Communication in dense urban area has consistently attracted significant attention from both academia and industry. It is an essential component for the related wireless communication system by measuring and analyzing wireless channel across various frequency bands. Measuring and analyzing wireless channel in dense urban environments is far more complex and poses significant challenges. Therefore, we conducted measurements and analyzed the channel characteristics of vehicle-to-infrastructure (V2I) communication channel. This paper presents the measurement activities of channels in dense urban environments and compares key channel characteristics under different link conditions, such as power path loss (PL). We researched the Rician power delay profile (PDP) under different channel bandwidths, and Rician K-factor at different carrier frequencies ranging from 0.69 to 5.9 GHz, and also conducted extensive analysis of the characteristics of shadow fading (SF). Additionally, a statistical analysis of the decorrelation distance of SF was also performed, that as the channel bandwidth increases, the decorrelation distance also increases.