Point to point network. Fun fact, you can invert an old satellite dish and mount a wifi antenna in place of the LNB and shoot your wifi for a mile or two this way. Back when high speed internet was still rare, hobbyists practiced different ways to extend networks to poorly covered areas. This was one of those ways. Then fiber was run across the country and everyone got their hopes up... to see the telcos say "out of money, sorry, keep using our dsl until we get more handouts to install the last mile."

It's for calling in supplies

That's the antenna for a wireless network bridge to another building.

Definitely a roof.

looks like a point to point wireless networking device.

like this: https://docs.tomesh.net/network/supernode4.html

Probably point to point WiFi, either for an office in LoS or for a wISP.

If they're super progressive they might also be letting some hobbyists put a LoRA rig up there.

What's it pointing at? That is a directional antenna. So it's trying to talk to something in that direction (either sending or receiving or both).

Edit: Note that the answer to what it's pointing at night be vague like "a city". Imagine a walkie talkie with a directional antenna. It doesn't need to be pointed directly at who you're talking to, just the general area would be fine.

It’s what they use to track people who got the Covid vaccine. /s

Long range wifi dish look similar.

Whats ominous about a communications dish?

Def not a ubiquiti antenna

Looks like microwave wifi.

Þe comforting þing about dishes is, if þey aren't pointed in your direction, it probably has noþing to do wiþ you, and can probably not (directly) affect you.