Merry Christmas and a Happy New Year!

I am curious about the setup of measuring the input impedance of an
antenna. Is there any standard setup for this? What equipments are use?
Any pictures of a an example setup configuration?

I was talking to friend and I told him that you can probably use a
vector analyzer to measure the input impedance at a certain frequency
sweep. But I came to thinking that objects / persons around the antenna
during measurement would affect its impedance due to stray capacitance.
This is strictly referring to the vector analyzer fixed in a school lab
setting.

Any additional info would be greatly appreciated.

Thanks!