  We describe a geometric model for synchrotron radiation from blazar jets,
involving multiple emission zones with turbulent magnetic fields and a
transient core with a helical B field. Including the effects of jet divergence,
particle cooling and the Relativistic PA rotation (RPAR) to the observer frame,
we find polarization behavior consistent with recent data from monitoring
campaigns. We predict that under some circumstances multi-$\pi$ rotation phases
should exhibit relativistically-induced steps in rate $d{\rm PA}/dt$ and
modulation in polarization $\Pi$ that can be helpful in pinning down the jet
$\Gamma$ and $\theta_{\rm obs}$. Also, RPAR enhances waveband differences that
will be particularly interesting for comparing radio, optical and, soon, X-ray
PA and $\Pi$ variations.
