fees pursuant to paragraph 9 below), the
sum of One Hundred Twenty Thousand Dollars ($120,000), and if at the date of
such foreclosure sale, there is accrued but unpaid interest of Twenty-Two
Thousand Dollars ($22,000) owed upon this Note, then Makers shall have no
further obligation or indebtedness to Payees.  By way of further example, if
Payees realize, pursuant to a foreclosure sale of all of Makers' stock in
Radius, Inc. under the Stock Pledge Agreement, net of the foreclosure costs,
the sum of One Hundred Thousand Dollars ($100,000), and if at the date of such
foreclosure sale, there is accrued but unpaid interest of Twenty-Two Thousand
Dollars ($22,000) owed upon this Note, then such proceeds would be applied
first to the accrued interest, and the remainder ($78,000) to principal and
Makers would remain personally liable to Payees for Twelve Thousand Dollars
($12,000).

         9.      Attorneys' Fees.  Should an Event of Default occur under this
Note, Makers agree to pay a reasonable sum to Payee for attorneys' fees
incurred in collecting the sums due hereunder and enforcing the rights and
remedies of Payee under this Note and under the Stock Pledge Agreement.  If any
action is brought to enforce or interpret the provisions of this Note, the
prevailing party shall be entitled to a reasonable sum for attorneys' fees.

         10.     Governing Law and Severability.  This Note and the Stock
Pledge Agreement are made pursuant to and shall be construed and governed by
the laws of the State of Florida (which is the state in which Makers maintain
their principal residence) and all rules and regulations promulgated
thereunder.  If any provision of this Note or of the Stock Pledge Agreement is
construed or interpreted by a court of competent jurisdiction to be void,
invalid or unenforceable, such decision shall affect only those provisions so
construed or interpreted and shall not affect the remaining provisions of this
Note or of the Stock Pledge Agreement.

         11.     Time of Essence.  Time is of the essence of this Note.

         12.     Payment Without Offset.  Principal and interest shall be paid
without deduction or offset in lawful money of the United States of America.

         13.     Notices.  Any notice, report or writing required or permitted
to be given hereunder shall be in writing and shall be served by delivering the
same personally either to the other party, or by depositing the notice,
contained in a sealed envelope, postage prepaid, in any mailbox 



                                      4

<PAGE>   5

maintained by the United States Postal System for the purpose of depositing
mail into said System, as registered or certified mail, with return receipt
requested or by Express Mail, certified with return receipt requested.  Any and
all such notices shall be delivered to the parties at their respective
addresses specified in this paragraph.  Any such notice deposited in the mail
shall be conclusively deemed delivered to and received by the addressee three
(3) business days after the deposit in the mail as first class mail, or one (1)
business day after deposit in the mail as Express Mail, if all of the foregoing
conditions of notice shall have been satisfied and if such notice shall at the
time of mailing have been contained in an envelope addressed as follows:

         To Payee:                Gerald D. Ellenburg and Kristin Mary Tomczak
                                  1520 Gulf Boulevard, Suite 1406
                                  Clearwater, Florida 33767

         To Makers:               Jurgen Epple and Michael Edwards
                                  423 Cleveland Street, #6
                                  Clearwater, Florida 33755

Any party hereto may change its address for the purposes of this paragraph by
giving such other party notice, as provided for herein, of the new address.

         14.     Assignment.  Payees may assign all or any portion of their
rights, title or interest in this Note to any person, firm, corporation,
partnership or other entity without the consent of Makers.

         15.     Waiver.  Makers, each for himself, and his successors,
transferees and assigns and al guarantors, endorsers and signers, hereby waive
all valuation and appraisement privilege, presentment and demand for payment,
protest, notice of protest and nonpayment, dishonor and notice of dishonor,
bringing of suit, lack of diligence or delays in collection or enforcement of
this Note and notice of the intention to accelerate, the release of any party
liable and the release of any security for the debt, the taking of any
additional security and any other indulgence or forbearance.  Subject to the
provisions of Paragraph 8, Makers and their guarantors, successors, transferees
and assigns shall be jointly and severally, directly and primarily liable for
the amount of all sums owing and to be owed hereon, and each agrees that this
Note and any and all payments coming due hereunder may be extended or renewed
from time to time without in any way affecting or diminishing his liability
under this Note.

         16.     Headings.  The subject headings or titles of paragraphs of
this Note are included for purposes of convenience and reference only and shall
not affect the construction or interpretation of any of its provisions.

         17.     Waiver of Jury Trial.  MAKERS HEREBY KNOWINGLY, VOLUNTARILY
AND INTENTIONALLY WAIVE THE RIGHT TO TRIAL BY JURY IN RESPECT TO ANY LITIGATION
BASED UPON THIS NOTE AND ANY OTHER AGREEMENT CONTEMPLATED TO BE EXECUTED IN
CONNECTION HEREWITH, OR ANY COURSE 


                                      5

<PAGE>   6

OF DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN) OR ACTIONS OF MAKERS OR
PAYEES.

         18.     Entire Agreement.  This Note sets forth the entire agreement
of the Makers with respect to the subject matter hereof and may be modified or
amended only by a written instrument executed by Makers and Payees.  

MAKERS:


                                      /s/ Jurgen Epple                          
                                      -----------------------------------
                                      Jurgen Epple


                                      /s/ Michael Edwards                
                                      -----------------------------------       
                                      Michael Edwards



                                      6



<PAGE>   1
                                   EXHIBIT 4

                              ASSIGNMENT OF WARRANT

FOR VALUE RECEIVED, the undersigned hereby assigns all of its rights, title and
interest under that certain warrant agreement dated October 13, 1996 entered
into with Radius, Inc. under which the undersigned obtained the right to acquire
up to 200,000 shares of its Common Stock. The undersigned hereby confirms that,
based on the amount of credit extended to and utilized by Radius, Inc., such
warrant is for the purchase of 50,000 of such shares. Such warrant shall be
assigned on the following basis:

<TABLE>
<CAPTION>
             NAME                                        NUMBER OF SHARES
             ----                                        ----------------
             <S>                                         <C>
             Gerald D. Ellenberg and
             Kristin Mary Tomczak,
             as joint tenants                                25,001

             Norton S. Karno, Trustee of
             the Stephanie Lynn Karno
             Adult Trust #2                                   8,333

             Norton S. Karno, Trustee of
             the Valerie Ann Karno
             Adult Trust #2                                   8,333

             Norton S. Karno, Trustee of
             the Mitchell Perry Karno
             Adult Trust #2                                   8,333
                                                              
                                                             ------

                                    TOTAL SHARES             50,000
</TABLE>

Dated December 2, 1997              MITSUBISHI ELECTRONICS AMERICA, INC.



