Let me give you some advice, just don't. Back when I actually tried to play Fallout 4, the Settlement system was one of the most irritating things imaginable. First of all, there's been a glitch since launch day where, if you leave your settlement for too long, for some reason the "bed" counter will drop to 0, even if you've put like 20 viable beds down in a single settlement.
Second of all, even if you don't set up a radio broadcast, people from all over will still show up to your new towns, and you'll have to constantly provide food, shelter, water, and defense for all of them. On top of that, your settlements will randomly be attacked, most of the time when you're nowhere near them and in the middle of something else, and you'll have to fast travel there to defend the settlement or else every single person in it will die because they're incompetent AI.
It's a shitton of micromanaging, especially if you decided to get the Minutemen Ending, which requires you having unlocked like 30 settlements. It's just better off ignoring the settlement system entirely, trust me, or every few minutes you're going to be picking up junk to use to make stuff for your dozens of settlements, or you'll have to fast travel in the middle of a mission to protect them, or they'll glitch out and you'll have to teleport there to reset your counters, etc etc etc.