  We analyse the clustering of the Sloan Digital Sky Survey IV extended Baryon
Oscillation Spectroscopic Survey Data Release 16 luminous red galaxy sample
(DR16 eBOSS LRG) in combination with the high redshift tail of the Sloan
Digital Sky Survey III Baryon Oscillation Spectroscopic Survey Data Release 12
(DR12 BOSS CMASS). We measure the redshift space distortions (RSD) and also
extract the longitudinal and transverse baryonic acoustic oscillation (BAO)
scale from the anisotropic power spectrum signal inferred from 377,458 galaxies
between redshifts 0.6 and 1.0, with effective redshift of $z_{\rm eff}=0.698$
and effective comoving volume of $2.72\,{\rm Gpc}^3$. After applying
reconstruction we measure the BAO scale and infer $D_H(z_{\rm eff})/r_{\rm
drag} = 19.30\pm 0.56$ and $D_M(z_{\rm eff})/r_{\rm drag} =17.86 \pm 0.37$.
When we perform a redshift space distortions analysis on the pre-reconstructed
catalogue on the monopole, quadrupole and hexadecapole we find, $D_H(z_{\rm
eff})/r_{\rm drag} = 20.18\pm 0.78$, $D_M(z_{\rm eff})/r_{\rm drag} =17.49 \pm
0.52$ and $f\sigma_8(z_{\rm eff})=0.454\pm0.046$. We combine both sets of
results along with the measurements in configuration space of \cite{LRG_corr}
and report the following consensus values: $D_H(z_{\rm eff})/r_{\rm drag} =
19.77\pm 0.47$, $D_M(z_{\rm eff})/r_{\rm drag} = 17.65\pm 0.30$ and
$f\sigma_8(z_{\rm eff})=0.473\pm 0.044$, which are in full agreement with the
standard $\Lambda$CDM and GR predictions. These results represent the most
precise measurements within the redshift range $0.6\leq z \leq 1.0$ and are the
culmination of more than 8 years of SDSS observations.