                                            By: /s/  Katsuhiko Hayakawa     
                                               ---------------------------------
                                               Katsuhiko Hayakawa
                                               Group President

<PAGE>   1

                                   EXHIBIT 5



                             STOCK PLEDGE AGREEMENT


         THIS STOCK PLEDGE AGREEMENT is made effective the 28th day of
November, 1997, (the "Effective Date") by JURGEN EPPLE and MICHAEL EDWARDS,
jointly and severally as "Pledgors," KARNO, SCHWARTZ, FRIEDMAN, SHAFRON &
WARREN, A Partnership Including Professional Corporations as "Pledge Holder,"
and GERALD D. ELLENBURG and KRISTIN MAY TOMCZAK as "Pledgees".

         1.      PLEDGE.   Pledgors hereby deposit with Pledge Holder and do
hereby, as of the Effective Date, pledge to Pledgees, as collateral security
for the payment in full, faithful, true and exact performance and observance of
all of the covenants and conditions of Pledgors as Makers of that certain
Promissory Note of even date herewith in the original principal amount of
$180,000, including but not limited to the payment, in full, of all such
indebtedness and any interest thereon, and other sums payable to Pledgees upon
or with respect to such indebtedness (collectively, the "Obligations"),
Pledgors' property (the "Collateral") described as

                 All of Pledgors' shares, but not less than 399,901 shares, of
                 the common stock of Radius, Inc., a California corporation
                 ("Radius"), whether held in the name of either of Pledgors or
                 held in the name of any other person or entity for the benefit
                 of Pledgors, or either of them, including but not limited to
                 any and all shares of Radius common stock acquired by Pledgors
                 or any other person or entity for the benefit of Pledgors, or
                 either of them at any time and from time to time after the
                 date hereof.

         2.      PRIORITY OF PLEDGE.   The within pledge is, or will be upon
the acquisition of such shares by Pledgors, a first priority lien on such
shares.

         3.      POWER OF SALE ON DEFAULT.   Pledgors hereby authorize and
empower Pledgees, upon any default of any one or more of the Pledgors in the
prompt payment or due performance of any of the Obligations, at their option
and without notice to Pledgors, except as specifically herein provided, to
collect, sell, assign and deliver, the whole or any part of the Collateral, and
to execute, on Pledgors' behalf all documents required in connection therewith,
including but not limited to any Assignment Separate From Certificate, or any
substitute therefor, or any additional thereto, at public or private sale, for
cash, upon credit, or for future delivery, without the necessity of the
Collateral being present at any such sale, or in view of prospective purchasers
thereof, and without any presentment, demand for performance, protect, notice
of protest, or notice of dishonor, or advertisement, any such demand or
advertisement being expressly waived.  Pledgees shall give Pledgors, and each
of them, and the Pledge Holder, ten (10) days' notice by United States mail,
postage prepaid, at the addresses specified herein, of the time and place of
any public or private sale.  Upon such sale, Pledgees may become the purchaser
of the whole or any part of the Collateral sold, discharged from all claims and
free from any right of redemption.  The foregoing is hereby made subject to the
following provisions, to wit:  That Pledgees shall include in such notice of
the time and place of such sale a statement of the grounds upon which
default(s) is (are) based; and, that during such ten-day period, Pledgors, or
any one


<PAGE>   2

or more of them, may cure such default, in which event said sale shall not be
held and it shall be deemed that no such default occurred.

         4.      APPLICATION OF PROCEEDS.   In case of any sale, transfer or
disposal of the Collateral, whether pursuant to a sale by Pledgees under
Paragraph 3 above, or any sale of all or any portion of Pledgors' interest in
the Collateral (including but not limited to the sale of any call option with
respect to the Collateral), Pledgors covenant and agree that the proceeds
thereof shall first be applied to the payment of the expenses of such sale,
commissions, attorneys' fees and all charges paid or incurred by Pledge Holder
hereunder; second, to the payment of the expenses of such sale, commissions,
attorneys' fees and all charges paid or incurred by Pledgees pertaining to
sale, including any taxes or other charges imposed by law upon the Collateral
and/or the owning, holding or transferring thereof; third, to pay, satisfy and
discharge the Note and any other indebtedness arising out of or under this
Stock Pledge Agreement; fourth, to pay, satisfy and discharge the duties and
obligations of Pledgors pursuant to any Stock Pledge Agreement hereafter
executed by Pledgors with Pledgees' consent, junior to this Stock Pledge
Agreement, and the respective indebtedness secured thereby, in the order of
their respective priority; and fifth, to pay the surplus, if any, to Pledgors.

         5.      ADDITIONAL RIGHTS OF PLEDGEES.   Pledgees specifically and
expressly reserve the right and remedy to disregard the security hereof, and to
sue on the principal obligation secured hereby, and expressly declare that
their remedies upon this Stock Pledge Agreement, to cause the sale of the
collateral at public or private sale in the manner as hereinabove set forth, or
to bring an action of foreclosure and have the Collateral sold at judicial
sale, are cumulative, and in addition to all other remedies that they may
possess under the Uniform Commercial Code.  Pledges shall have the right to
recover, as a part of any judgment in an action of foreclosure, commissions,
attorneys' fees, and all charges and expenses paid or incurred by them in
connection with any such foreclosure sale.  Subject to the provisions of
paragraph 8 of the Promissory Note secured hereby, Pledgees reserve the right
to recover any deficiency judgment arising from such sale or sales, whether
judicial or by way of pledge sale.

