I don't think he has the picture and description up yet. Here's a link to the order page showing the price which is lower than anywhere else, as usual.
[Link: homeautomationnet.com]Here's a link to a description:
[Link: smarthome.com]It is not a coupler. It plugs into a socket on the circuit where you have a weak signal and boosts it in real time. This amazes me, but I confirmed with my Elk meter that it is indeed working in real time.
Note that the description points out that if there is no signal present, then the Boosterlinc is not going to boost anything. You have to have something already there for it to pick up. In my case, I had .3v which was operating my things pretty well, but I wanted a more solid signal so tried this. It worked.
I think this may be a very useful new problem solver along with the ACT filters. As I mentioned above, I'd eliminate things sucking the signal down first. Surge protectors are notorious signal killers unless they have a filter on the front end to isolate them.