The NanoVNA is a nice tool to analyze your antenna impendance for example (SWR) Here is a nice video how to use it. It helps me a lot! https://pd2tx.com/wp-content/uploads/2022/01/NanoVNA-a-50-70-Amateur-Radio-Antenna-Analyzer_.mp4 You can get this analyzer via AliExpress for €50 via: NanoVNA Post navigation Mini Yagi 70cm antenna Using CatSync
