Backstay adjustment with SSB antenna and radar dome

[thor]

I have recently acquired a Pacific Seacraft 34 that is sloop rigged with a removable solent stay. The back stay has an SSB antenna incorporated as well as a post for the radar dome attached. Not sure how I can measure the tension of wire or how to tell if it has proper tension on the jib stay. Also not sure how much tension the solent stay should have when I have it rigged up. The mast is straight up and both the upper and lower shrouds are pretty set with a dockside tune (~14% of 1/4" breaking for the uppers, ~12% for lowers). Are there any best practices for this type of setup? --thor