recently picked up a nanovna as well. I am having a lot of fun characterizing antennas and cables. suddenly it’s clear to me why this cheap 144mhz whip on my desk is only useful on a very narrow set of frequencies.
I live on a small remote island. Over the past number of years there has been a boom in heat-pumps here due to government subsidies. A local company appeared and was happy to fill the demand for new units. Eventually the new installs dried up and the company disappeared.
This winter there has been a number of desperate pleas on facebook for people seeking repairs on their heat pumps and split units. Unfortunately, the nearest company who can service these units is a half day ferry away.