On February 18, 2021 I used my SDR# (Software Defined Radio) software to pick up the Perseverance orbiter radio beacon signal when the Perseverance lander was landing on Mars. As a HAM radio operator, I have do have some experience in SDR, as I usually use it to pick up and record NOAA weather satellite signals, decode them, and then generate weather images. Here is the signal as recorded live. The antenna was an M2 satellite antenna on the roof. http://tek1systems.com/vid/MarsPerseveranceOrbiter/VID20210218_132426.mp4
https://www.facebook.com/groups/BackyardAstronomy/permalink/2562829904014818/
NASA Mars Perseverance probe frequency log Feb 18 2021:
Relay orbiter Freq 437.512.500
Orbiter beacon freq detected on 437.516.100 – blip every 20 sec. (DSB on SDR#)