         6.      ADDITIONS TO COLLATERAL.   Any stock rights, and rights to
subscribe, cash dividends, liquidating dividends, stock dividends, dividends
paid in stock, new securities, or other property, which Pledgors may hereafter
become entitled to receive on account of the Collateral, shall be and become a
part of the Collateral, and in the event that Pledgors shall receive any such,
they represent, warrant, covenant and agree that they will immediately deliver
it to the Pledge Holder to be held by it in the same manner as the Collateral
originally pledged hereunder.

         7.      INDEMNITY.   In case of any adverse claims in respect to the
Collateral or any portions thereof, arising out of any act done or suffered by
Pledgors, the Pledgors promise and agree to hold harmless and to indemnify
Pledge Holder and Pledgees from and against any losses, liabilities, damages,
expenses, costs and reasonable attorneys' fees incurred in or about defending,
protecting, or prosecuting the security interests hereby created.

         8.      ADVANCES TO PROTECT COLLATERAL.   Pledgors agree to pay, prior
to delinquency, all taxes, liens and assessments against the Collateral, and
upon their failure to do so, Pledgees, at their option, may pay any of them,
and shall be the sole judge of the legality or validity thereof and the amount
necessary to discharge same, and Pledgors' failure to pay same shall be a
default hereunder and the sums so advanced shall be due and payable to Pledgees
together with interest thereon at the rate of twelve percent (12%) per annum
until fully repaid.


                                      2


<PAGE>   3

         9.      NON-WAIVER.   Any forbearance or failure or delay by Pledgees
in exercising any right, power or remedy hereunder shall not be deemed to be a
waiver of such right, power or remedy, and any single or partial exercise of
any right, power or remedy of Pledgees shall continue in full force and effect
until such right, power or remedy is specifically waived by an instrument in
writing, executed by Pledgees.

         10.     RELEASE OF COLLATERAL.   When the Obligations shall have been
fully performed and satisfied and Pledgees shall have received payment in full
of all other sums owed hereunder, then, and only then, this Stock Pledge
Agreement shall be canceled and of no further force and effect, and Pledge
Holder shall thereupon deliver to the respective Pledgors the Collateral free
and clear of the lien of this pledge.

         11.     VOTING RIGHTS.   During the term of this Stock Pledge
Agreement and so long as the Pledgors, and each of them, are not in default
under the Obligations, the respective Pledgors shall have the right to vote any
shares of stock pledged hereby on all corporate questions. The foregoing
notwithstanding, Pledgors agree not to vote their shares of Radius stock, in
any manner which would result in a liquidation, dissolution or merger of Radius
until such time as the Obligations are wholly satisfied.

         12.     SUCCESSOR PLEDGE HOLDER-LIMITATION ON LIABILITY.   In the
event that the Pledge Holder becomes incapacitated due to dissolution or
disability so that it is no longer able to act as Pledge Holder, Kenneth L.
Friedman, A Professional corporation, shall thereupon be the Successor Pledge
Holder. Pledgors hereby acknowledge that the Pledge Holder and the Successor
Pledge Holder are affiliated with one another and have heretofore acted as
legal counsel to one or both of Pledgees and after consulting with independent
legal counsel, hereby waive all conflicts of interest arising out of Pledge
Holder's and/or the Successor Pledge Holder's performance of its obligations
hereunder.  Pledge Holders shall only be liable to Pledgors for its acts of
gross negligence or willful misconduct.

         13.     PLEDGORS' REPRESENTATION AND WARRANTIES.   Pledgors each
represent and warrant that (i) Pledgors now own the collateral, (ii) Pledgors
have not heretofore sold, transferred, conveyed, hypothecated or otherwise
assigned any of their interest in the Collateral to any other person or entity,
(iii) unless and until the Obligations have been fully discharged, each of them
will not (a) issue any replacement stock certificate with respect to the
Collateral, or (b) make any further assignment or pledge of the Collateral, all
without Pledgees' prior written consent.

         14.     CONSTRUCTION.   This Agreement, and all of the rights and
duties in connection therewith, shall be governed by the laws of the State of
Florida, the state in which the loan evidenced by the Note was made, and the
state in which Pledgors maintain their principal residences.

         15.     NOTICE.   Any notice, report or writing required or permitted
to be given hereunder shall be in writing and shall be served by delivering the
same personally either to the other party, or to the agents, officers or other
representatives thereof hereinbelow designated, if any, or by depositing the
notice, contained in a sealed envelope, postage prepaid, in the United States
Postal System as registered or certified mail, with return receipt requested or
as Express Mail.  Any and all such notices shall be delivered to the parties at
their respective addresses specified in this paragraph.  Any such notice
deposited in the mail shall be conclusively deemed delivered to and received by
the addressee two (2) business days after the deposit in the mail as registered
or certified mail, return receipt requested, or one (1) business day after
deposit in the mail as Express Mail if all of the foregoing conditions of
notice shall 



                                      3

<PAGE>   4

have been satisfied and if such notice shall at the time of mailing have been 
contained in an envelope addressed as follows:


         To Pledgors:                      Jurgen Epple and Michael Edwards
                                           423 Cleveland Street, #6
                                           Clearwater, Florida  33755

         To Pledgee:                       Gerald D. Ellenburg and
                                           Kristin Mary Tomczak 
                                           1520 Gulf Boulevard, Suite 1406
                                           Clearwater, Florida  33767

         To Pledge Holder:                 Karno, Schwartz, Friedman,
                                           Shafron & Warren 
                                           16255 Ventura Boulevard, Suite 1200
                                           Encino, California  91436
                                           Attention:  Kenneth L. Friedman

Any party hereto may change its address for the purposes of this paragraph by
giving such other party notice, as provided for herein, of the new address.

         16.     COUNTERPARTS.   This Stock Pledge Agreement may be executed in
counterparts; each thereof is hereby declared to be an original; all, however,
shall constitute but one and the same agreement.

         17.     HEIRS AND SUCCESSORS.   This Stock Pledge Agreement and all of
its terms and provisions shall be binding upon the heirs, successors,
transferees and assigns of each of the parties hereto.

         IN WITNESS WHEREOF, the parties hereto have executed this Stock Pledge
Agreement effective the date first hereinabove set forth.

