For antenna fieldstrength measurements to measure the actual antenna gain and radiation pattern by using a nanovna for rf source to the test antenna and tsa ultra with a hb9cv antenna to measure the fieldstrength, accurate enough for portable and independent of long cables which may influence the reading.
Zero span is useful for quick indication of the fieldstrength while holding the ultra and antenna to confirm radiation pattern etc, it just needs to be out of the direct sunlight in the early evening.
And to check local repeaters output and sensitivity with a "reference antenna" which is basically any antenna which is fixed in it's position.
Then writing the repeaters signal strength down in a small book to be used if a repeater has a problem.
The signals are normally very stable over many years and by comparing the notes in the book you can establish if it is the repeater or your reference antenna
has changed in comparison with other repeaters, if all repeaters are lower than before it's your antenna for instance.
This is also done commercially and with good reason as it verifies the quality of the installation under test.
Just be aware of antenna coupling to transmitters when using spectrum analyzers like the tiny, i let others do the keying up of the repeaters!
