Sometimes if you're doing scan missions, you'll get wing missions that pop up and tell you to disable the emplacement power grid - for some settlement patterns, there won't actually be a generator to disable and you have to scan a data point instead.
What doesn't help is that the beacon you need won't actually be highlighted as a target until you get within 50m of it.
The mission isn't busted - it can still be done, you just need to know where the beacon is. Here's an example of it being done on the +++ settlement with the comms dishes.
On this particular settlement pattern there are a couple of other locations - one is just outside the compound near the one scanned here (on the right hand side from the POV of my approach) and the other is on a cabin behind the big tower on the left hand side. For an individual settlement, it'll always be in the same place - so for this one, it'll always be the beacon I scanned. Another location will always be the one round the side, etc.
These settlements have a lot of turrets so it's not recommended to hang around - if the beacon you scan isn't the right one, get out of there quickly before the trespass timer elapses.
And yes, I am aware that I'm a clumsy oaf and smacked my wing off the tower. That's what shields are for.