Development and commercialization of a satellite receiver and active antenna to utilize the combined broadcasting and communication tracking feature of the Koreasat III (Mugungwha III) in mobile environment has paved the way for mobile multicasting business. This service allows customers enjoy various multimedia/broadcasting services anywhere, anytime, which have been available to fixed locations such as public broadcasting or cable television and satellite broadcasting services until this time. This services will furnish advertising agencies with new business opportunities since it can increase the exposure of advertisements to the general public dramatically with relatively low cost, especially in such highly populated places as public buses, trans, etc. Also many other industrial sectors such as stellite service providers, advertising agencies/sponsors, manufactures (antennas/satellite receivers), etc., will be benefited by the spread of this service. Currently KT is providing a trial service in the Seoul-Incheon airport limousine bus line in cooperation with an advertising agency and manufacturers.