Ok, thanks, so to allow me to reach other planets, I just need few good antenna (2 should be good as there will alway one antenna in contact with the vessel) orbiting just over my relay system and i'm good.
so the vessel communicate with the good antenna wich then use the relay system of my 5 probes (if ksc isn't reachable directly)
sorry for all those doubt, but I always used manne vessels, and now I want to improve the gameplay using relays systems.