Regarding what vsat said about weedeaters, I used to do commercial lawns, and the only way a weedeater would ruin a coax (other than sitting there trying to eat through the insulation on purpose), is if the coax gets wrapped around the head of the eater (commercial landscapers use commercial eaters, which usually either have no guard, or we would remove the guard that home type eaters would leave on, with the guard on it makes the coax wrap harder), even then, the person operating the weedeater would have to pull his ass off to break the coax (we would carefully unwrap it from the heads when this happened, which was often, a good way to prevent this, is to make sure you have no slack in the coax, and if any at the entry point, staple the hell out of it), although it is possible in that scenario to damage the insides of the coax, for cabletv, not a huge deal, but for satellite, small damage could make a difference.
Wrt landscaping equipment, the real danger for coax, is when the coax runs under a walk/driveway/tree wall, or other area where an edger might go, a steel edger blade will _definatly_ take out a coax, which is one of the reasons most landscape companies use a weedeater (tilted) to edge, instead of a blade-edger.