Oggie Lee Johnson, N4WYE, sent this link to a manual for how to use the NanoVNA. You can use the NanoVNA as an antenna analyzer.
Click here for the manual. Note that this will take you away from this website. Use your browser’s back button to return here.
The NanoVNA is available from many sources. One, interestingly, is Walmart. Here’s a link to purchase the VNA from them. As of this writing, the price is $47.25.