         PLEDGORS:

                                        /s/ Jurgen Epple 
                                        -------------------------------
                                        JURGEN EPPLE



                                        /s/ Michael Edwards 
                                        ------------------------------- 
                                        MICHAEL EDWARDS

         PLEDGEE:


                                        /s/ Gerald D. Ellenburg 
                                        -------------------------------
                                        GERALD D. ELLENBURG


                                        /s/ Kristin Mary Tomczak 
                                        -------------------------------
                                        KRISTIN MARY TOMCZAK


                                      4

<PAGE>   5


                 PLEDGE HOLDER:

                                        KARNO, SCHWARTZ, FRIEDMAN,
                                        SHAFRON & WARREN, A Partnership
                                        Including Professional Corporations

                                        By:      KENNETH L. FRIEDMAN, A
                                                 Professional Corporation,
                                                 General Partner



                                                 By:/s/ Kenneth L. Friedman 
                                                 ----------------------------
                                                 KENNETH L. FRIEDMAN, 
                                                 President



                                       5

<PAGE>   1
                                   EXHIBIT 6


                      PROMISSORY NOTE SECURED BY MORTGAGE,
               STOCK PLEDGE AGREEMENTS, AND COLLATERAL ASSIGNMENTS

$1,022,400                  Clearwater, Florida                November 28, 1997


         FOR VALUABLE CONSIDERATION, the receipt and adequacy of which are
hereby acknowledged, GERALD D. ELLENBURG and KRISTIN MARY TOMCZAK (collectively,
"Makers"), jointly and severally promise to pay to NORTON S. KARNO, TRUSTEE OF
NORTON S. KARNO, A PROFESSIONAL CORPORATION, AMENDED AND RESTATED EMPLOYEES'
RETIREMENT PLAN AND TRUST ("Payee"), or order, at 16255 Ventura Boulevard, Suite
1200, Encino, California 91436, or at such other address as Payee may, from time
to time, designate, the sum of One Million, Twenty-Two Thousand, Four Hundred
Dollars ($1,022,400) with interest on the unpaid balance outstanding from time
to time, subject to the provisions of Paragraph 2, at the rate described below.

         1.       Definitions.

                  a.       Funding Date. The "Funding Date" shall be December 1,
                           1997.

                  b.       Maturity Date. The "Maturity Date" shall be November
                           30, 2000.

                  c.       Payee. As used herein, the term "Payee" shall include
the herein named Payee and all of said Payee's heirs, successors and assigns and
shall mean the person(s) and/or entity(ies) holding the Payee's interest in this
Note at any time.

         2.       Interest Rate. Commencing with the Funding Date and continuing
until fully paid, the unpaid principal balance of this Note shall bear interest
at the rate of twelve percent (12%) per annum. Interest not paid when due shall
be added to principal on its due date, without notice to Makers, and without any
grace period, and shall thereafter bear interest.

         3.       Payments.

                  a.       Monthly Interest Payments. Payments of interest then
accrued shall be due on the first day of each month commencing January 1, 1998.
Any such installment of interest not paid when due shall be added to principal
and thereupon bear interest.

                  b.       Proceeds of Sale of Radius Stock. Upon Makers' sale
or transfer of all or any portion of their stock in Radius, Inc., a California
corporation, or any interest therein, or any rights thereto, including but not
limited to any proceeds of any sale of any call option with respect thereto
(collectively, a "Sale"), Makers shall cause the entire net proceeds of such
Sale (up to the total amount of then accrued but unpaid interest and principal
owed upon this Note) to be paid to Payee and Payee shall apply same, upon
receipt, (i) first to any cost or expense incurred by Payee in collecting same
from Makers (including but not limited to any attorneys fees or other costs
incurred in enforcing Payee's rights hereunder, (ii) then to past-due, accrued



                                       1
<PAGE>   2

but unpaid interest, (iii) then to the interest accrued but unpaid since the
last regularly scheduled payment date pursuant to Paragraph 2 above, and (iv)
then to principal. As used herein, the "net proceeds" of a Sale means all
proceeds of such Sale reduced only by all direct selling expenses incurred and
paid, at the time of the closing of such Sale, to persons or entities not
related to, or affiliated with, Makers or either of them, directly or
indirectly, including but not limited to brokerage commissions and registration
expenses.

                  c.       Final Principal Payment. On the Maturity Date, Makers
shall pay Payee the entire unpaid principal balance hereof, together with all
then accrued but unpaid interest thereon.

         4.       Prepayment. Makers may prepay the indebtedness evidenced
hereby, in whole or in part, at any time.

         5.       Security. This Note is secured by:

                  a.       a first priority Stock Pledge Agreement executed by
Makers pledging all of their stock of Radius, Inc. (referred to herein as the
"Radius Stock Pledge Agreement");

                  b.       a Stock Pledge Agreement executed by Makers pledging
all of their stock of Digital Lightwave, Inc., a Delaware corporation (referred
to herein as the "Digital Stock Pledge Agreement");

                  c.       a fourth priority Mortgage encumbering Makers' real
property commonly known as 16 Ambleside Drive, Belleair, Florida 34616 (referred
to herein as the "Mortgage");

                  d.       a first priority Collateral Assignment of Note and
Stock Pledge (the "Epple/Edwards Collateral Assignment") executed by Makers
pledging that certain Promissory Note made by Jurgen Epple and Michael Edwards
as makers to Gerald D. Ellenburg and Kristin Mary Tomczak as payee in the
original principal amount of One Hundred Eighty Thousand Dollars ($180,000) (the
"Epple/Edwards Note") and the Stock Pledge Agreement made by Jurgen Epple and
Michael Edwards as pledgors to Gerald D. Ellenburg and Kristin Mary Tomczak as
pledgee pledging all of said pledgors' stock of Radius, Inc. as security for the
Epple/Edwards Note (referred to herein as the "Epple/Edwards Stock Pledge
Agreement"); and

                  e.       a Collateral Assignment of General Partner interests
executed by Makers pledging all of the interests of Gerald D. Ellenburg as a
General Partner in those partnerships described on Exhibit A attached hereto and
incorporated herein by reference (referred to herein as the "Partnership
Collateral Assignment" and collectively referred to with the Radius Stock
Pledge Agreement, the Digital Stock Pledge Agreement, the Mortgage, and the
Epple/Edwards Collateral Assignment as the "Security Instruments").

