Are you saying they told you up to 600 ft is ok w RG-6?

We typically get up to about 200 feet with standard RG-6, and then start looking ot RG11. Will it WORK on longer runs? Yes, and we have stretched it at times. The new DP and DP+ from Dish Netowrk help stretch those lengths as well, but I certainly would not try 600 feet, nor have I ever. Even with your earlier post of 300ft references, I would probably be considering RG11. We've typically unsed in-line amps when doing runs that long when RG11 wasnt used.