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                       Federal Communications Commission

                               Enforcement Bureau

                              South Central Region

                                 Dallas Office

                          9330 LBJ Freeway, Suite 1170

                              Dallas, Texas 75243

                               November 17, 2009

   Walls Industries, Inc

   Cleburne, Texas

                      NOTICE OF UNLICENSED OPERATION  AND

                    INTERFERENCE TO LICENSED RADIO STATIONS

   Case Number: EB-09-DL-0087

   Document Number: W201032500002

   On September 24, 2009, the Commission's Dallas Office of the Enforcement
   Bureau received an interference complaint from AT&T Mobility ("AT&T") that
   an interfering signal was seriously degrading communications to an AT&T
   cellular radio site in Cleburne, Texas. An AT&T representative indicated
   that the source of interference was emanating from 1905 North Main St.,
   Cleburne, Texas.

   On October 27, 2009, in response to the interference complaint, agents
   from this office confirmed by direction finding techniques that radio
   signals, including those on frequency 825.035 MHz, were emanating from an
   antenna mounted on a tower at 1905 North Main St., Cleburne, Texas. After
   performing an inspection of the building located at that address, the
   agents observed that five bi-directional amplifiers ("BDA") or signal
   boosters were installed and operating in the building. During the
   inspection, all five units were disabled.

   AT&T has a license to provide cellular communications in the 824-849 and
   869-894 MHz bands. Section 22.383 of the Commission's Rules, which applies
   to public mobile service licensees like AT&T, provides that "[l]icensees
   may install in-building radiation systems without applying for
   authorization or notifying the FCC, provided that the locations of the
   in-building radiation systems are within the protected service area of the
   licensee's authorized transmitter(s) and on the same channel or channel
   block."  A licensee's authority to install a BDA does not permit a
   subscriber to install a BDA, unless that subscriber has received explicit
   authorization from the licensee to do so. AT&T reported that it did not
   provide you authorization to install a BDA.

   Operation of radio transmitting equipment without a valid FCC
   authorization or license is a violation of Section 301 of the
   Communications Act of 1934, as amended, and may subject the responsible
   parties to substantial monetary forfeitures, in rem arrest action against
   the offending radio equipment, and criminal sanctions including
   imprisonment. Because unlicensed operation creates a danger of
   interference to important radio communications services and may subject
   the operator to severe penalties, this warning emphasizes the importance
   of complying strictly with these legal requirements.

                     UNLICENSED OPERATION MUST NOT RESUME.

   You have ten (10) days from the date of this notice to respond with any
   evidence that you have authority to operate granted by the FCC or have
   obtained consent from a licensed Common Carrier. To resolve the issues
   with respect to your authority to operate this device, and pursuant to
   Section 403 of the Communications Act of 1934, as amended, provide an
   explanation as to what has been done to correct the interference issue and
   to ensure that it will not recur; provide any agreements made with any
   cellular carrier to operate the system and include any relevant documents.
   Identify the make, model and serial number of each piece of equipment
   including the antennas if applicable.

   Your response should be sent to the address in the letterhead and
   reference the listed case number. Under the Privacy Act of 1974, we are
   informing you that the Commission's staff will use all relevant material
   information before it to determine what, if any, enforcement action is
   required to ensure your compliance with FCC Rules. This will include any
   information that you disclose in your reply.

   FEDERAL COMMUNICATIONS COMMISSION

   James D. Wells

   District Director

   Dallas Office

   South Central Region

   Enforcement Bureau

   Attachments:

   Excerpts from the Communications Act of 1934, As Amended

   Enforcement Bureau, "Inspection Fact Sheet", March 2005

   Section 22.99 of the Rules defines a "signal booster" as a "stationary
   device that automatically reradiates signals from base transmitters
   without channel translation, for the purpose of improving the reliability
   of existing service by increasing the signal strength in dead spots." 47
   C.F.R. S: 22.99.

   Section 22.99 of the Commission's Rules defines "in-building radiation
   systems" as "[s]upplementary systems comprising low power transmitters,
   receivers, indoor antennas and/or leaky coaxial cable radiators, designed
   to improve service reliability inside buildings or structures located
   within the service areas of stations in the Public Mobile Services." 47
   C.F.R. S: 22.99.

   47 C.F.R. S: 22.383.

   47 U.S.C. S: 301.

   See 47 U.S.C. S:S: 401, 501, 503, 510.

   47 U.S.C. S: 403.

   5 U.S.C. S: 552a(e)(3).

   2