1 EXHIBIT 4.1 LAMAR MEDIA CORP. SUPPLEMENTAL INDENTURE THIS SUPPLEMENTAL INDENTURE dated as of July 20, 1999, is delivered pursuant to Section 5.01 of the Indenture dated as of November 15, 1996 (as heretofore or hereafter modified and supplemented and in effect from time to time, (the "1996 Indenture") among LAMAR ADVERTISING COMPANY. ("the Company"), a Delaware corporation, certain of its subsidiaries ("Guarantors") and STATE STREET BANK & TRUST COMPANY, a trust company organized under the laws of the Commonwealth of Massachusetts, as Trustee ("Trustee") (all terms used herein without definition having the meanings ascribed to them in the 1996 Indenture). The undersigned hereby agrees that: 1. Lamar Advertising Company has caused Lamar Holdings Merge Co. to merge into Lamar Advertising Company under the laws of the State of Delaware ("Merger") and incident thereto caused the name of Lamar Advertising Company to be changed to Lamar Media Corp. 2. Lamar Media Corp., being the Surviving Entity under the Merger as provided under the 1996 Indenture, continues to be a corporation organized and existing under the laws of the State of Delaware. 3. The Surviving Entity ratifies and confirms its obligations as the "Company" under the 1996 Indenture and the securities issued thereunder. 4. Lamar Media Corp. hereby represents and warrants that the representations and warranties set forth in the 1996 Indenture as amended by this Supplemental Indenture are correct on and as of the date hereof. 5. The Guarantors of the Indenture, being the subsidiaries of the Surviving Entities listed below, hereby confirm and ratify their Guarantees of the 1996 Indenture and the Securities issued thereunder and acknowledge that their Guarantees will continue to apply to the obligations of the Company under the 1996 Indenture. 6. All notices, requests and other communications provided for in the 1996 Indenture should be delivered to the respective parties hereto at the following address: 1 2 Lamar Media Corp. Attn: Mr. Keith A. Istre Vice President - Finance P.O. Box 66338 Baton Rouge, LA 70896 7. A counterpart of this Supplemental Indenture may be attached to any counterpart of the 1996 Indenture. 8. This Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York. IN WITNESS WHEREOF, the undersigned has caused this Supplemental Indenture to be duly executed as of the day and year first above written. Guarantors: LAMAR MEDIA CORP. INTERSTATE LOGOS, INC. THE LAMAR CORPORATION LAMAR ADVERTISING OF MOBILE, INC. LAMAR ADVERTISING OF COLORADO SPRINGS, INC. LAMAR ADVERTISING OF SOUTH MISSISSIPPI, INC. LAMAR ADVERTISING OF JACKSON, INC. LAMAR TEXAS GENERAL PARTNER, INC. LAMAR ADVERTISING OF SOUTH GEORGIA, INC. TLC PROPERTIES, INC. TLC PROPERTIES, II, INC. LAMAR PENSACOLA TRANSIT, INC. LAMAR ADVERTISING OF YOUNGSTOWN, INC. NEBRASKA LOGOS, INC. OKLAHOMA LOGO SIGNS, INC. MISSOURI LOGOS, INC. OHIO LOGOS, INC. UTAH LOGOS, INC. TEXAS LOGOS, INC. MISSISSIPPI LOGOS, INC. GEORGIA LOGOS, INC. SOUTH CAROLINA LOGOS, INC. VIRGINIA LOGOS, INC. MINNESOTA LOGOS, INC. MICHIGAN LOGOS, INC. NEW JERSEY LOGOS, INC. 2 3 FLORIDA LOGOS, INC. KENTUCKY LOGOS, INC. NEVADA LOGOS, INC. TENNESSEE LOGOS, INC. KANSAS LOGOS, INC. COLORADO LOGOS, INC. NEW MEXICO LOGOS, INC. LAMAR ADVERTISING OF HUNTINGTON- BRIDGEPORT, INC. LAMAR ADVERTISING OF PENN, INC. LAMAR ADVERTISING OF MISSOURI, INC. LAMAR ADVERTISING OF MICHIGAN, INC. LAMAR ELECTRICAL, INC. LAMAR ADVERTISING OF SOUTH DAKOTA, INC. LAMAR ADVERTISING OF WEST VIRGINIA, INC. LAMAR ADVERTISING OF ASHLAND, INC. AMERICAN SIGNS, INC. LAMAR OCI NORTH CORPORATION LAMAR OCI SOUTH CORPORATION LAMAR ADVERTISING OF GREENVILLE, INC. LAMAR ROBINSON, INC. LAMAR ADVERTISING OF KENTUCKY, INC. LAMAR ADVERTISING OF ROLAND, INC. By: /s/ Keith Istre ------------------------------------------ Keith Istre, Vice President - Financial 3 4 LAMAR TEXAS LIMITED PARTNERSHIP By Lamar Texas General Partner, Inc. Its general partner By: /s/ Keith Istre ------------------------------------------ Keith Istre, Vice-President-Financial LAMAR TENNESSEE, L.L.C. By The Lamar Corporation, its manager By: /s/ Keith Istre ------------------------------------------ Keith Istre, Vice-President-Financial LAMAR AIR, L.L.C. By The Lamar Corporation, its manager By: /s/ Keith Istre ------------------------------------------ Keith Istre, Vice-President-Financial TLC PROPERTIES, L.L.C. By TLC Properties, Inc., its manager By: /s/ Keith Istre ------------------------------------------ Keith Istre, Vice-President-Financial Attest: By: /s/ James McIlwain ------------------------------------------ James McIlwain, Secretary Accepted: STATE STREET BANK & TRUST COMPANY, as Trustee By: /s/ Andrew Sinasky ------------------------------------------ Title: Assistant Vice President --------------------------------------- 4