As additional consideration to Payee to make the loan evidenced hereby,
Makers are, concurrently herewith, granting Payee and Payee's affiliates,
additional security interests in Makers' Radius, Inc. stock pursuant to
additional Stock Pledge Agreements junior in priority to the Radius Stock Pledge
Agreement being made as a part of the security for the loan evidenced 




                                       2
<PAGE>   3
hereby. As set forth in such other Stock Pledge Agreements, Makers shall
employ any of their net proceeds of any Sale of their Radius, Inc. stock
remaining after this Note has been fully repaid to discharge the other
indebtedness and obligations then secured by such other Stock Pledge Agreements.

     6.       Events of Default and Remedies.

         a.  Any one of the following occurrences shall constitute an "Event of
Default" under this Note:

               i.    Makers' failure to pay any installment of interest, 
          principal or interest and principal on the date due of such payment;

               ii.   Makers' breach of any of their other covenants and
          agreements hereunder; or

               iii.  The occurrence of any Event of Default or material breach
          under any of the Security Instruments.

         b.  Upon the occurrence of any Event of Default under this Note:

               i.    The entire unpaid principal balance, any accrued but
          unpaid interest and all other amounts owing under this Note and all
          other sums owing under the Security Instruments shall, at the option
          of Payee of this Note and without notice or demand of any kind to
          Makers or any other person, immediately become due and payable; and

               ii.   Payee shall have and may exercise any and all rights and
          remedies available at law or in equity and also any and all rights and
          remedies provided in the Security Instruments.

     The remedies of Payee, as provided in this Note and in the Security
Instruments, shall be cumulative and concurrent and may be exercised singularly,
successively or together, at the sole discretion of Payee, and may be exercised
as often as occasion therefor shall arise. No act or omission or commission  of
Payee, including specifically any failure to exercise any right, remedy or
recourse, shall be deemed to be a waiver or release of any right, remedy or
recourse, such waiver or release to be effected only through a written document
executed by Payee. A waiver or release with reference to any one event shall not
be construed as continuing, as a bar to, or as a waiver or release of, any
subsequent right, remedy or recourse as to a subsequent event.

 
     7.       Legal Limits. All agreements between Makers and Payee are hereby
expressly limited so that in no event whatsoever, whether by reason of deferment
in accordance with this Note or under any agreement or by virtue of acceleration
or maturity of the indebtedness evidenced hereby, or otherwise, shall the amount
paid or agreed to be paid to the Payee hereof, for the loan, use, forbearance,
or detention of the money to be loaned under this Note or to



                                       3
<PAGE>   4
compensate Payee for damages to be suffered by reason of a late payment or
default under this Note exceed the maximum permissible under applicable law. If,
for any circumstances whatsoever, fulfillment of any provisions of this Note or
any provision in the Stock Pledge Agreement at the time the performance of such
provision shall be due, shall involve exceeding the limit of validity prescribed
by law, ipso facto, the obligations to be fulfilled shall be reduced to the
limit of such validity. This provision shall never be superseded or waived and
shall control every other provision of all agreements among Makers and Payee.

         8.       Loan Costs. Makers covenant and agree to pay Karno, Schwartz,
Friedman, Shafron & Warren all of the legal fees and costs incurred by Payee in
negotiating, documenting and in closing the loan evidenced by this Note and all
of the Security Instruments and all documents related thereto, including but not
limited to the letter describing and waiving conflicts of interest and the
acquisition of adverse interests.

         9.       Attorneys' Fees. Should an Event of Default occur under this
Note, Makers agree to pay a reasonable sum to Payee for attorneys' fees incurred
in collecting the sums due hereunder and enforcing the rights and remedies of
Payee under this Note and under the Security Agreement. If any action is brought
to enforce or interpret the provisions of this Note, the prevailing party shall
be entitled to a reasonable sum for attorneys' fees.

         10.       Governing Law and Severability. This Note and the Security
Agreement are made pursuant to and shall be construed and governed by the laws
of the State of Florida (which is the state in which Makers maintain their
principal residence) and all rules and regulations promulgated thereunder. If
any provision of this Note or of the Security Agreement is construed or
interpreted by a court of competent jurisdiction to be void, invalid or
unenforceable, such decision shall affect only those provisions so construed or
interpreted and shall not affect the remaining provisions of this Note or of the
Security Agreement.

         11.      Time of Essence. Time is of the essence of this Note.

         12.      Payment Without Offset. Principal and interest shall be paid
without deduction or offset in lawful money of the United States of America.

         13.      Notices. Any notice, report or writing required or permitted
to be given hereunder shall be in writing and shall be served by delivering the
same personally either to the other party, or by depositing the notice,
contained in a sealed envelope, postage prepaid, in any mailbox maintained by
the United States Postal System for the purpose of depositing mail into said
System, as registered or certified mail, with return receipt requested or by
Express Mail, certified with return receipt requested. Any and all such
notices shall be delivered to the parties at their respective addresses
specified in this paragraph. Any such notice deposited in the mail shall be
conclusively deemed delivered to and received by the addressee three (3)
business days after the deposit in the mail as first class mail, or one (1)
business day after deposit in the mail as Express Mail, if all of the foregoing
conditions of notice shall have been satisfied and if such notice shall at the
time of mailing have been contained in an envelope addressed as follows:




                                       4
<PAGE>   5

         To Payee:    Norton S. Karno, Trustee
                      16255 Ventura Boulevard, Suite 1200
                      Encino, California 91436

         To Makers:   Gerald D. Ellenburg and Kristin Mary Tomczak
                      1520 Gulf Boulevard, Suite 1406
                      Clearwater, Florida 33767

Any party hereto may change its address for the purposes of this paragraph by
giving such other party notice, as provided for herein, of the new address.

         14.      Assignment. Payee may assign all or any portion of their
rights, title or interest in this Note to any person, firm, corporation,
partnership or other entity without the consent of Makers.

