Hi Larry,
Yes, I've used that page from Tom. It is more complicated that the NanoVNA for sure....He was an MFJ contract employee for years but stepped away just a few years ago. I used his guide to create a false RF ground in my 2nd floor shack when building our house 9 years ago. His site has a lot of theoretically sound and practical info! Take a look at his antenna farm via Google Earth. Local broadcast stations in Barnesville GA are envious, LOL.
73,
Frank
K4FMH
K4FMH