Contest winning contester here., SWR makes you stupid. I never bothered trying to reach 1:1.0 and in fact I ran SWRs 10,20,30 or more times that at the antenna feedpoint using wire antennas multiband. Modelling my inverted L antenna fed by a SGC230 that was 85:1 SWR at its highest on one band, it could hear a gnat fart on the other side of the world, didn't stop me working the world, being told I was the loudest station in Europe on 40m during a contest where I was running a frequency with just 100W.
As long as it was below 1.6:1 for transmitting, enough to keep the transistors in the PA happy (which is what the SGC matched it to), it was good to go and on valve gear I'd push it to 3;1. You'll notice no difference in receive or transmit by getting lower than that.
Right now thats over back to the analyser.
First point is you need to be connected to the antenna as near to the feedpoint as possible so that means using as short a length of coax as you can. If you can't do that you need to ideally be using an ELECTRICAL half wavelength of coax as the end of that will give you figures the same as the antenna end.
You want to be looking at TWO different sets of figures.
First you need to look at is what the feedpoint impedance (Ohms) is when Z=0 so scan around the results until you find where Z is the lowest or nearest to zero and read out the Ohms. That will tell you how efficient your ground plane is. A quarter wave over a perfect ground has a feedpoint impedance of 36.8 Ohms at resonance (where Z=0). The further away from that the more ground losses you have.
Second one is your SWR. The SWR dip will be in a different place to where the Z dip is. You want this to be below 1.6/1.7:1 on a CB and ideally you'd see 50 Ohms at that point but if you're using the coax that came with the mount you may see a reading different than that due to the effect of the coax..
