NO!!!! The optimum length for a single antenna installation is the shorest distance possible.
Originally Posted by RangerJustin
I have read about coax needing to be a certain length to achieve best signal. Any truths to this?
Period. End of story. That whole "optimum 18ft" thing is a myth perported by "experts" who heard from other "experts" and passed on by people who believed those "experts" for the last 40 something years. It is crap.
Avoid sharp bends that kinck the coax. Avoid loops and coils. Leave yourself about a foot of slack on the radio end so you can move it around and work. And you should leave yourself about a foot of slack on the other end too so you have some wiggle room and incase you need to replace the connections down the road.