What's the 65GHz Transmission Loss with a 2 meter‘s free space using two horn antennas?

What's the Transmission Loss or Fading if we insert two horn antennas with 2 meters distance into the 65GHz signal path? The test uses two 23dBi gain pyramid horn antennas. It tells you the signal attenuation for a 65GHz signal after being transmitted through a 2 meters' free space.

[@MadShaman1]

Cool setup!

[@hawldydemolab949]

Thanks! Some pics on Linkedin: www.linkedin.com/posts/hawldy-zhao-a82406164_generator-mmw-thz-activity-7148573456958205953-hkye?