  We present a microwave study of the angular dependence of the flux-flow
resistivity $\rho_{ff}$ and of the pinning constant $k_p$ in YBCO thin films
containing BZO nanorods. We find that BZO nanorods are very efficient pinning
centers, even in tilted fields. We find that $\rho_{ff}$ is a scaling function
of a reduced field $H/f(\theta)$. We extend a model for the anisotropic motion
of vortices in uniaxially anisotropic superconductor, able to describe the
experimental $f(\theta)$ on the basis of only the intrinsic anisotropy of YBCO.
The pinning constant $k_p$, by contrast, exhibits different field dependences
in different angular ranges, consistent with pinning by BZO at angles as large
as 60$^{\circ}$, and with pinning along the $a,b$ planes as originating from
the same mechanism as in pure YBCO with the field along the c axis.
