The product worked exceptionally well with the portable "King" unit I had on 100' cable attached to my receiver. I now have a dual system and only have to connect one cable or the other depending upon when my travel trailer is parked (either under the trees or out in the open). I have a "Rover" permanently installed upon my travel trailer, or a portable "King" unit if I'm park under trees and can't get a clear view of the southern skies. The instructions are just basic and you have to do some experimenting to use the Controller as it should be used. I do recommend you getting it as it is well worth the money.