A internal antenna with rotatable mounting bracket assembly is mounted on an edge of a flat panel television and has a mounting bracket, a clamp and a rotatable antenna seat. The mounting bracket is mounted on the edge of a flat panel television and has a mounting disk, a front jaw and a clamp socket. The clamp attaches to and holds the mounting bracket on the edge of a flat panel television and has an arm assembly and a rear jaw. The arm assembly is mounted slidably in the clamp socket and has a resilient element. The resilient element holds the clamp in the clamp socket. The rear jaw is formed on and protrudes down from the arm assembly. The rotatable antenna seat is mounted rotatably on the mounting bracket and has an antenna bracket. The antenna bracket clips the antenna and is formed on the disk.