Triming tuning 320 meter loop aim4170, AG6IF DM09fg 

So, I'm trimming my big skyloop to get the first resonant point somwhere in the 1.8-2.0 mhz range.
The calculations were done for copper, and I am using Aluminum, which has a substantially slower velocity factor (7-8%), which makes the wire shorter, for the same resonance.
I am comparing a sweep before and after shortening the antenna about 22 feet.
Still more to go.. 73 from DM09FG , AG6IF JIm in Dayton NV