Joe Carr, K4IPV (SK), wrote an extensive article, beginning on page 71 of the July, 1977 Ham Radio magazine, describing the many measurement devices that can be used with antenna installations. Although close to 50 years old, the techniques haven’t changed and designs for simple measurement instruments are given.
A copy of that article is provided by the link below (scroll down to page 71 after the publication opens).
The following instruments are described, with practical circuits:
RF Ammeters
RF Voltmeters
Wheatstone Bridge
The Noise Bridge
Antenna Impedance Meters
SWR Bridges
RF Wattmeters
These are all simple devices, easily within the average person’s ability to build, and practical circuits are provided.