         15.      Waiver. Makers, each for himself, herself and his or her
successors, transferees and assigns and all guarantors, endorsers and signers,
hereby waive all valuation and appraisement privilege, presentment and demand
for payment, protest, notice of protest and nonpayment, dishonor and notice of
dishonor, bringing of suit, lack of diligence or delays in collection or
enforcement of this Note and notice of the intention to accelerate, the release
of any party liable and the release of any security for the debt, the taking of
any additional security and any other indulgence or forbearance. Makers and
their guarantors, successors, transferees and assigns shall be jointly and
severally, directly and primarily liable for the amount of all sums owing and to
be owed hereon, and each agrees that this Note and any and all payments coming
due hereunder may be extended or renewed from time to time without in any way
affecting or diminishing his liability under this Note.

         16.      Headings. The subject headings or titles of paragraphs of this
Note are included for purposes of convenience and reference only and shall not
affect the construction or interpretation of any of its provisions.

         17.      Waiver of Jury Trial. MAKERS HEREBY KNOWINGLY, VOLUNTARILY AND
INTENTIONALLY WAIVE THE RIGHT TO TRIAL BY JURY IN RESPECT TO ANY LITIGATION
BASED UPON THIS NOTE AND ANY OTHER AGREEMENT CONTEMPLATED TO BE EXECUTED IN
CONNECTION HEREWITH, OR ANY COURSE OF DEALING, STATEMENTS (WHETHER VERBAL OR
WRITTEN) OR ACTIONS OF MAKERS OR PAYEE.




                                       5
<PAGE>   6

         18.      Entire Agreement. This Note sets forth the entire agreement of
the Makers with respect to the subject matter hereof and may be modified or
amended only by a written instrument executed by Makers and Payee.


MAKERS:

                             /s/ Gerald D. Ellenburg
                             -------------------------------------
                             Gerald D. Ellenburg


                             /s/ Kristin M. Tomczak
                             ------------------------------------
                             Kristin M. Tomczak




                                       6

<PAGE>   1
                                   EXHIBIT 7


                             STOCK PLEDGE AGREEMENT


         THIS STOCK PLEDGE AGREEMENT is made effective the 28th day of November,
1997 (the "Effective Date") by GERALD D. ELLENBERG and KRISTIN MARY TOMCZAK as
"Pledgors," KARNO, SCHWARTZ, FRIEDMAN, SHAFRON & WARREN, A Partnership Including
Professional Corporations as "Pledge Holder," and NORTON S. KARNO, TRUSTEE OF
THE NORTON S. KARNO, A PROFESSIONAL CORPORATION, AMENDED AND RESTATED EMPLOYEES'
RETIREMENT PLAN AND TRUST as "Pledgee".

         1.       PLEDGE. Pledgors hereby deposit with Pledge Holder and do
hereby, as of the Effective Date, pledge to Pledgee, as collateral security for
the payment in full, faithful, true and exact performance and observance of all
of the covenants and conditions of Pledgors as Makers of that certain Promissory
Note of even date herewith in the original principal amount of $1,022,400,
including but not limited to the payment, in full, of all such indebtedness and
any interest thereon, and other sums payable to Pledgee upon or with respect to
such indebtedness (collectively, the "Obligations"), Pledgors' property (the
"Collateral") described as

                  All of Pledgors' shares of and warrants to purchase shares of
                  the common stock of Radius, Inc., a California corporation
                  ("Radius"), whether held in the name of either of Pledgors or
                  held in the name of any other person or entity for the benefit
                  of Pledgors, or either of them, including but not limited to
                  any and all shares of and warrants to purchase shares of
                  Radius common stock acquired by Pledgors or any other person
                  or entity for the benefit of Pledgors, or either of them at
                  any time and from time to time after the date hereof.

         2.       PRIORITY OF PLEDGE. The within pledge is, or will be upon the
acquisition of such shares and warrants by Pledgors, a first priority lien on
such shares and warrants.

         3.       POWER OF SALE ON DEFAULT. Pledgors hereby authorize and
empower Pledgee, upon any default of any one or more of the Pledgors in the
prompt payment or due performance of any of the Obligations, at its option and
without notice to Pledgors, except as specifically herein provided, to collect,
sell, assign and deliver, the whole or any part of the Collateral, and to
execute, on Pledgors' behalf all documents required in connection therewith,
including but not limited to any Assignment Separate From Certificate, or any
substitute therefor, or any addition thereto, at public or private sale, for
cash, upon credit, or for future delivery, without the necessity of the
Collateral being present at any such sale, or in view of prospective purchasers
thereof, and without any presentment, demand for performance, protest, notice of
protest, or notice of dishonor, or advertisement, any such demand or
advertisement being expressly waived. Pledgees shall give Pledgors, and each of
them, and the Pledge Holder, ten (10) days' notice by United States mail,
postage prepaid, at the addresses specified herein, of the time and place of any
public or private sale. Upon such sale, Pledgees may become the



<PAGE>   2

purchaser of the whole or any part of the Collateral sold, discharged from all
claims and free from any right of redemption. The foregoing is hereby made
subject to the following provisions, to wit: That Pledgees shall include in such
notice of the time and place of such sale a statement of the grounds upon which
default(s) is (are) based; and, that during such ten-day period, Pledgors, or
any one or more of them, may cure such default, in which event said sale shall
not be held and it shall be deemed that no such default occurred.

         4.       APPLICATION OF PROCEEDS. In case of any sale, transfer or
disposal of the Collateral, whether pursuant to a sale by Pledgees under
Paragraph 3 above, or any sale of all or any portion of Pledgors' interest in
the Collateral (including but not limited to the sale of any call option with
respect to the Collateral), Pledgors covenant and agree that the proceeds
thereof shall first be applied to the payment of the expenses of such sale,
commissions, attorneys' fees and all charges paid or incurred by Pledge Holder
hereunder; second, to the payment of the expenses of such sale, commissions,
attorneys' fees and all charges paid or incurred by Pledgees pertaining to sale,
including any taxes or other charges imposed by law upon the Collateral and/or
the owning, holding or transferring thereof; third, to the payment of the
expenses of such sale, commissions, attorneys' fees and all charges paid or
incurred by Pledgors pertaining to said sale but exclusive of any taxes or other
charges imposed by law upon the owning, holding or transferring of the
Collateral; fourth, to pay, satisfy and discharge the Note (and any other
indebtedness of Pledgors under any of the instruments securing the Note); fifth,
to pay, satisfy and discharge the duties and obligations of Pledgors pursuant to
the Stock Pledge Agreement, and the respective indebtedness secured thereby, in
the order of their respective priority; and sixth, to pay the surplus, if any,
to Pledgors.

