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|SWR is basically a way of testing the impedance of your Antenna System. The Antenna System is two parts.
1. Coax and connectors.
Before you can test or tune the Antenna, you have to test the other 1/2 of the system first, the Coax & Connectors.
To test the Coax you will need a 50 ohm Dummy Load and an SWR Meter or Antenna Analyzer.
Note: Some of the MFJ 269 Analyzers does not work right. - - (eHam reviews on the MFJ269) - - The MJF 259B works Great.
Connect the Dummy Load to the end of the coax instead of the Antenna. Connect SWR Meter or Antenna Analyzer to the other end.
Important: Some Coax can test fine on VHF but not at UHF.
Also a known problem with some remote Antenna Switches.
Example from eHam Reviews
I have had my 269 for abt 5 years. It works ok. On VHF and HF it is dead on. But on UHF I do not trust it. I also have a Bird and I compared several antennas tuned with the 269 and the Bird and the 269 was wrong everytime on the UHF side. I killed one UHF final when I relied on the 269 for tuning. This antenna was checked with the Bird after the finals died and was found to have an SWR of 5:1+. Yet when checked with the 269 it showed fine. I now use the Bird for everything but HF tuning. The 269 still seems to work ok i this range and is nice for tuning my Buddy Pole for portable ops. It will never see VHF or UHF antennas again.