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@karthikeyan's excellent answer links to The Rotation and Interior Structure Experiment on the InSight Mission to Mars (Folkner, W.M., Dehant, V., Le Maistre, S. et al. Space Sci Rev (2018) 214: 100. https://doi.org/10.1007/s11214-018-0530-5), and includes this image from there.

Question: Are there any preliminary results from Mars lander InSight's RISE antennas? Have they been at least tested yet? If so, what did they transmit and/or receive?

Mars InSight lander's RISE antennas

Related: 3D celestial puzzler; why InSight's two RISE horns point slightly south of east, and north of west?

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The paper "Initial results from the InSight mission on Mars" published on 24 February 2020 in the journal Nature Geoscience states

HP$^3$ and RISE have not yet collected sufficient data for meaningful analysis; thus their results will not be discussed here.

The webpage for RISE does not report any problems with that instrument. In contrast, NASA has been very open about the problems with HP$^3$.

It therefore seems that RISE is functional, but there simply isn't enough data to draw any meaningful conclusions.

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