         5.       ADDITIONAL RIGHTS OF PLEDGEES. Pledgee specifically and
expressly reserve the right and remedy to disregard the security hereof, and to
sue on the principal obligation secured hereby, and expressly declare that its
remedies upon this Stock Pledge Agreement, to cause the sale of the Collateral
at public or private sale in the manner as hereinabove set forth, or to bring an
action of foreclosure and have the Collateral sold at judicial sale, are
cumulative, and in addition to all other remedies that he may possess under the
Uniform Commercial Code. Pledgee shall have the right to recover, as a part of
any judgment in an action of foreclosure, commissions, attorneys' fees, and all
charges and expenses paid or incurred by him in connection with any such
foreclosure sale. Pledgee reserves the right to recover any deficiency judgment
arising from such sale or sales, whether judicial or by way of pledge sale.
However, Pledgee shall not be entitled to recover attorneys' fees and costs if
any default is cured within the ten-day notice period described in Paragraph 3
above.

         6.       ADDITIONS TO COLLATERAL. Any stock rights, and rights to
subscribe, cash dividends, liquidating dividends, stock dividends, dividends
paid in stock, new securities, or other property, which Pledgors may hereafter
become entitled to receive on account of the Collateral, shall be and become a
part of the Collateral, and in the event that Pledgors shall receive any such,
they represent, warrant, covenant and agree that they will immediately deliver
it to the Pledge Holder to be held by it in the same manner as the Collateral
originally pledged hereunder.

                                       2
<PAGE>   3

         7.       INDEMNITY. In case of any adverse claims in respect to the
Collateral or any portions thereof, arising out of any act done or suffered by
Pledgors, the Pledgors promise and agree to hold harmless and to indemnify
Pledge Holder and Pledgee from and against any losses, liabilities, damages,
expenses, costs and reasonable attorneys' fees incurred in or about defending,
protecting, or prosecuting the security interests hereby created.

         8.       ADVANCES TO PROTECT COLLATERAL. Pledgors agree to pay, prior
to delinquency, all taxes, liens and assessments against the Collateral, and
upon their failure to do so, Pledgee, at his option, may pay any of them, and
shall be the sole judge of the legality or validity thereof and the amount
necessary to discharge same, and Pledgors' failure to pay same shall be a
default hereunder and the sums so advanced shall be due and payable to Pledgees
together with interest thereon at the rate of twelve percent (12%) per annum
until fully repaid.

         9.       NON-WAIVER. Any forbearance or failure or delay by Pledgee in
exercising any right, power or remedy hereunder shall not be deemed to be a
waiver of such right, power or remedy, and any single or partial exercise of any
right, power or remedy of Pledgee shall continue in full force and effect until
such right, power or remedy is specifically waived by an instrument in writing,
executed by Pledgee.

         10.      RELEASE OF COLLATERAL. When the Note shall have been fully
performed and satisfied and Pledgee shall have received payment in full of the
Note and all other sums due under the instruments securing the Note, then, and
only then, this Stock Pledge Agreement shall be canceled and of no further force
and effect, and Pledge Holder shall thereupon deliver to the respective Pledgors
the Collateral free and clear of the lien of this pledge.

         11.      VOTING RIGHTS. During the term of this Stock Pledge Agreement
and so long as the Pledgors, and each of them, are not in default under the
Obligations, the respective Pledgors shall have the right to vote any shares of
stock pledged hereby on all corporate questions. The foregoing notwithstanding,
Pledgors agree not to vote their shares of Radius stock, in any manner which
would result in a liquidation, dissolution or merger of Radius until such time
as the Obligations are wholly satisfied.

         12.      SUCCESSOR PLEDGE HOLDER-LIMITATION ON LIABILITY. In the event
that the Pledge Holder becomes incapacitated due to dissolution or disability so
that it is no longer able to act as Pledge Holder, Kenneth L. Friedman, A
Professional Corporation, shall thereupon be the Successor Pledge Holder.
Pledgors hereby acknowledge that the Pledge Holder and the Successor Pledge
Holder are affiliated with one another and with Pledgee and after consulting
with independent legal counsel or, having had the opportunity to do so, having
elected not to so consult such counsel, hereby waive all conflicts of interest
arising out of Pledge Holder's and/or the Successor Pledge Holder's performance
of its obligations hereunder. Pledge Holders shall only be liable to Pledgors
for its acts of gross negligence or willful misconduct.

         13.      PLEDGORS' REPRESENTATION AND WARRANTIES. Pledgors each
represent and warrant that (i) Pledgors now own the Collateral, (ii) Pledgors
have not heretofore


                                       3
<PAGE>   4

sold, transferred, conveyed, hypothecated or otherwise assigned any of their
interest in the Collateral to any other person or entity, (iii) unless and until
the Obligations have been fully discharged, each of them will not (a) issue any
replacement stock certificate with respect to the Collateral, or (b) make any
further assignment or pledge of the Collateral, all without Pledgees' prior
written consent.

         14.      CONSTRUCTION. This Agreement, and all of the rights and duties
in connection therewith, shall be governed by the laws of the State of Florida,
the state in which the loan evidenced by the Note was made, and the state in
which Pledgors maintain their principal residences.

         15.      NOTICE. Any notice, report or writing required or permitted to
be given hereunder shall be in writing and shall be served by delivering the
same personally either to the other party, or to the agents, officers or other
representatives thereof hereinbelow designated, if any, or by depositing the
notice, contained in a sealed envelope, postage prepaid, in the United States
Postal System as registered or certified mail, with return receipt requested or
as Express Mail. Any and all such notices shall be delivered to the parties at
their respective addresses specified in this paragraph. Any such notice
deposited in the mail shall be conclusively deemed delivered to and received by
the addressee two (2) business days after the deposit in the mail as registered
or certified mail, return receipt requested, or one (1) business day after
deposit in the mail as Express Mail if all of the foregoing conditions of notice
shall have been satisfied and if such notice shall at the time of mailing have
been contained in an envelope addressed as follows:

         To Pledgors:           Gerald D. Ellenberg and Kristin Mary Tomczak
                                1520 Gulf Boulevard, Suite 1406
                                Clearwater, Florida  33767

         To Pledgee:            Norton S. Karno, Trustee
                                16255 Venture Boulevard, Suite 1200
                                Encino, California  91436

         To Pledge Holder:      Karno, Schwartz, Friedman, Shafron & Warren
                                16255 Ventura Boulevard, Suite 1200
                                Encino, California  91436
                                Attention:  Kenneth L. Friedman

Any party hereto may change its address for the purposes of this paragraph by
giving such other party notice, as provided for herein, of the new address.

