We are developing a millimeter-wave mobile camera that wirelessly transmits 100 Mbps class High-definition TV (HDTV) video at low compression and with low latency. To realize an uninterrupted wireless transmission while maintaining a high transmission rate, we are investigating the application of multiple-input multiple-output (MIMO) multiplexed transmission technique and millimeter-wave band that enable the use of wide bandwidth. In this article, with the aim of enabling this camera to operate in outdoor line-of-sight (LOS) environments, we performed an evaluation of cross polarized MIMO multiplexed transmission with a horizontally/vertically polarized omni antenna using a film polarizer. As a result, we were able to suppress the transmit correlation between MIMO propagation channels to 0.45 or less, and we achieved a substantial improvement in bit error rate (BER) performance (median value reduced to about 1/30 or less). On the other hand, we have confirmed that the range within which uninterrupted wireless transmission is possible becomes smaller due to the reduction in received power in cross polarization, and we have clarified the cross polarization power ratio (XPR) suitable for LOS transmission environments.