The first problem with the post is, annoyingly, the door. You're not actually authorized to go inside, and there's only one entrance into the post itself, and it's monitored by multiple cameras. You'll need to figure out a way to get the door open (or get it opened for you) to get into the post itself.

Naturally. Hmmm. I'll reach out to one of the signal analysts saying I'm very interested in signals countertelligence and considering a career change, see if they can't get me an interview, at least get me in the door. If that doesn't work...Fake credentials and facial appliances to make me look like a new trainee, I suppose.

The second problem is the Regional Director of Internal Security, Captain Usanako. They've thwarted dozens of coup plots before, and they'll continue thwarting them if they're not restrained somehow. They're unshakably loyal, and they need to be gotten rid of. They don't necessarily need to be killed, they just need to be out of the way until the coup has actually happened. A few weeks without contact with the government minimum, or at least without being taken seriously. If they must die today, it needs to be relatively unsuspicious, Sendri trusts the Captain and will investigate their death if they should end up dead in an obviously suspicious manner. So how are you going handle them?

Some inspiration from my cousin's pursuits, I suppose. Bioterrorism, you might call it? I'll bring along a virus with me that won't kill them, but will make it so they're just out of the way and in the hospital for a few... weeks, perhaps.

The third problem is the post itself. It's constantly receiving signals and updates from around the region, and it's heavily guarded, and more to the point, the guards are very loyal and very skilled. Shutting down the arrays temporarily will be tricky, but there must be a way to damage the post such that it can easily be repaired while still buying us a few weeks of it being inactive. How shall you do that?

Better to do it without being seen to have done it, yes? Spread some bird food near the arrays to attract a large colony of birds. With a mini drone, perhaps. The birds will poop and nest on the arrays, the guano interfering with their operation. If they get the birds under control, I'll have to spread more bird food. When we want to use it, we just have to stop putting out food, finally shoo of the birds and clean off the bird guano. ...Ugh, I suppose with using animals I'm still taking inspiration from my cousin Frankie, aren't I?

The fourth problem is the Independence Front of the Outer Sector. They've been opposed to Alliance rule for years, and if they see weakness at Kirachi Beach, they'll swoop in and destroy the listening post utterly. You're going to have to prevent them from destroying it further than you already have. So what's the battle plan?

Spread a rumor that the 'issue' at the listening post is a ruse to draw the Independence Front out and cut them off when they go for an actually-well-protected listening post. Very efficient.