Exemplary embodiments are disclosed of multiband vehicular antenna assemblies with Global Navigation Satellite System (GNSS) capabilities. In exemplary embodiments, a multiband antenna assembly is operable with more than two satellite navigation system frequencies (e.g., Global Positioning System (GPS), BeiDou Navigation Satellite System (BDS), the Russian Global Navigation Satellite System (GLONASS), etc.). For example, a multiband antenna assembly may include a first patch antenna operable with at least three different satellite navigation system frequencies, e.g., GPS, BeiDou, and GLONASS, etc. The first patch antenna may be stacked on a second patch antenna. The second patch antenna may be operable with other frequencies, such as Satellite Digital Audio Radio Services (SDARS) signals (e.g., Sirius XM, etc.). The antenna assembly may also include a coupler that couples the signals from the feed ports of the first patch antenna.