I know firestik recommends multiples of 18 feet
so for my situation it should be 54 feet to a rooftop antenna
per their suggestion. will only 40 feet be okay???

This is the stuff I plan on using 40 feet of for my Solarcon A-99 No Ground Plane
and will be Running Barefoot!!!
http://www.showmecables.com/product/...-Per-Foot.aspx
1.) Will my SWR suffer like firestik claims?
2.) Running Barefoot it's note horibbly important
to ground coax Just unplug in a storm to save radio correct???