Sam has a plan in order to take out Hoyt once and for all, but you must do a few things first. The first thing he wants done is to take out the communications center, so fast travel to Charlie Camp and head southwest. Once you arrive at the designated spot, you'll notice a red area around the comms center. This is a restricted area and the Privateers will attack ANYONE they see within that red area.
There are quite a few enemies in the area, including two snipers in towers, as well as two Heavies guarding the door you need to blow up with C4. It definitely helps to have a sniper rifle with a suppressor attachment, if only to take out the two snipers in the towers. It is very challenging to do this with all stealth, so once you take out the snipers, start going after the normal enemies.
You'll likely have one of the enemies set off an alarm, so shoot the one farther from the door you need to blow up, then try and get the other one, which is closer to the door. Once all of the normal enemies, as well as the snipers, are down, it's time to go after the Heavies. Sometimes they reset, and if you have the Heavy Beatdown skill, you should be able to sneak up behind them and stealthily kill them. Otherwise, you're going to need Grenades, Molotovs, or something else explosive or with flames.
With all of enemies now gone, go up to the door and plant a C4 charge. Take some cover behind something and detonate it to blast it open. When you go into the first room, you'll encounter some normal enemies and a Heavy with a Flamethrower. Keep going through the rooms, killing the enemies (more Heavies with Flamethrowers) until you go through a hallway. When you go through the door, some explosive barrels will roll down the stairs, so be careful.
Go up the ladder to get to the top outside area, where you'll find more enemies and the satellite dish. There's a tower behind you, with a sniper in it, as well as a dog and some normal enemies in your way. Go up to the satellite dish and plant the explosives. You now have to wait until Sam comes to pick you up, while facing some enemies that will come your way. If they make it to the dish, they will attempt to remove the C4, which will trigger a countdown. Once Sam comes, rush to the helicopter and when you get to detonate the C4, do so to finish the mission.
