regardless of whether or not a coupling is considered a termination or not, if you only use one strap every ten feet you are going to have a rather sloppy installation, not to mention flimsy if the run is horizontal. My rule of thumb is if you have a long horizontal run, attach to structure three feet in each direction of each coupling, hence, two straps per ten feet. It is solid, secure and appealing to the eye.
Jazer