Not close enough to effect the tuning, antennas will be up in the air,
i can see on the laptop if me moving around changes the readings,
its not scientific, nor are the tests any cb antenna maker i ever came across does,
what i am doing reflects what people will typically do with their antennas expecting to see the gains claimed in the advertising,
i have had a few suggestions on how a test should be conducted including dummy antennas to absorb ground reflections,
im sure there are much better methods using better equipment out in the middle of nowhere in flatland but none of that was done with the Vortex tests,
no mast isolation & i see no choke in the test setup,
my test is to find out if what Vortex say is true,
i will also test isolated from mast & choke the coax because that's how i use my antennas.