This is not actually a quest, just something you can do. Everything on the page is accurate and there's really not much more to add. It does not update your journal.
The distress signal did not go away for me after turning off the ham radio. I made sure to not be tuned to the radio signal on my pip boy when I turned it off.
The bug is definitely NOT fixed as of the survival patch (1.5 whatever. Non beta). 22.214.171.124 17:31, April 28, 2016 (UTC)Frank.O