         16.      COUNTERPARTS. This Stock Pledge Agreement may be executed in
counterparts; each thereof is hereby declared to be an original; all, however,
shall constitute but one and the same agreement.


                                       4
<PAGE>   5

         17.      HEIRS AND SUCCESSORS. This Stock Pledge Agreement and all of
its terms and provisions shall be binding upon the heirs, successors,
transferees and assigns of each of the parties hereto.

         IN WITNESS WHEREOF, the parties hereto have executed this Stock Pledge
Agreement effective the date first hereinabove set forth.

         PLEDGORS: 

                               /s/ Gerald D. Ellenburg
                               ------------------------------------------
                               GERALD D. ELLENBURG


                               /s/ Kristin Mary Tomczak
                               ------------------------------------------
                               KRISTIN MARY TOMCZAK

         PLEDGEE:





                               /s/ Norton S. Karno, Trustee
                               -----------------------------------------
                               NORTON S. KARNO, TRUSTEE OF THE
                               NORTON S. KARNO, A PROFESSIONAL
                               CORPORATION, AMENDED AND RESTATED
                               EMPLOYEES' RETIREMENT PLAN AND
                               TRUST

         PLEDGE HOLDER:

                               KARNO, SCHWARTZ, FRIEDMAN,
                               SHAFRON & WARREN, A Partnership
                               Including Professional Corporations


                               By:      KENNETH L. FRIEDMAN, A
                                        Professional Corporation,
                                        General Partner



                                        By:/s/ Kenneth L. Friedman
                                           --------------------------------
                                           KENNETH L. FRIEDMAN,
                                           President

                                      5

<PAGE>   1

                                   EXHIBIT 8


                             FINDER'S FEE AGREEMENT


         THIS FINDER'S FEE AGREEMENT (this "Agreement") is entered into between
NORTON S. KARNO, TRUSTEE OF THE STEPHANIE LYNN KARNO ADULT TRUST #2, VALERIE
ANN KARNO ADULT TRUST #2 AND MITCHELL PERRY KARNO ADULT TRUST #2 (collectively
the "Karno Trusts"), GERALD D. ELLENBURG AND KRISTIN MARY TOMCZAK
(collectively, "Ellenburg" and together with the Karno Trusts, the "Owners")
and JURGEN EPPLE AND MICHAEL EDWARDS (collectively, "Finders") as follows:

         1.      Finders introduced Owners to Radius, Inc., a NASDAQ traded
company ("Radius") and Owners acquired an option to purchase 3,600,000 (Owners'
net share of 3,999,901 shares) shares of Radius and a Warrant for 50,000 shares
of Radius (the "Warrant").

         2.      Owners exercised said option and purchased said Radius shares
and acquired the Warrant on December 2, 1997.

         3       Owners agree to pay Finders a Finder's Fee of $64,800 in
accordance with EXHIBIT A attached hereto concurrently with the execution of
this Agreement.  This Fee fully compensates Finders for any and all services
provided to Owners in relation to Owners' purchase of said Radius shares and
the Warrant.

         4.      Owners agree to pay as an additional Finder's Fee, on December
2 of each year, commencing December 2, 1998, and continuing only so long as
both Owners and Finders continue to own their respective Radius shares, an
annual Fee of 1% of the December 2 value in said respective year of however
many Radius shares Owners own of said 3,600,000 shares.  Said Fee is herein
pledged to pay any interest that is concurrently due to Owners or any of them
on loans owed by Finders to Owners.

  5.      This Agreement will be governed by the laws of the State of Florida.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of this 2nd day of December, 1997.



                        [SIGNATURES FOLLOW ON NEXT PAGE]




                                       1
<PAGE>   2


                                    OWNERS:


                                        /s/ Norton S. Karno 
                                        -----------------------------
                                        Norton S. Karno,
                                        Trustee of Stephanie Lynn
                                        Karno Adult Trust #2


                                        /s/ Norton S. Karno 
                                        -----------------------------
                                        Norton S. Karno,
                                        Trustee of Valerie Ann Karno
                                        Adult Trust #2


                                        /s/ Norton S. Karno 
                                        -----------------------------
                                        Norton S. Karno,
                                        Trustee of Mitchell Perry
                                        Karno Adult Trust #2


                                        /s/ Gerald D. Ellenburg 
                                        -----------------------------
                                        Gerald D. Ellenburg


                                        /s/ Kristin Mary Tomczak 
                                        -----------------------------
                                        Kristin Mary Tomczak


                                    FINDERS:


                                        /s/ Jurgen Epple 
                                        -----------------------------
                                        Jurgen Epple


                                        /s/ Michael Edwards 
                                        -----------------------------
                                        Michael Edwards





                                       2
<PAGE>   3



                                   EXHIBIT A


<TABLE>
<CAPTION>
              Owner Paying                    Jurgen Epple        Michael Edwards          Total
              ------------                    ------------        ---------------          -----
<S>                                             <C>                   <C>                 <C>
Stephanie Lynn Karno Adult Trust #2             $ 6,480             $ 4,320               $10,800
Valerie Ann Karno Adult Trust #2                  6,480               4,320                10,800
Mitchell Perry Karno Adult Trust #2               6,480               4,320                10,800
         Subtotal - Karno Trusts                 19,440              12,960                32,400
Gerald  D. Ellenburg and Kristin Mary Tomczak    19,440              12,960                32,400
                                                -------             -------               -------                   
         Total                                  $38,880             $25,920               $64,800
                                                =======             =======               =======
</TABLE>







                                       3


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