During live outside broadcasting (OB) of road races, such as marathons and ekiden, video images are taken using cameras on moving OB vans and the signals of the video images are transmitted by FPU in 700 MHz band. The frequency band for the FPU is planned to migrate to 1.2 and 2.3GHz bands by the action plan for radio spectrum reallocation developed by the ministry of internal affairs and communications. After the frequency migration of FPU, the transmission frequency-band will be higher than that of 700MHz band; however, few studies have been performed concerning the effect of OB van on the radiation patterns due to the shape of the OB van. In this report, we designed transmission antennas and OB van and calculated radiation patterns. From the results, we found that the antenna height is the significant parameter for the radiation pattern on the OB van.
