Antenna switch 3:1 for HF 1kW

For my ham radio use I need to switch more antenna to one output cable. This project show one from more possibility how to do it. All three input are connected to ground if are not use and when is one from this three input connected to output then is connected thru relay. I used relays with two 8A contacts from Finder series 40.52, but is not important (I bought this for good price).

Few pictures for motivation



Top side



Bottom side


Side view