Here is a cheaper way of getting good results.
A Noise Bridge is often advertised used at about $30 for a PALAMAR unit or about $70 from MFJ.
Build a """"flat""" 50 ohm load as a reference piece of test gear.
Connect the Bridge to your receiver and the antenna port to the flat load.
Adjust both dials for min to no noise in the receiver.
Look at the two dials.
The R dial should read 50, the Z dial close to zero or center position indicating the load is flat, 50 ohms and purely resistive with no reactance either way, Z C/L.
Then sub the antenna for your Load and play with the dials for lowest noise in the receiver.
What you read on the dials tells you what the antenna impedance is likely to be.
You make adjustment to the set up until you get as close as you can get to 50 and center the dial for the noise null.
Center dial is the point between capacitive reactance and inductive reactance.
Afterwards put your SWR meter in line as you normally would do and check what it says as a cross reference but keep in mind insturment accuracy and tolerences.
The flat load test of the SWR meter should also show no reflected power in an actual power test. This is why the flat load is a reference for you and testing to see who's 'lying' at times and who is out of adjustment or faulty..
For a lot less than $260 you can accomplish the same thing and learn a great deal.
The Bridge puts out wide band noise into a bridge circuit whos 'null' is at the impedeance the antenna port sees.
Never put transmitt power from the radio into the noise bridge or it burns it out.
This method tells you essentially the same thing as a 259 but a different way and cheaper..
Good luck.
