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To get a good idea how antennas behave check out 4NEC2 an antenna modeling program. It can be downloaded from the net free. There are other programs as well like EZNEC that might be easier to start with. Start with a dipole that has been already designed and change the parameters to see how the radiation pattern, the feed point impedance and other characteristics change.
It is well worth the time to learn how to use a basic antenna modeling program and use it conjunction with the Nanovna. Antennas can be scaled down to make them easy to support and modify.
I have made antennas for 200 MHz or higher to make them compact. In one case I just taped it to a large piece of cardboard. With the Nanovna you can use it to drive the antenna with ch0 and monitor the radiation from it with ch1 using a small sniffing antenna. The sniffer can give you an idea of the pattern and polarization. Years ago I wanted to prove that a half square antenna actually was a vertical polarization radiator with its horizontal half wave of wire connecting the two verticals. In the far field it was perfectly vertically polarized. I also did the same with a discone and learned that it does have a polarization tilt at some frequencies (old radio shack version tested at 2 meters).