The best method is to spam 5 pannels 1 pole and 1 radar station everyhwere in a pattern to get full coverage
It turns off every night for about 30 seconds but its really cheap and when biters attack it they only destroy the radar itself
they are so cheap that defending them really is never worth it

As soon as I mouseover the railsignal ghost next to me the game crashes. I can mouseover and replace the other signals around the station with no problems. No Mods. It was destroyed after upgrading to 0.10.10.
Savegame included:
https://www.dropbox.com/s/uhsmw8gp6h6ho ... h.zip?dl=0