This paper may be of interest.
https://people.eecs.berkeley.edu/~pister/290Q/Papers/Antennas%20propagation%20interference/near%20field%20path%20loss.pdf
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I will be showing an Xl Microwave XL Model 3401 Source Locking Millimeter Wave
Frequency Counter at Huntsville Ham fest .
It counts to 40 GHz and I have tested it to 20 GHz ( limit of my sig gen).
I have locked YIG’s to 11 GHz and verified HPIB operation. It comes with a 5
to 11 YIG with interna
The Prologix is very easy to use . I use it with Labview ($ 50.00 Home
edition) and have several vi's.
I have interfaced it with HP 3325A, HP 3405A , HP 3478A , WK 2400, XL
Microwave 3401 and several others.
You can use Termite(free) or GPIB Configurator ( free) to sent one liners
to test code.