What's the best way to test and compare antennas?

It is an honour to meet you, your videos taught me so much about LORA and all things RF, Thanks for telling all makers to get a VNA even if it is a Nano, Yet to get my T beams, they should be here by next week while I wait, practising how to make 433mhz antennas of varying types and figuring out how to tune them, So far I have made 1 433mhz Folded end Dipole, please look at my readings and tell me what you think. Please see Finally got me a VNA (noobie)